| 1250 | * Check If It Is a Good Array | 46% | Hard | |
| 1249 | * Minimum Remove to Make Valid Parentheses | 55% | Medium | |
| 1248 | * Count Number of Nice Subarrays | 50% | Medium | |
| 1247 | * Minimum Swaps to Make Strings Equal | 56% | Medium | |
| 1240 | * Tiling a Rectangle with the Fewest Squares | 48% | Hard | |
| 1239 | * Maximum Length of a Concatenated String with Unique Characters | 40% | Medium | |
| 1238 | * Circular Permutation in Binary Representation | 57% | Medium | |
| 1237 | * Find Positive Integer Solution for a Given Equation | 65% | Easy | |
| 1235 | * Maximum Profit in Job Scheduling | 44% | Hard | |
| 1234 | * Replace the Substring for Balanced String | 29% | Medium | |
| 1233 | * Remove Sub-Folders from the Filesystem | 53% | Medium | |
| 1232 | * Check If It Is a Straight Line | 47% | Easy | |
| 1227 | * Airplane Seat Assignment Probability | 61% | Medium | |
| 1224 | * Maximum Equal Frequency | 31% | Hard | |
| 1223 | * Dice Roll Simulation | 42% | Medium | |
| 1222 | * Queens That Can Attack the King | 68% | Medium | |
| 1221 | Split a String in Balanced Strings | 78% | Easy | |
| 1220 | * Count Vowels Permutation | 51% | Hard | |
| 1219 | * Path with Maximum Gold | 61% | Medium | |
| 1218 | * Longest Arithmetic Subsequence of Given Difference | 38% | Medium | |
| 1217 | Play with Chips | 63% | Easy | |
| 1210 | * Minimum Moves to Reach Target with Rotations | 43% | Hard | |
| 1209 | * Remove All Adjacent Duplicates in String II | 57% | Medium | |
| 1208 | * Get Equal Substrings Within Budget | 36% | Medium | |
| 1207 | Unique Number of Occurrences | 72% | Easy | |
| 1206 | * Design Skiplist | 60% | Hard | |
| 1203 | * Sort Items by Groups Respecting Dependencies | 45% | Hard | |
| 1202 | Smallest String With Swaps | 41% | Medium | |
| 1201 | * Ugly Number III | 24% | Medium | |
| 1200 | Minimum Absolute Difference | 66% | Easy | |
| 1192 | * Critical Connections in a Network | 47% | Hard | |
| 1191 | * K-Concatenation Maximum Sum | 24% | Medium | |
| 1190 | Reverse Substrings Between Each Pair of Parentheses | 57% | Medium | ❤ |
| 1189 | Maximum Number of Balloons | 61% | Easy | |
| 1187 | * Make Array Strictly Increasing | 40% | Hard | |
| 1186 | Maximum Subarray Sum with One Deletion | 33% | Medium | ❤ |
| 1185 | Day of the Week | 64% | Easy | |
| 1184 | Distance Between Bus Stops | 56% | Easy | |
| 1178 | Number of Valid Words for Each Puzzle | 35% | Hard | ❤ |
| 1177 | Can Make Palindrome from Substring | 32% | Medium | ❤ |
| 1175 | Prime Arrangements | 50% | Easy | |
| 1172 | Dinner Plate Stacks | 40% | Hard | ❤ |
| 1171 | Remove Zero Sum Consecutive Nodes from Linked List | 41% | Medium | |
| 1170 | Compare Strings by Frequency of the Smallest Character | 58% | Easy | |
| 1169 | Invalid Transactions | 28% | Medium | |
| 1163 | Last Substring in Lexicographical Order | 30% | Hard | ❤ |
| 1162 | As Far from Land as Possible | 40% | Medium | |
| 1161 | Maximum Level Sum of a Binary Tree | 70% | Medium | |
| 1160 | Find Words That Can Be Formed by Characters | 66% | Easy | |
| 1157 | Online Majority Element In Subarray | 33% | Hard | ❤ |
| 1156 | Swap For Longest Repeated Character Substring | 46% | Medium | |
| 1155 | Number of Dice Rolls With Target Sum | 48% | Medium | ❤ |
| 1154 | Day of the Year | 48% | Easy | |
| 1147 | Longest Chunked Palindrome Decomposition | 58% | Hard | |
| 1146 | Snapshot Array | 34% | Medium | ❤ |
| 1145 | Binary Tree Coloring Game | 49% | Medium | ❤ |
| 1144 | Decrease Elements To Make Array Zigzag | 43% | Medium | |
| 1143 | Longest Common Subsequence | 57% | Medium | |
| 1140 | Stone Game II | 60% | Medium | ❤ |
| 1139 | Largest 1-Bordered Square | 44% | Medium | ❤ |
| 1138 | Alphabet Board Path | 44% | Medium | ❤ |
| 1137 | N-th Tribonacci Number | 57% | Easy | ❤ |
| 1131 | Maximum of Absolute Value Expression | 52% | Medium | ❤ |
| 1130 | Minimum Cost Tree From Leaf Values | 62% | Medium | ❤ |
| 1129 | Shortest Path with Alternating Colors | 37% | Medium | ❤ |
| 1128 | Number of Equivalent Domino Pairs | 46% | Easy | |
| 1125 | Smallest Sufficient Team | 44% | Hard | ❤ |
| 1124 | Longest Well-Performing Interval | 31% | Medium | |
| 1123 | Lowest Common Ancestor of Deepest Leaves | 64% | Medium | |
| 1122 | Relative Sort Array | 66% | Easy | |
| 1111 | Maximum Nesting Depth of Two Valid Parentheses Strings | 67% | Medium | |
| 1110 | Delete Nodes And Return Forest | 64% | Medium | |
| 1109 | Corporate Flight Bookings | 49% | Medium | |
| 1108 | Defanging an IP Address | 84% | Easy | |
| 1106 | Parsing A Boolean Expression | 57% | Hard | |
| 1105 | Filling Bookcase Shelves | 56% | Medium | ❤ |
| 1104 | Path In Zigzag Labelled Binary Tree | 70% | Medium | |
| 1103 | Distribute Candies to People | 59% | Easy | |
| 1096 | Brace Expansion II | 59% | Hard | |
| 1095 | Find in Mountain Array | 34% | Hard | |
| 1094 | Car Pooling | 57% | Medium | |
| 1093 | Statistics from a Large Sample | 44% | Medium | |
| 1092 | Shortest Common Supersequence | 49% | Hard | ❤ |
| 1091 | Shortest Path in Binary Matrix | 36% | Medium | |
| 1090 | Largest Values From Labels | 57% | Medium | |
| 1089 | Duplicate Zeros | 58% | Easy | ❤ |
| 1081 | Smallest Subsequence of Distinct Characters | 44% | Medium | |
| 1080 | Insufficient Nodes in Root to Leaf Paths | 45% | Medium | ❤ |
| 1079 | Letter Tile Possibilities | 74% | Medium | ❤ |
| 1078 | Occurrences After Bigram | 64% | Easy | |
| 1074 | Number of Submatrices That Sum to Target | 58% | Hard | ❤ |
| 1073 | Adding Two Negabinary Numbers | 32% | Medium | ❤ |
| 1072 | Flip Columns For Maximum Number of Equal Rows | 59% | Medium | ❤ |
| 1071 | Greatest Common Divisor of Strings | 53% | Easy | ❤ |
| 1054 | Distant Barcodes | 40% | Medium | ❤ |
| 1053 | Previous Permutation With One Swap | 46% | Medium | |
| 1052 | Grumpy Bookstore Owner | 53% | Medium | |
| 1051 | Height Checker | 68% | Easy | |
| 1049 | Last Stone Weight II | 41% | Medium | ❤ |
| 1048 | Longest String Chain | 51% | Medium | ❤ |
| 1047 | Remove All Adjacent Duplicates In String | 65% | Easy | |
| 1046 | Last Stone Weight | 62% | Easy | |
| 1044 | Longest Duplicate Substring | 23% | Hard | ❤ |
| 1043 | Partition Array for Maximum Sum | 62% | Medium | ❤ |
| 1042 | Flower Planting With No Adjacent | 47% | Easy | ❤ |
| 1041 | Robot Bounded In Circle | 46% | Medium | |
| 1040 | Moving Stones Until Consecutive II | 49% | Medium | ❤ |
| 1039 | Minimum Score Triangulation of Polygon | 44% | Medium | ❤ |
| 1038 | Binary Search Tree to Greater Sum Tree | 77% | Medium | |
| 1037 | Valid Boomerang | 37% | Easy | |
| 1036 | Escape a Large Maze | 34% | Hard | |
| 1035 | Uncrossed Lines | 52% | Medium | ❤ |
| 1034 | Coloring A Border | 43% | Medium | |
| 1033 | Moving Stones Until Consecutive | 38% | Easy | |
| 1032 | Stream of Characters | 45% | Hard | ❤ |
| 1031 | Maximum Sum of Two Non-Overlapping Subarrays | 55% | Medium | ❤ |
| 1030 | Matrix Cells in Distance Order | 64% | Easy | ❤ |
| 1029 | Two City Scheduling | 55% | Easy | |
| 1028 | Recover a Tree From Preorder Traversal | 69% | Hard | ❤ |
| 1027 | Longest Arithmetic Sequence | 51% | Medium | ❤ |
| 1026 | Maximum Difference Between Node and Ancestor | 61% | Medium | ❤ |
| 1025 | Divisor Game | 65% | Easy | ❤ |
| 1024 | Video Stitching | 47% | Medium | ❤ |
| 1023 | Camelcase Matching | 54% | Medium | |
| 1022 | Sum of Root To Leaf Binary Numbers | 61% | Easy | ❤ |
| 1021 | Remove Outermost Parentheses | 75% | Easy | |
| 1020 | Number of Enclaves | 54% | Medium | |
| 1019 | Next Greater Node In Linked List | 56% | Medium | ❤ |
| 1018 | Binary Prefix Divisible By 5 | 46% | Easy | |
| 1017 | Convert to Base -2 | 57% | Medium | |
| 1016 | Binary String With Substrings Representing 1 To N | 58% | Medium | |
| 1015 | Smallest Integer Divisible by K | 30% | Medium | ❤ |
| 1014 | Best Sightseeing Pair | 51% | Medium | |
| 1013 | Partition Array Into Three Parts With Equal Sum | 56% | Easy | |
| 1012 | Numbers With Repeated Digits | 35% | Hard | ❤ |
| 1011 | Capacity To Ship Packages Within D Days | 55% | Medium | ❤ |
| 1010 | Pairs of Songs With Total Durations Divisible by 60 | 46% | Easy | |
| 1009 | Complement of Base 10 Integer | 59% | Easy | ❤ |
| 1008 | Construct Binary Search Tree from Preorder Traversal | 73% | Medium | |
| 1007 | Minimum Domino Rotations For Equal Row | 51% | Medium | |
| 1006 | Clumsy Factorial | 53% | Medium | |
| 1005 | Maximize Sum Of Array After K Negations | 50% | Easy | |
| 1004 | Max Consecutive Ones III | 55% | Medium | ❤ |
| 1003 | Check If Word Is Valid After Substitutions | 53% | Medium | |
| 1002 | Find Common Characters | 65% | Easy | |
| 1001 | Grid Illumination | 34% | Hard | ❤ |
| 1000 | Minimum Cost to Merge Stones | 36% | Hard | ❤ |
| 0999 | Available Captures for Rook | 65% | Easy | |
| 0998 | Maximum Binary Tree II | 61% | Medium | |
| 0997 | Find the Town Judge | 49% | Easy | |
| 0996 | Number of Squareful Arrays | 47% | Hard | ❤ |
| 0995 | Minimum Number of K Consecutive Bit Flips | 46% | Hard | |
| 0994 | Rotting Oranges | 46% | Easy | |
| 0993 | Cousins in Binary Tree | 51% | Easy | |
| 0992 | Subarrays with K Different Integers | 45% | Hard | ❤ |
| 0991 | Broken Calculator | 42% | Medium | ❤ |
| 0990 | Satisfiability of Equality Equations | 41% | Medium | |
| 0989 | Add to Array-Form of Integer | 43% | Easy | |
| 0988 | Smallest String Starting From Leaf | 44% | Medium | |
| 0987 | Vertical Order Traversal of a Binary Tree | 33% | Medium | |
| 0986 | Interval List Intersections | 64% | Medium | ❤ |
| 0985 | Sum of Even Numbers After Queries | 62% | Easy | |
| 0984 | String Without AAA or BBB | 34% | Medium | |
| 0983 | Minimum Cost For Tickets | 57% | Medium | ❤ |
| 0982 | Triples with Bitwise AND Equal To Zero | 54% | Hard | ❤ |
| 0981 | Time Based Key-Value Store | 51% | Medium | |
| 0980 | Unique Paths III | 71% | Hard | ❤ |
| 0979 | Distribute Coins in Binary Tree | 67% | Medium | ❤ |
| 0978 | Longest Turbulent Subarray | 45% | Medium | ❤ |
| 0977 | Squares of a Sorted Array | 71% | Easy | |
| 0976 | Largest Perimeter Triangle | 57% | Easy | ❤ |
| 0975 | Odd Even Jump | 45% | Hard | ❤ |
| 0974 | Subarray Sums Divisible by K | 47% | Medium | ❤ |
| 0973 | K Closest Points to Origin | 61% | Medium | |
| 0972 | Equal Rational Numbers | 40% | Hard | ❤ |
| 0971 | Flip Binary Tree To Match Preorder Traversal | 43% | Medium | ❤ |
| 0970 | Powerful Integers | 39% | Easy | |
| 0969 | Pancake Sorting | 62% | Medium | |
| 0968 | Binary Tree Cameras | 36% | Hard | |
| 0967 | Numbers With Same Consecutive Differences | 38% | Medium | |
| 0966 | Vowel Spellchecker | 44% | Medium | |
| 0965 | Univalued Binary Tree | 66% | Easy | |
| 0964 | Least Operators to Express Number | 41% | Hard | ❤ |
| 0963 | Minimum Area Rectangle II | 47% | Medium | |
| 0962 | Maximum Width Ramp | 43% | Medium | ❤ |
| 0961 | N-Repeated Element in Size 2N Array | 72% | Easy | |
| 0960 | Delete Columns to Make Sorted III | 52% | Hard | ❤ |
| 0959 | Regions Cut By Slashes | 63% | Medium | |
| 0958 | Check Completeness of a Binary Tree | 50% | Medium | |
| 0957 | Prison Cells After N Days | 38% | Medium | |
| 0956 | Tallest Billboard | 38% | Hard | ❤ |
| 0955 | Delete Columns to Make Sorted II | 32% | Medium | ❤ |
| 0954 | Array of Doubled Pairs | 35% | Medium | |
| 0953 | Verifying an Alien Dictionary | 55% | Easy | |
| 0952 | Largest Component Size by Common Factor | 27% | Hard | ❤ |
| 0951 | Flip Equivalent Binary Trees | 65% | Medium | |
| 0950 | Reveal Cards In Increasing Order | 72% | Medium | |
| 0949 | Largest Time for Given Digits | 34% | Easy | ❤ |
| 0948 | Bag of Tokens | 39% | Medium | ❤ |
| 0947 | Most Stones Removed with Same Row or Column | 54% | Medium | ❤ |
| 0946 | Validate Stack Sequences | 58% | Medium | |
| 0945 | Minimum Increment to Make Array Unique | 44% | Medium | ❤ |
| 0944 | Delete Columns to Make Sorted | 69% | Easy | |
| 0943 | Find the Shortest Superstring | 40% | Hard | ❤ |
| 0942 | DI String Match | 70% | Easy | |
| 0941 | Valid Mountain Array | 35% | Easy | |
| 0940 | Distinct Subsequences II | 40% | Hard | ❤ |
| 0939 | Minimum Area Rectangle | 51% | Medium | ❤ |
| 0938 | Range Sum of BST | 78% | Easy | |
| 0937 | Reorder Data in Log Files | 54% | Easy | |
| 0936 | Stamping The Sequence | 35% | Hard | ❤ |
| 0935 | Knight Dialer | 42% | Medium | |
| 0934 | Shortest Bridge | 45% | Medium | |
| 0933 | Number of Recent Calls | 69% | Easy | |
| 0932 | Beautiful Array | 54% | Medium | ❤ |
| 0931 | Minimum Falling Path Sum | 59% | Medium | |
| 0930 | Binary Subarrays With Sum | 39% | Medium | |
| 0929 | Unique Email Addresses | 68% | Easy | |
| 0928 | Minimize Malware Spread II | 39% | Hard | |
| 0927 | Three Equal Parts | 31% | Hard | |
| 0926 | Flip String to Monotone Increasing | 51% | Medium | |
| 0925 | Long Pressed Name | 44% | Easy | |
| 0924 | Minimize Malware Spread | 40% | Hard | |
| 0923 | 3Sum With Multiplicity | 34% | Medium | ❤ |
| 0922 | Sort Array By Parity II | 67% | Easy | |
| 0921 | Minimum Add to Make Parentheses Valid | 70% | Medium | ❤ |
| 0920 | Number of Music Playlists | 44% | Hard | ❤ |
| 0919 | Complete Binary Tree Inserter | 55% | Medium | ❤ |
| 0918 | Maximum Sum Circular Subarray | 33% | Medium | ❤ |
| 0917 | Reverse Only Letters | 56% | Easy | |
| 0916 | Word Subsets | 45% | Medium | |
| 0915 | Partition Array into Disjoint Intervals | 43% | Medium | ❤ |
| 0914 | X of a Kind in a Deck of Cards | 34% | Easy | |
| 0913 | Cat and Mouse | 29% | Hard | ❤ |
| 0912 | Sort an Array | 62% | Medium | |
| 0911 | Online Election | 48% | Medium | ❤ |
| 0910 | Smallest Range II | 24% | Medium | ❤ |
| 0909 | Snakes and Ladders | 36% | Medium | ❤ |
| 0908 | Smallest Range I | 64% | Easy | |
| 0907 | Sum of Subarray Minimums | 29% | Medium | ❤ |
| 0906 | Super Palindromes | 30% | Hard | |
| 0905 | Sort Array By Parity | 72% | Easy | |
| 0904 | Fruit Into Baskets | 41% | Medium | ❤ |
| 0903 | Valid Permutations for DI Sequence | 46% | Hard | ❤ |
| 0902 | Numbers At Most N Given Digit Set | 29% | Hard | |
| 0901 | Online Stock Span | 51% | Medium | ❤ |
| 0900 | RLE Iterator | 51% | Medium | |
| 0899 | Orderly Queue | 49% | Hard | |
| 0898 | Bitwise ORs of Subarrays | 35% | Medium | ❤ |
| 0897 | Increasing Order Search Tree | 66% | Easy | ❤ |
| 0896 | Monotonic Array | 56% | Easy | ❤ |
| 0895 | Maximum Frequency Stack | 58% | Hard | ❤ |
| 0894 | All Possible Full Binary Trees | 72% | Medium | |
| 0893 | Groups of Special-Equivalent Strings | 63% | Easy | |
| 0892 | Surface Area of 3D Shapes | 57% | Easy | |
| 0891 | Sum of Subsequence Widths | 30% | Hard | |
| 0890 | Find and Replace Pattern | 72% | Medium | |
| 0889 | Construct Binary Tree from Preorder and Postorder Traversal | 62% | Medium | |
| 0888 | Fair Candy Swap | 56% | Easy | |
| 0887 | Super Egg Drop | 25% | Hard | |
| 0886 | Possible Bipartition | 41% | Medium | |
| 0885 | Spiral Matrix III | 66% | Medium | |
| 0884 | Uncommon Words from Two Sentences | 61% | Easy | |
| 0883 | Projection Area of 3D Shapes | 66% | Easy | |
| 0882 | Reachable Nodes In Subdivided Graph | 39% | Hard | |
| 0881 | Boats to Save People | 44% | Medium | |
| 0880 | Decoded String at Index | 23% | Medium | |
| 0879 | Profitable Schemes | 37% | Hard | ❤ |
| 0878 | Nth Magical Number | 26% | Hard | |
| 0877 | Stone Game | 62% | Medium | |
| 0876 | Middle of the Linked List | 65% | Easy | |
| 0875 | Koko Eating Bananas | 48% | Medium | |
| 0874 | Walking Robot Simulation | 33% | Easy | |
| 0873 | Length of Longest Fibonacci Subsequence | 47% | Medium | |
| 0872 | Leaf-Similar Trees | 64% | Easy | |
| 0871 | Minimum Number of Refueling Stops | 30% | Hard | |
| 0870 | Advantage Shuffle | 43% | Medium | |
| 0869 | Reordered Power of 2 | 51% | Medium | |
| 0868 | Binary Gap | 59% | Easy | |
| 0867 | Transpose Matrix | 63% | Easy | |
| 0866 | Prime Palindrome | 21% | Medium | ❤ |
| 0865 | Smallest Subtree with all the Deepest Nodes | 58% | Medium | |
| 0864 | Shortest Path to Get All Keys | 38% | Hard | ❤ |
| 0863 | All Nodes Distance K in Binary Tree | 50% | Medium | ❤ |
| 0862 | Shortest Subarray with Sum at Least K | 22% | Hard | ❤ |
| 0861 | Score After Flipping Matrix | 70% | Medium | |
| 0860 | Lemonade Change | 50% | Easy | |
| 0859 | Buddy Strings | 27% | Easy | |
| 0858 | Mirror Reflection | 52% | Medium | |
| 0857 | Minimum Cost to Hire K Workers | 48% | Hard | ❤ |
| 0856 | Score of Parentheses | 57% | Medium | |
| 0855 | Exam Room | 40% | Medium | |
| 0854 | K-Similar Strings | 35% | Hard | ❤ |
| 0853 | Car Fleet | 41% | Medium | |
| 0852 | Peak Index in a Mountain Array | 70% | Easy | ❤ |
| 0851 | Loud and Rich | 49% | Medium | ❤ |
| 0850 | Rectangle Area II | 46% | Hard | ❤ |
| 0849 | Maximize Distance to Closest Person | 41% | Easy | ❤ |
| 0848 | Shifting Letters | 42% | Medium | |
| 0847 | Shortest Path Visiting All Nodes | 48% | Hard | ❤ |
| 0846 | Hand of Straights | 50% | Medium | ❤ |
| 0845 | Longest Mountain in Array | 35% | Medium | |
| 0844 | Backspace String Compare | 46% | Easy | |
| 0843 | Guess the Word | 45% | Hard | ❤ |
| 0842 | Split Array into Fibonacci Sequence | 35% | Medium | |
| 0841 | Keys and Rooms | 61% | Medium | |
| 0840 | Magic Squares In Grid | 36% | Easy | |
| 0839 | Similar String Groups | 36% | Hard | ❤ |
| 0838 | Push Dominoes | 45% | Medium | ❤ |
| 0837 | New 21 Game | 32% | Medium | ❤ |
| 0836 | Rectangle Overlap | 47% | Easy | |
| 0835 | Image Overlap | 54% | Medium | |
| 0834 | Sum of Distances in Tree | 41% | Hard | ❤ |
| 0833 | Find And Replace in String | 48% | Medium | |
| 0832 | Flipping an Image | 73% | Easy | |
| 0831 | Masking Personal Information | 42% | Medium | |
| 0830 | Positions of Large Groups | 48% | Easy | |
| 0829 | Consecutive Numbers Sum | 35% | Hard | ❤ |
| 0828 | Unique Letter String | 41% | Hard | ❤ |
| 0827 | Making A Large Island | 44% | Hard | ❤ |
| 0826 | Most Profit Assigning Work | 37% | Medium | ❤ |
| 0825 | Friends Of Appropriate Ages | 39% | Medium | |
| 0824 | Goat Latin | 59% | Easy | |
| 0823 | Binary Trees With Factors | 33% | Medium | |
| 0822 | Card Flipping Game | 41% | Medium | |
| 0821 | Shortest Distance to a Character | 64% | Easy | |
| 0820 | Short Encoding of Words | 48% | Medium | ❤ |
| 0819 | Most Common Word | 43% | Easy | |
| 0818 | Race Car | 37% | Hard | ❤ |
| 0817 | Linked List Components | 55% | Medium | |
| 0816 | Ambiguous Coordinates | 45% | Medium | |
| 0815 | Bus Routes | 41% | Hard | ❤ |
| 0814 | Binary Tree Pruning | 72% | Medium | |
| 0813 | Largest Sum of Averages | 47% | Medium | ❤ |
| 0812 | Largest Triangle Area | 56% | Easy | |
| 0811 | Subdomain Visit Count | 66% | Easy | |
| 0810 | Chalkboard XOR Game | 45% | Hard | ❤ |
| 0809 | Expressive Words | 45% | Medium | |
| 0808 | Soup Servings | 38% | Medium | |
| 0807 | Max Increase to Keep City Skyline | 82% | Medium | |
| 0806 | Number of Lines To Write String | 63% | Easy | |
| 0805 | Split Array With Same Average | 25% | Hard | ❤ |
| 0804 | Unique Morse Code Words | 75% | Easy | |
| 0803 | Bricks Falling When Hit | 29% | Hard | ❤ |
| 0802 | Find Eventual Safe States | 45% | Medium | ❤ |
| 0801 | Minimum Swaps To Make Sequences Increasing | 36% | Medium | ❤ |
| 0799 | Champagne Tower | 34% | Medium | ❤ |
| 0798 | Smallest Rotation with Highest Score | 41% | Hard | ❤ |
| 0797 | All Paths From Source to Target | 72% | Medium | |
| 0796 | Rotate String | 49% | Easy | |
| 0795 | Number of Subarrays with Bounded Maximum | 44% | Medium | ❤ |
| 0794 | Valid Tic-Tac-Toe State | 31% | Medium | |
| 0793 | Preimage Size of Factorial Zeroes Function | 39% | Hard | ❤ |
| 0792 | Number of Matching Subsequences | 45% | Medium | ❤ |
| 0791 | Custom Sort String | 63% | Medium | |
| 0790 | Domino and Tromino Tiling | 37% | Medium | ❤ |
| 0789 | Escape The Ghosts | 56% | Medium | |
| 0788 | Rotated Digits | 55% | Easy | |
| 0787 | Cheapest Flights Within K Stops | 36% | Medium | ❤ |
| 0786 | K-th Smallest Prime Fraction | 41% | Hard | ❤ |
| 0785 | Is Graph Bipartite? | 45% | Medium | ❤ |
| 0784 | Letter Case Permutation | 59% | Easy | ❤ |
| 0783 | Minimum Distance Between BST Nodes | 51% | Easy | |
| 0782 | Transform to Chessboard | 39% | Hard | |
| 0781 | Rabbits in Forest | 52% | Medium | |
| 0780 | Reaching Points | 28% | Hard | |
| 0779 | K-th Symbol in Grammar | 37% | Medium | |
| 0778 | Swim in Rising Water | 49% | Hard | |
| 0777 | Swap Adjacent in LR String | 34% | Medium | |
| 0775 | Global and Local Inversions | 40% | Medium | |
| 0773 | Sliding Puzzle | 55% | Hard | |
| 0771 | Jewels and Stones | 83% | Easy | |
| 0770 | Basic Calculator IV | 46% | Hard | ❤ |
| 0769 | Max Chunks To Make Sorted | 52% | Medium | |
| 0768 | Max Chunks To Make Sorted II | 46% | Hard | |
| 0767 | Reorganize String | 44% | Medium | |
| 0766 | Toeplitz Matrix | 62% | Easy | |
| 0765 | Couples Holding Hands | 52% | Hard | |
| 0764 | Largest Plus Sign | 44% | Medium | |
| 0763 | Partition Labels | 72% | Medium | |
| 0762 | Prime Number of Set Bits in Binary Representation | 60% | Easy | |
| 0761 | Special Binary String | 53% | Hard | |
| 0757 | Set Intersection Size At Least Two | 37% | Hard | |
| 0756 | Pyramid Transition Matrix | 52% | Medium | ❤ |
| 0754 | Reach a Number | 33% | Easy | ❤ |
| 0753 | Cracking the Safe | 48% | Hard | ❤ |
| 0752 | Open the Lock | 47% | Medium | ❤ |
| 0749 | Contain Virus | 42% | Hard | |
| 0748 | Shortest Completing Word | 55% | Easy | |
| 0747 | Largest Number At Least Twice of Others | 40% | Easy | |
| 0746 | Min Cost Climbing Stairs | 48% | Easy | |
| 0745 | Prefix and Suffix Search | 32% | Hard | |
| 0744 | Find Smallest Letter Greater Than Target | 44% | Easy | |
| 0743 | Network Delay Time | 44% | Medium | |
| 0741 | Cherry Pickup | 31% | Hard | |
| 0740 | Delete and Earn | 47% | Medium | ❤ |
| 0739 | Daily Temperatures | 61% | Medium | ❤ |
| 0738 | Monotone Increasing Digits | 42% | Medium | |
| 0736 | Parse Lisp Expression | 45% | Hard | ❤ |
| 0735 | Asteroid Collision | 39% | Medium | |
| 0733 | Flood Fill | 52% | Easy | |
| 0732 | My Calendar III | 57% | Hard | |
| 0731 | My Calendar II | 46% | Medium | ❤ |
| 0730 | Count Different Palindromic Subsequences | 40% | Hard | ❤ |
| 0729 | My Calendar I | 49% | Medium | |
| 0728 | Self Dividing Numbers | 71% | Easy | |
| 0726 | Number of Atoms | 46% | Hard | ❤ |
| 0725 | Split Linked List in Parts | 50% | Medium | |
| 0724 | Find Pivot Index | 42% | Easy | |
| 0722 | Remove Comments | 32% | Medium | ❤ |
| 0721 | Accounts Merge | 43% | Medium | ❤ |
| 0720 | Longest Word in Dictionary | 46% | Easy | |
| 0719 | Find K-th Smallest Pair Distance | 30% | Hard | ❤ |
| 0718 | Maximum Length of Repeated Subarray | 47% | Medium | ❤ |
| 0717 | 1-bit and 2-bit Characters | 49% | Easy | |
| 0715 | Range Module | 36% | Hard | |
| 0714 | Best Time to Buy and Sell Stock with Transaction Fee | 52% | Medium | ❤ |
| 0713 | Subarray Product Less Than K | 37% | Medium | ❤ |
| 0712 | Minimum ASCII Delete Sum for Two Strings | 55% | Medium | ❤ |
| 0710 | Random Pick with Blacklist | 32% | Hard | ❤ |
| 0709 | To Lower Case | 77% | Easy | |
| 0707 | Design Linked List | 20% | Medium | ❤ |
| 0706 | Design HashMap | 57% | Easy | |
| 0705 | Design HashSet | 56% | Easy | |
| 0704 | Binary Search | 49% | Easy | |
| 0703 | Kth Largest Element in a Stream | 47% | Easy | |
| 0701 | Insert into a Binary Search Tree | 77% | Medium | |
| 0700 | Search in a Binary Search Tree | 69% | Easy | |
| 0699 | Falling Squares | 40% | Hard | |
| 0698 | Partition to K Equal Sum Subsets | 43% | Medium | ❤ |
| 0697 | Degree of an Array | 51% | Easy | |
| 0696 | Count Binary Substrings | 54% | Easy | |
| 0695 | Max Area of Island | 59% | Medium | ❤ |
| 0693 | Binary Number with Alternating Bits | 58% | Easy | |
| 0692 | Top K Frequent Words | 47% | Medium | |
| 0691 | Stickers to Spell Word | 40% | Hard | ❤ |
| 0689 | Maximum Sum of 3 Non-Overlapping Subarrays | 44% | Hard | |
| 0688 | Knight Probability in Chessboard | 46% | Medium | |
| 0687 | Longest Univalue Path | 34% | Easy | |
| 0686 | Repeated String Match | 31% | Easy | ❤ |
| 0685 | Redundant Connection II | 31% | Hard | ❤ |
| 0684 | Redundant Connection | 54% | Medium | |
| 0682 | Baseball Game | 61% | Easy | |
| 0680 | Valid Palindrome II | 35% | Easy | |
| 0679 | 24 Game | 44% | Hard | ❤ |
| 0678 | Valid Parenthesis String | 33% | Medium | ❤ |
| 0677 | Map Sum Pairs | 52% | Medium | ❤ |
| 0676 | Implement Magic Dictionary | 52% | Medium | |
| 0675 | Cut Off Trees for Golf Event | 32% | Hard | ❤ |
| 0674 | Longest Continuous Increasing Subsequence | 44% | Easy | |
| 0673 | Number of Longest Increasing Subsequence | 34% | Medium | ❤ |
| 0672 | Bulb Switcher II | 50% | Medium | |
| 0671 | Second Minimum Node In a Binary Tree | 43% | Easy | |
| 0670 | Maximum Swap | 41% | Medium | ❤ |
| 0669 | Trim a Binary Search Tree | 61% | Easy | |
| 0668 | Kth Smallest Number in Multiplication Table | 43% | Hard | |
| 0667 | Beautiful Arrangement II | 52% | Medium | |
| 0665 | Non-decreasing Array | 19% | Easy | |
| 0664 | Strange Printer | 38% | Hard | ❤ |
| 0662 | Maximum Width of Binary Tree | 39% | Medium | |
| 0661 | Image Smoother | 49% | Easy | |
| 0659 | Split Array into Consecutive Subsequences | 42% | Medium | ❤ |
| 0658 | Find K Closest Elements | 39% | Medium | ❤ |
| 0657 | Robot Return to Origin | 72% | Easy | |
| 0655 | Print Binary Tree | 52% | Medium | |
| 0654 | Maximum Binary Tree | 77% | Medium | ❤ |
| 0653 | Two Sum IV - Input is a BST | 53% | Easy | |
| 0652 | Find Duplicate Subtrees | 47% | Medium | |
| 0650 | 2 Keys Keyboard | 47% | Medium | |
| 0649 | Dota2 Senate | 38% | Medium | ❤ |
| 0648 | Replace Words | 53% | Medium | |
| 0647 | Palindromic Substrings | 58% | Medium | ❤ |
| 0646 | Maximum Length of Pair Chain | 49% | Medium | |
| 0645 | Set Mismatch | 41% | Easy | ❤ |
| 0643 | Maximum Average Subarray I | 40% | Easy | |
| 0641 | Design Circular Deque | 50% | Medium | ❤ |
| 0640 | Solve the Equation | 40% | Medium | |
| 0639 | Decode Ways II | 25% | Hard | |
| 0638 | Shopping Offers | 50% | Medium | ❤ |
| 0637 | Average of Levels in Binary Tree | 60% | Easy | |
| 0636 | Exclusive Time of Functions | 49% | Medium | ❤ |
| 0633 | Sum of Square Numbers | 32% | Easy | |
| 0632 | Smallest Range Covering Elements from K Lists | 49% | Hard | |
| 0630 | Course Schedule III | 32% | Hard | ❤ |
| 0629 | K Inverse Pairs Array | 29% | Hard | |
| 0628 | Maximum Product of Three Numbers | 46% | Easy | ❤ |
| 0623 | Add One Row to Tree | 47% | Medium | |
| 0622 | Design Circular Queue | 41% | Medium | |
| 0621 | Task Scheduler | 46% | Medium | ❤ |
| 0617 | Merge Two Binary Trees | 71% | Easy | |
| 0611 | Valid Triangle Number | 46% | Medium | ❤ |
| 0609 | Find Duplicate File in System | 56% | Medium | |
| 0606 | Construct String from Binary Tree | 52% | Easy | |
| 0605 | Can Place Flowers | 31% | Easy | ❤ |
| 0600 | Non-negative Integers without Consecutive Ones | 33% | Hard | ❤ |
| 0599 | Minimum Index Sum of Two Lists | 48% | Easy | |
| 0598 | Range Addition II | 49% | Easy | |
| 0594 | Longest Harmonious Subsequence | 44% | Easy | |
| 0593 | Valid Square | 41% | Medium | |
| 0592 | Fraction Addition and Subtraction | 47% | Medium | |
| 0591 | Tag Validator | 33% | Hard | ❤ |
| 0587 | Erect the Fence | 34% | Hard | ❤ |
| 0583 | Delete Operation for Two Strings | 46% | Medium | ❤ |
| 0581 | Shortest Unsorted Continuous Subarray | 30% | Easy | ❤ |
| 0576 | Out of Boundary Paths | 33% | Medium | ❤ |
| 0575 | Distribute Candies | 60% | Easy | |
| 0572 | Subtree of Another Tree | 42% | Easy | ❤ |
| 0567 | Permutation in String | 39% | Medium | |
| 0566 | Reshape the Matrix | 59% | Easy | |
| 0565 | Array Nesting | 53% | Medium | |
| 0564 | Find the Closest Palindrome | 19% | Hard | |
| 0563 | Binary Tree Tilt | 47% | Easy | |
| 0561 | Array Partition I | 70% | Easy | |
| 0560 | Subarray Sum Equals K | 43% | Medium | ❤ |
| 0557 | Reverse Words in a String III | 66% | Easy | |
| 0556 | Next Greater Element III | 30% | Medium | |
| 0554 | Brick Wall | 48% | Medium | |
| 0553 | Optimal Division | 55% | Medium | |
| 0552 | Student Attendance Record II | 34% | Hard | ❤ |
| 0551 | Student Attendance Record I | 46% | Easy | |
| 0547 | Friend Circles | 55% | Medium | ❤ |
| 0546 | Remove Boxes | 39% | Hard | ❤ |
| 0543 | Diameter of Binary Tree | 47% | Easy | |
| 0542 | 01 Matrix | 37% | Medium | ❤ |
| 0541 | Reverse String II | 46% | Easy | |
| 0540 | Single Element in a Sorted Array | 57% | Medium | |
| 0539 | Minimum Time Difference | 49% | Medium | |
| 0538 | Convert BST to Greater Tree | 52% | Easy | |
| 0537 | Complex Number Multiplication | 66% | Medium | |
| 0532 | K-diff Pairs in an Array | 30% | Easy | |
| 0530 | Minimum Absolute Difference in BST | 51% | Easy | ❤ |
| 0529 | Minesweeper | 55% | Medium | |
| 0528 | Random Pick with Weight | 43% | Medium | |
| 0526 | Beautiful Arrangement | 55% | Medium | ❤ |
| 0525 | Contiguous Array | 43% | Medium | ❤ |
| 0524 | Longest Word in Dictionary through Deleting | 46% | Medium | |
| 0523 | Continuous Subarray Sum | 24% | Medium | ❤ |
| 0522 | Longest Uncommon Subsequence II | 33% | Medium | |
| 0521 | Longest Uncommon Subsequence I | 56% | Easy | |
| 0520 | Detect Capital | 52% | Easy | |
| 0519 | Random Flip Matrix | 34% | Medium | |
| 0518 | Coin Change 2 | 44% | Medium | ❤ |
| 0517 | Super Washing Machines | 37% | Hard | ❤ |
| 0516 | Longest Palindromic Subsequence | 49% | Medium | ❤ |
| 0515 | Find Largest Value in Each Tree Row | 58% | Medium | |
| 0514 | Freedom Trail | 41% | Hard | |
| 0513 | Find Bottom Left Tree Value | 59% | Medium | |
| 0509 | Fibonacci Number | 66% | Easy | |
| 0508 | Most Frequent Subtree Sum | 55% | Medium | |
| 0507 | Perfect Number | 35% | Easy | |
| 0506 | Relative Ranks | 49% | Easy | |
| 0504 | Base 7 | 45% | Easy | |
| 0503 | Next Greater Element II | 52% | Medium | ❤ |
| 0502 | IPO | 38% | Hard | |
| 0501 | Find Mode in Binary Search Tree | 40% | Easy | ❤ |
| 0500 | Keyboard Row | 63% | Easy | |
| 0498 | Diagonal Traverse | 46% | Medium | |
| 0497 | Random Point in Non-overlapping Rectangles | 36% | Medium | |
| 0496 | Next Greater Element I | 61% | Easy | |
| 0495 | Teemo Attacking | 52% | Medium | |
| 0494 | Target Sum | 45% | Medium | ❤ |
| 0493 | Reverse Pairs | 23% | Hard | |
| 0492 | Construct the Rectangle | 48% | Easy | ❤ |
| 0491 | Increasing Subsequences | 43% | Medium | ❤ |
| 0488 | Zuma Game | 40% | Hard | ❤ |
| 0486 | Predict the Winner | 47% | Medium | |
| 0485 | Max Consecutive Ones | 55% | Easy | |
| 0483 | Smallest Good Base | 34% | Hard | ❤ |
| 0482 | License Key Formatting | 41% | Easy | |
| 0481 | Magical String | 46% | Medium | |
| 0480 | Sliding Window Median | 34% | Hard | ❤ |
| 0479 | Largest Palindrome Product | 27% | Hard | |
| 0478 | Generate Random Point in a Circle | 37% | Medium | |
| 0477 | Total Hamming Distance | 49% | Medium | ❤ |
| 0476 | Number Complement | 62% | Easy | |
| 0475 | Heaters | 32% | Easy | |
| 0474 | Ones and Zeroes | 40% | Medium | |
| 0473 | Matchsticks to Square | 36% | Medium | ❤ |
| 0472 | Concatenated Words | 37% | Hard | |
| 0470 | Implement Rand10() Using Rand7() | 45% | Medium | ❤ |
| 0468 | Validate IP Address | 21% | Medium | |
| 0467 | Unique Substrings in Wraparound String | 34% | Medium | ❤ |
| 0466 | Count The Repetitions | 27% | Hard | ❤ |
| 0464 | Can I Win | 28% | Medium | ❤ |
| 0463 | Island Perimeter | 62% | Easy | |
| 0462 | Minimum Moves to Equal Array Elements II | 52% | Medium | |
| 0461 | Hamming Distance | 70% | Easy | |
| 0460 | LFU Cache | 30% | Hard | |
| 0459 | Repeated Substring Pattern | 40% | Easy | ❤ |
| 0458 | Poor Pigs | 46% | Hard | |
| 0457 | Circular Array Loop | 28% | Medium | |
| 0456 | 132 Pattern | 27% | Medium | ❤ |
| 0455 | Assign Cookies | 48% | Easy | |
| 0454 | 4Sum II | 51% | Medium | |
| 0453 | Minimum Moves to Equal Array Elements | 49% | Easy | |
| 0452 | Minimum Number of Arrows to Burst Balloons | 47% | Medium | |
| 0451 | Sort Characters By Frequency | 57% | Medium | |
| 0450 | Delete Node in a BST | 40% | Medium | ❤ |
| 0448 | Find All Numbers Disappeared in an Array | 54% | Easy | |
| 0447 | Number of Boomerangs | 50% | Easy | |
| 0446 | Arithmetic Slices II - Subsequence | 31% | Hard | ❤ |
| 0445 | Add Two Numbers II | 51% | Medium | ❤ |
| 0443 | String Compression | 38% | Easy | ❤ |
| 0442 | Find All Duplicates in an Array | 62% | Medium | |
| 0441 | Arranging Coins | 38% | Easy | |
| 0440 | K-th Smallest in Lexicographical Order | 27% | Hard | ❤ |
| 0438 | Find All Anagrams in a String | 39% | Medium | |
| 0437 | Path Sum III | 44% | Easy | ❤ |
| 0436 | Find Right Interval | 43% | Medium | |
| 0435 | Non-overlapping Intervals | 41% | Medium | ❤ |
| 0434 | Number of Segments in a String | 37% | Easy | |
| 0433 | Minimum Genetic Mutation | 39% | Medium | |
| 0432 | All O`one Data Structure | 30% | Hard | ❤ |
| 0424 | Longest Repeating Character Replacement | 44% | Medium | ❤ |
| 0423 | Reconstruct Original Digits from English | 46% | Medium | |
| 0421 | Maximum XOR of Two Numbers in an Array | 52% | Medium | ❤ |
| 0420 | Strong Password Checker | 16% | Hard | ❤ |
| 0419 | Battleships in a Board | 66% | Medium | |
| 0417 | Pacific Atlantic Water Flow | 38% | Medium | |
| 0416 | Partition Equal Subset Sum | 41% | Medium | ❤ |
| 0415 | Add Strings | 45% | Easy | |
| 0414 | Third Maximum Number | 29% | Easy | |
| 0413 | Arithmetic Slices | 56% | Medium | |
| 0412 | Fizz Buzz | 60% | Easy | |
| 0410 | Split Array Largest Sum | 43% | Hard | |
| 0409 | Longest Palindrome | 48% | Easy | |
| 0407 | Trapping Rain Water II | 40% | Hard | |
| 0406 | Queue Reconstruction by Height | 61% | Medium | ❤ |
| 0405 | Convert a Number to Hexadecimal | 42% | Easy | |
| 0404 | Sum of Left Leaves | 49% | Easy | |
| 0403 | Frog Jump | 37% | Hard | ❤ |
| 0402 | Remove K Digits | 27% | Medium | ❤ |
| 0401 | Binary Watch | 45% | Easy | |
| 0400 | Nth Digit | 30% | Medium | ❤ |
| 0399 | Evaluate Division | 49% | Medium | ❤ |
| 0398 | Random Pick Index | 51% | Medium | |
| 0397 | Integer Replacement | 32% | Medium | ❤ |
| 0396 | Rotate Function | 35% | Medium | ❤ |
| 0395 | Longest Substring with At Least K Repeating Characters | 39% | Medium | |
| 0394 | Decode String | 47% | Medium | |
| 0393 | UTF-8 Validation | 36% | Medium | ❤ |
| 0392 | Is Subsequence | 47% | Easy | ❤ |
| 0391 | Perfect Rectangle | 28% | Hard | |
| 0390 | Elimination Game | 43% | Medium | ❤ |
| 0389 | Find the Difference | 53% | Easy | |
| 0388 | Longest Absolute File Path | 40% | Medium | |
| 0387 | First Unique Character in a String | 50% | Easy | |
| 0386 | Lexicographical Numbers | 48% | Medium | |
| 0385 | Mini Parser | 32% | Medium | ❤ |
| 0384 | Shuffle an Array | 51% | Medium | ❤ |
| 0383 | Ransom Note | 50% | Easy | |
| 0382 | Linked List Random Node | 50% | Medium | |
| 0381 | Insert Delete GetRandom O(1) - Duplicates allowed | 32% | Hard | ❤ |
| 0380 | Insert Delete GetRandom O(1) | 44% | Medium | ❤ |
| 0378 | Kth Smallest Element in a Sorted Matrix | 51% | Medium | ❤ |
| 0377 | Combination Sum IV | 44% | Medium | |
| 0376 | Wiggle Subsequence | 38% | Medium | ❤ |
| 0375 | Guess Number Higher or Lower II | 38% | Medium | |
| 0373 | Find K Pairs with Smallest Sums | 34% | Medium | ❤ |
| 0372 | Super Pow | 36% | Medium | |
| 0371 | Sum of Two Integers | 50% | Easy | ❤ |
| 0368 | Largest Divisible Subset | 35% | Medium | ❤ |
| 0367 | Valid Perfect Square | 40% | Easy | |
| 0365 | Water and Jug Problem | 29% | Medium | ❤ |
| 0363 | Max Sum of Rectangle No Larger Than K | 35% | Hard | ❤ |
| 0357 | Count Numbers with Unique Digits | 47% | Medium | ❤ |
| 0355 | Design Twitter | 28% | Medium | ❤ |
| 0354 | Russian Doll Envelopes | 34% | Hard | ❤ |
| 0352 | Data Stream as Disjoint Intervals | 44% | Hard | |
| 0350 | Intersection of Two Arrays II | 49% | Easy | ❤ |
| 0349 | Intersection of Two Arrays | 57% | Easy | |
| 0347 | Top K Frequent Elements | 57% | Medium | |
| 0345 | Reverse Vowels of a String | 42% | Easy | |
| 0344 | Reverse String | 64% | Easy | |
| 0343 | Integer Break | 48% | Medium | |
| 0342 | Power of Four | 40% | Easy | |
| 0338 | Counting Bits | 65% | Medium | |
| 0337 | House Robber III | 49% | Medium | ❤ |
| 0336 | Palindrome Pairs | 32% | Hard | ❤ |
| 0335 | Self Crossing | 27% | Hard | |
| 0334 | Increasing Triplet Subsequence | 39% | Medium | ❤ |
| 0332 | Reconstruct Itinerary | 33% | Medium | ❤ |
| 0331 | Verify Preorder Serialization of a Binary Tree | 39% | Medium | ❤ |
| 0330 | Patching Array | 33% | Hard | |
| 0329 | Longest Increasing Path in a Matrix | 41% | Hard | ❤ |
| 0328 | Odd Even Linked List | 50% | Medium | ❤ |
| 0327 | Count of Range Sum | 33% | Hard | ❤ |
| 0326 | Power of Three | 41% | Easy | ❤ |
| 0324 | Wiggle Sort II | 28% | Medium | |
| 0322 | Coin Change | 32% | Medium | ❤ |
| 0321 | Create Maximum Number | 25% | Hard | ❤ |
| 0319 | Bulb Switcher | 44% | Medium | ❤ |
| 0318 | Maximum Product of Word Lengths | 49% | Medium | ❤ |
| 0316 | Remove Duplicate Letters | 33% | Hard | ❤ |
| 0315 | Count of Smaller Numbers After Self | 39% | Hard | |
| 0313 | Super Ugly Number | 42% | Medium | ❤ |
| 0312 | Burst Balloons | 48% | Hard | ❤ |
| 0310 | Minimum Height Trees | 31% | Medium | |
| 0309 | Best Time to Buy and Sell Stock with Cooldown | 45% | Medium | ❤ |
| 0307 | Range Sum Query - Mutable | 30% | Medium | |
| 0306 | Additive Number | 28% | Medium | |
| 0304 | Range Sum Query 2D - Immutable | 34% | Medium | |
| 0303 | Range Sum Query - Immutable | 40% | Easy | |
| 0301 | Remove Invalid Parentheses | 40% | Hard | ❤ |
| 0300 | Longest Increasing Subsequence | 41% | Medium | ❤ |
| 0299 | Bulls and Cows | 40% | Easy | |
| 0295 | Find Median from Data Stream | 39% | Hard | ❤ |
| 0292 | Nim Game | 55% | Easy | ❤ |
| 0290 | Word Pattern | 35% | Easy | |
| 0289 | Game of Life | 49% | Medium | ❤ |
| 0287 | Find the Duplicate Number | 51% | Medium | ❤ |
| 0283 | Move Zeroes | 55% | Easy | |
| 0282 | Expression Add Operators | 34% | Hard | ❤ |
| 0279 | Perfect Squares | 43% | Medium | ❤ |
| 0275 | H-Index II | 35% | Medium | ❤ |
| 0274 | H-Index | 34% | Medium | |
| 0273 | Integer to English Words | 25% | Hard | ❤ |
| 0268 | Missing Number | 49% | Easy | |
| 0264 | Ugly Number II | 37% | Medium | ❤ |
| 0263 | Ugly Number | 41% | Easy | |
| 0260 | Single Number III | 58% | Medium | ❤ |
| 0258 | Add Digits | 55% | Easy | |
| 0257 | Binary Tree Paths | 47% | Easy | |
| 0242 | Valid Anagram | 54% | Easy | |
| 0241 | Different Ways to Add Parentheses | 52% | Medium | |
| 0240 | Search a 2D Matrix II | 41% | Medium | ❤ |
| 0239 | Sliding Window Maximum | 39% | Hard | ❤ |
| 0238 | Product of Array Except Self | 57% | Medium | |
| 0237 | Delete Node in a Linked List | 56% | Easy | ❤ |
| 0236 | Lowest Common Ancestor of a Binary Tree | 40% | Medium | ❤ |
| 0235 | Lowest Common Ancestor of a Binary Search Tree | 46% | Easy | ❤ |
| 0234 | Palindrome Linked List | 37% | Easy | |
| 0233 | Number of Digit One | 30% | Hard | ❤ |
| 0232 | Implement Queue using Stacks | 45% | Easy | |
| 0231 | Power of Two | 42% | Easy | |
| 0230 | Kth Smallest Element in a BST | 54% | Medium | |
| 0229 | Majority Element II | 33% | Medium | ❤ |
| 0228 | Summary Ranges | 37% | Medium | |
| 0227 | Basic Calculator II | 34% | Medium | |
| 0226 | Invert Binary Tree | 60% | Easy | |
| 0225 | Implement Stack using Queues | 41% | Easy | |
| 0224 | Basic Calculator | 34% | Hard | |
| 0223 | Rectangle Area | 36% | Medium | |
| 0222 | Count Complete Tree Nodes | 38% | Medium | |
| 0221 | Maximal Square | 34% | Medium | ❤ |
| 0220 | Contains Duplicate III | 20% | Medium | ❤ |
| 0219 | Contains Duplicate II | 36% | Easy | |
| 0218 | The Skyline Problem | 32% | Hard | ❤ |
| 0217 | Contains Duplicate | 53% | Easy | |
| 0216 | Combination Sum III | 53% | Medium | |
| 0215 | Kth Largest Element in an Array | 50% | Medium | ❤ |
| 0214 | Shortest Palindrome | 28% | Hard | ❤ |
| 0213 | House Robber II | 35% | Medium | |
| 0212 | Word Search II | 30% | Hard | ❤ |
| 0211 | Add and Search Word - Data structure design | 32% | Medium | ❤ |
| 0210 | Course Schedule II | 36% | Medium | |
| 0209 | Minimum Size Subarray Sum | 35% | Medium | |
| 0208 | Implement Trie (Prefix Tree) | 41% | Medium | ❤ |
| 0207 | Course Schedule | 39% | Medium | ❤ |
| 0206 | Reverse Linked List | 57% | Easy | |
| 0205 | Isomorphic Strings | 38% | Easy | ❤ |
| 0204 | Count Primes | 30% | Easy | ❤ |
| 0203 | Remove Linked List Elements | 36% | Easy | |
| 0202 | Happy Number | 47% | Easy | |
| 0201 | Bitwise AND of Numbers Range | 36% | Medium | ❤ |
| 0200 | Number of Islands | 43% | Medium | |
| 0199 | Binary Tree Right Side View | 50% | Medium | |
| 0198 | House Robber | 41% | Easy | ❤ |
| 0191 | Number of 1 Bits | 45% | Easy | |
| 0190 | Reverse Bits | 33% | Easy | |
| 0189 | Rotate Array | 31% | Easy | |
| 0188 | Best Time to Buy and Sell Stock IV | 27% | Hard | ❤ |
| 0187 | Repeated DNA Sequences | 37% | Medium | |
| 0179 | Largest Number | 26% | Medium | ❤ |
| 0174 | Dungeon Game | 28% | Hard | ❤ |
| 0173 | Binary Search Tree Iterator | 51% | Medium | ❤ |
| 0172 | Factorial Trailing Zeroes | 37% | Easy | |
| 0171 | Excel Sheet Column Number | 52% | Easy | |
| 0169 | Majority Element | 54% | Easy | ❤ |
| 0168 | Excel Sheet Column Title | 29% | Easy | ❤ |
| 0167 | Two Sum II - Input array is sorted | 51% | Easy | |
| 0166 | Fraction to Recurring Decimal | 20% | Medium | ❤ |
| 0165 | Compare Version Numbers | 25% | Medium | |
| 0164 | Maximum Gap | 33% | Hard | |
| 0162 | Find Peak Element | 42% | Medium | |
| 0160 | Intersection of Two Linked Lists | 36% | Easy | |
| 0155 | Min Stack | 39% | Easy | |
| 0154 | Find Minimum in Rotated Sorted Array II | 39% | Hard | |
| 0153 | Find Minimum in Rotated Sorted Array | 43% | Medium | |
| 0152 | Maximum Product Subarray | 30% | Medium | ❤ |
| 0150 | Evaluate Reverse Polish Notation | 33% | Medium | |
| 0149 | Max Points on a Line | 16% | Hard | ❤ |
| 0148 | Sort List | 37% | Medium | ❤ |
| 0147 | Insertion Sort List | 38% | Medium | ❤ |
| 0146 | LRU Cache | 28% | Medium | ❤ |
| 0145 | Binary Tree Postorder Traversal | 50% | Hard | |
| 0144 | Binary Tree Preorder Traversal | 53% | Medium | ❤ |
| 0143 | Reorder List | 32% | Medium | ❤ |
| 0142 | Linked List Cycle II | 34% | Medium | ❤ |
| 0141 | Linked List Cycle | 38% | Easy | |
| 0140 | Word Break II | 28% | Hard | ❤ |
| 0139 | Word Break | 37% | Medium | ❤ |
| 0137 | Single Number II | 47% | Medium | |
| 0136 | Single Number | 61% | Easy | |
| 0135 | Candy | 29% | Hard | |
| 0134 | Gas Station | 35% | Medium | ❤ |
| 0132 | Palindrome Partitioning II | 28% | Hard | ❤ |
| 0131 | Palindrome Partitioning | 43% | Medium | ❤ |
| 0130 | Surrounded Regions | 24% | Medium | ❤ |
| 0129 | Sum Root to Leaf Numbers | 44% | Medium | |
| 0128 | Longest Consecutive Sequence | 43% | Hard | |
| 0127 | Word Ladder | 26% | Medium | ❤ |
| 0126 | Word Ladder II | 19% | Hard | ❤ |
| 0125 | Valid Palindrome | 32% | Easy | |
| 0124 | Binary Tree Maximum Path Sum | 31% | Hard | ❤ |
| 0123 | Best Time to Buy and Sell Stock III | 35% | Hard | |
| 0122 | Best Time to Buy and Sell Stock II | 53% | Easy | |
| 0121 | Best Time to Buy and Sell Stock | 48% | Easy | |
| 0120 | Triangle | 41% | Medium | ❤ |
| 0119 | Pascal's Triangle II | 45% | Easy | |
| 0118 | Pascal's Triangle | 48% | Easy | |
| 0115 | Distinct Subsequences | 36% | Hard | ❤ |
| 0114 | Flatten Binary Tree to Linked List | 44% | Medium | ❤ |
| 0113 | Path Sum II | 42% | Medium | |
| 0112 | Path Sum | 39% | Easy | |
| 0111 | Minimum Depth of Binary Tree | 36% | Easy | |
| 0110 | Balanced Binary Tree | 42% | Easy | |
| 0109 | Convert Sorted List to Binary Search Tree | 43% | Medium | |
| 0108 | Convert Sorted Array to Binary Search Tree | 53% | Easy | |
| 0107 | Binary Tree Level Order Traversal II | 48% | Easy | |
| 0106 | Construct Binary Tree from Inorder and Postorder Traversal | 41% | Medium | ❤ |
| 0105 | Construct Binary Tree from Preorder and Inorder Traversal | 43% | Medium | ❤ |
| 0104 | Maximum Depth of Binary Tree | 62% | Easy | |
| 0103 | Binary Tree Zigzag Level Order Traversal | 43% | Medium | |
| 0102 | Binary Tree Level Order Traversal | 50% | Medium | |
| 0101 | Symmetric Tree | 44% | Easy | ❤ |
| 0100 | Same Tree | 51% | Easy | |
| 0099 | Recover Binary Search Tree | 36% | Hard | ❤ |
| 0098 | Validate Binary Search Tree | 26% | Medium | ❤ |
| 0097 | Interleaving String | 29% | Hard | ❤ |
| 0096 | Unique Binary Search Trees | 48% | Medium | |
| 0095 | Unique Binary Search Trees II | 37% | Medium | ❤ |
| 0094 | Binary Tree Inorder Traversal | 59% | Medium | |
| 0093 | Restore IP Addresses | 32% | Medium | ❤ |
| 0092 | Reverse Linked List II | 36% | Medium | |
| 0091 | Decode Ways | 23% | Medium | |
| 0090 | Subsets II | 44% | Medium | |
| 0089 | Gray Code | 47% | Medium | |
| 0088 | Merge Sorted Array | 37% | Easy | |
| 0087 | Scramble String | 32% | Hard | ❤ |
| 0086 | Partition List | 38% | Medium | |
| 0085 | Maximal Rectangle | 35% | Hard | ❤ |
| 0084 | Largest Rectangle in Histogram | 32% | Hard | |
| 0083 | Remove Duplicates from Sorted List | 43% | Easy | |
| 0082 | Remove Duplicates from Sorted List II | 34% | Medium | |
| 0081 | Search in Rotated Sorted Array II | 32% | Medium | |
| 0080 | Remove Duplicates from Sorted Array II | 41% | Medium | |
| 0079 | Word Search | 32% | Medium | |
| 0078 | Subsets | 56% | Medium | |
| 0077 | Combinations | 50% | Medium | |
| 0076 | Minimum Window Substring | 32% | Hard | |
| 0075 | Sort Colors | 43% | Medium | |
| 0074 | Search a 2D Matrix | 35% | Medium | |
| 0073 | Set Matrix Zeroes | 41% | Medium | |
| 0072 | Edit Distance | 40% | Hard | |
| 0071 | Simplify Path | 30% | Medium | |
| 0070 | Climbing Stairs | 45% | Easy | |
| 0069 | Sqrt(x) | 32% | Easy | |
| 0068 | Text Justification | 24% | Hard | |
| 0067 | Add Binary | 41% | Easy | |
| 0066 | Plus One | 41% | Easy | |
| 0065 | Valid Number | 14% | Hard | |
| 0064 | Minimum Path Sum | 49% | Medium | |
| 0063 | Unique Paths II | 33% | Medium | |
| 0062 | Unique Paths | 49% | Medium | |
| 0061 | Rotate List | 28% | Medium | |
| 0060 | Permutation Sequence | 34% | Medium | |
| 0059 | Spiral Matrix II | 49% | Medium | |
| 0058 | Length of Last Word | 32% | Easy | |
| 0057 | Insert Interval | 32% | Hard | |
| 0056 | Merge Intervals | 37% | Medium | |
| 0055 | Jump Game | 32% | Medium | |
| 0054 | Spiral Matrix | 31% | Medium | |
| 0053 | Maximum Subarray | 44% | Easy | |
| 0052 | N-Queens II | 54% | Hard | |
| 0051 | N-Queens | 42% | Hard | |
| 0050 | Pow(x, n) | 28% | Medium | |
| 0049 | Group Anagrams | 50% | Medium | |
| 0048 | Rotate Image | 51% | Medium | |
| 0047 | Permutations II | 42% | Medium | |
| 0046 | Permutations | 58% | Medium | |
| 0045 | Jump Game II | 29% | Hard | |
| 0044 | Wildcard Matching | 23% | Hard | |
| 0043 | Multiply Strings | 31% | Medium | |
| 0042 | Trapping Rain Water | 45% | Hard | |
| 0041 | First Missing Positive | 30% | Hard | |
| 0040 | Combination Sum II | 44% | Medium | |
| 0039 | Combination Sum | 51% | Medium | |
| 0038 | Count and Say | 42% | Easy | |
| 0037 | Sudoku Solver | 39% | Hard | |
| 0036 | Valid Sudoku | 45% | Medium | |
| 0035 | Search Insert Position | 41% | Easy | |
| 0034 | Find First and Last Position of Element in Sorted Array | 34% | Medium | |
| 0033 | Search in Rotated Sorted Array | 33% | Medium | |
| 0032 | Longest Valid Parentheses | 26% | Hard | |
| 0031 | Next Permutation | 31% | Medium | |
| 0030 | Substring with Concatenation of All Words | 24% | Hard | |
| 0029 | Divide Two Integers | 16% | Medium | |
| 0028 | Implement strStr() | 33% | Easy | |
| 0027 | Remove Element | 45% | Easy | |
| 0026 | Remove Duplicates from Sorted Array | 42% | Easy | |
| 0025 | Reverse Nodes in k-Group | 38% | Hard | |
| 0024 | Swap Nodes in Pairs | 46% | Medium | |
| 0023 | Merge k Sorted Lists | 36% | Hard | |
| 0022 | Generate Parentheses | 57% | Medium | |
| 0021 | Merge Two Sorted Lists | 49% | Easy | |
| 0020 | Valid Parentheses | 37% | Easy | |
| 0019 | Remove Nth Node From End of List | 34% | Medium | |
| 0018 | 4Sum | 31% | Medium | |
| 0017 | Letter Combinations of a Phone Number | 43% | Medium | |
| 0016 | 3Sum Closest | 45% | Medium | |
| 0015 | 3Sum | 25% | Medium | |
| 0014 | Longest Common Prefix | 34% | Easy | |
| 0013 | Roman to Integer | 53% | Easy | |
| 0012 | Integer to Roman | 52% | Medium | |
| 0011 | Container With Most Water | 47% | Medium | |
| 0010 | Regular Expression Matching | 25% | Hard | |
| 0009 | Palindrome Number | 45% | Easy | |
| 0008 | String to Integer (atoi) | 14% | Medium | |
| 0007 | Reverse Integer | 25% | Easy | |
| 0006 | ZigZag Conversion | 33% | Medium | |
| 0005 | Longest Palindromic Substring | 28% | Medium | |
| 0004 | Median of Two Sorted Arrays | 27% | Hard | |
| 0003 | Longest Substring Without Repeating Characters | 29% | Medium | |
| 0002 | Add Two Numbers | 32% | Medium | |
| 0001 | Two Sum | 44% | Easy | |
