| 1 | Two Sum | Easy |   |
| 7 | Reverse Integer | Easy | |
| 9 | PalindromeNumber | Easy | |
| 13 | Roman To Integer | Easy | |
| 14 | Longest Common Prefix | Easy | |
| 20 | ValidParentheses | Easy | |
| 21 | Merge 2 Sorted Lists | Easy | |
| 26 | Remove Duplicates From Sorted Array | Easy | |
| 27 | Remove Element | Easy | |
| 28 | Needle in Haystack | Easy | |
| 35 | Search Inserted Position | Easy | |
| 38 | Count and Say | Easy | |
| 53 | Maximum SubArray | Easy | |
| 58 | Length of Last Word | Easy | |
| 66 | Plus One | Easy | |
| 67 | Add Binary | Easy | |
| 69 | Sqrt(x) | Easy | |
| 70 | Climbing Stairs | Easy | |
| 83 | Remove Duplicates from Sorted List | Easy | |
| 88 | Merge Sorted Array | Easy | |
| 100 | Same Tree | Easy | |
| 101 | Symmetric Tree | Easy | |
| 104 | Maximum Depth of Binary Tree | Easy | |
| 107 | Binary Tree Level Order Traversal II | Easy | |
| 108 | Convert Sorted Array To Binary Search Tree | Easy | |
| 110 | Balanced Binary Tree | Easy | |
| 111 | Minimum Depth of Binary Tree | Easy | |
| 112 | Path Sum | Easy | |
| 118 | Pascal's Triangle | Easy | |
| 119 | Pascal's Triangle II | Easy | |
| 121 | Best Time to Buy and Sell Stocks | Easy | |
| 122 | Best Time to Buy and Sell Stocks II | Easy | |
| 125 | Valid Palindrome | Easy | |
| 136 | Single Number | Easy | |
| 141 | Linked List Cycle | Easy | |
| 155 | Min Stack | Easy | |
| 157 | Read N Characters Given Read4 | Easy | |
| 160 | Intersection of Two Linked Lists | Easy | |
| 167 | Two Sum II - Input Array is Sorted | Easy | |
| 168 | Excel Sheet Column Title | Easy | |
| 169 | Majority Element | Easy | |
| 170 | Two Sum III - Data Structure Design | Easy | |
| 171 | Excel Sheet Column Number | Easy | |
| 172 | Factoring Trailing Zeroes | Easy | |
| 189 | Rotate Array | Easy | |
| 190 | Reverse Bits | Easy | |
| 191 | Number of One Bits | Easy | |
| 198 | House Robber | Easy | |
| 202 | Happy Number | Easy | |
| 203 | Remove Linked List Elements | Easy | |
| 204 | Count Primes | Easy | |
| 205 | Isomorphic Strings | Easy | |
| 206 | Reverse Linked Lists | Easy | |
| 217 | Contains Duplicate | Easy | |
| 219 | Contains Duplicate II | Easy | |
| 225 | Implement Stack using Queues | Easy | |
| 226 | Invert Binary Tree | Easy | |
| 231 | Power of Two | Easy | |
| 232 | Implement Queue Using Stacks | Easy | |
| 234 | Palindrome Linked Lists | Easy | |
| 235 | Lowest Common Ancestor of a Binary Search Tree | Easy | |
| 237 | Delete a Node In A Linked List | Easy | |
| 242 | Valid Anagram | Easy | |
| 243 | Shortest Word Distance | Easy | |
| 246 | Strobogramatic Number | Easy | |
| 252 | Meeting Rooms | Easy | |
| 256 | Paint House | Easy | |
| 257 | Binary Tree Paths | Easy | |
| 258 | Add Digits | Easy | |
| 263 | Ugly Number | Easy | |
| 266 | Palindrome Permutation | Easy | |
| 268 | Missing Number | Easy | |
| 270 | Closest Binary Search Tree Value | Easy | |
| 276 | Paint Fence | Easy | |
| 278 | First Bad Version | Easy | |
| 283 | Move Zeroes | Easy | |
| 290 | Word Pattern | Easy | |
| 292 | Nim Game | Easy | |
| 293 | Flip Game | Easy | |
| 299 | Bulls and Cows | Easy | |
| 303 | Range Sum Query - Immutable | Easy | |
| 326 | Power of Three | Easy | |
| 339 | Nested List Weight Sum | Easy | |
| 342 | Power of Four | Easy | |
| 344 | Reverse A String | Easy | |
| 345 | Reverse Vowels of A String | Easy | |
| 346 | Moving Average From Data Stream | Easy | |
| 349 | Intersection of 2 Arrays | Easy | |
| 350 | Intersection of 2 Arrays II | Easy | |
| 359 | Logger Rate Limiter | Easy | |
| 367 | Valid Perfect Square | Easy | |
| 374 | Guess Number Higher or Lower | Easy | |
| 383 | Ransom Note | Easy | |
| 387 | First Unique Character in String | Easy | |
| 389 | Find the Difference | Easy | |
| 392 | Is Subsequence | Easy | |
| 401 | Binary Watch | Easy | |
| 404 | Sum of Left Leaves | Easy | |
| 405 | Convert a Number to Hexadecimal | Easy | |
| 408 | Valid Word Abbreviation | Easy | |
| 409 | Longest Palindrome | Easy | |
| 412 | Fizz Buzz | Easy | |
| 414 | Third Maximum Number | Easy | |
| 415 | Add Strings | Easy | |
| 422 | Valid Word Square | Easy | |
| 434 | Number of Segments in a String | Easy | |
| 441 | Arranging Coins | Easy | |
| 443 | String Compression | Easy | |
| 447 | Number of Boomerangs | Easy | |
| 448 | Find All Numbers Disappeared in an Array | Easy | |
| 453 | Minimum Moves to Equal Array Elements | Easy | |
| 455 | Assign Cookies | Easy | |
| 459 | Repeated Substring Pattern | Easy | |
| 461 | Hamming Distance | Easy | |
| 463 | Island Perimeter | Easy | |
| 475 | Heaters | Medium | |
| 476 | Number Complement | Easy | |
| 482 | License Key Formatting | Easy | |
| 485 | Max Consecutive Ones | Easy | |
| 492 | Construct the Rectangle | Easy | |
| 496 | Next Greater Element I | Easy | |
| 500 | Keyboard Row | Easy | |
| 501 | Find Mode in Binary Search Tree | Easy | |
| 504 | Base 7 | Easy | |
| 506 | Relative Ranks | Easy | |
| 507 | Perfect Number | Easy | |
| 509 | Fibonacci Number | Easy | |
| 520 | Detect Capital | Easy | |
| 521 | Longest Uncommon Subsequence I | Easy | |
| 530 | Minimum Absolute Difference in BST | Easy | |
| 532 | K - Diff Pairs in Array | Easy | |
| 538 | Convert BST to Greater Tree | Easy | |
| 541 | Reverse String II | Easy | |
| 543 | Diameter of Binary Tree | Easy | |
| 551 | Student Attendance Record I | Easy | |
| 557 | Reverse Words in a String III | Easy | |
| 559 | Maximum Depth of N-Ary Tree | Easy | |
| 561 | Array Partition I | Easy | |
| 563 | Binary Tree Tilt | Easy | |
| 566 | Reshape The Matrix | Easy | |
| 572 | Subtree of Another Tree | Easy | |
| 575 | Distribute Candies | Easy | |
| 581 | Shortest Unsorted Continuous Subarray | Easy | |
| 589 | N-Ary Tree Preorder Traversal | Easy | |
| 590 | N-Ary Tree Postorder Traversal | Easy | |
| 594 | Longest Harmonious Subsequence | Easy | |
| 598 | Range Addition II | Easy | |
| 599 | Minimum Index Sum of 2 Lists | Easy | |
| 604 | Design Compressed String Iterator | Easy | |
| 605 | Can Place Flowers | Easy | |
| 606 | Construct String from Binary Tree | Easy | |
| 617 | Merge Two Binary Trees | Easy | |
| 624 | Maximum Distance in Arrays | Easy | |
| 628 | Maximum Product of Three Numbers | Easy | |
| 633 | Sum Square Numbers | Easy | |
| 637 | Average of Levels in Binary Tree | Easy | |
| 643 | Maximum Average SubArray I | Easy | |
| 645 | Set Mismatch | Easy | |
| 653 | Two Sum IV - Input is a BST | Easy | |
| 657 | Robot Return to Origin | Easy | |
| 661 | Image Smoother | Easy | |
| 665 | Non Deceasing Array | Easy | |
| 669 | Trim a Binary Search Tree | Easy | |
| 671 | Second Minimum Node in Binary Tree | Easy | |
| 674 | Longest Continuous Increasing Subsequence | Easy | |
| 680 | Valid Palindrome II | Easy | |
| 682 | Baseball Game | Easy | |
| 686 | Repeated String Match | Easy | |
| 687 | Longest Univalue Path | Easy | |
| 690 | Employee Importance | Easy | |
| 693 | Binary Number with Alternating Bits | Easy | |
| 696 | Count Binary Substrings | Easy | |
| 697 | Degree of an Array | Easy | |
| 700 | Search in a Binary Search Tree | Easy | |
| 703 | Kth Largest Element in a Stream | Easy | |
| 704 | Binary Search | Easy | |
| 705 | Design HashSet | Easy | |
| 706 | Design HashMap | Easy | |
| 709 | To Lower Case | Easy | |
| 716 | Max Stack | Easy | |
| 717 | 1-bit and 2-bit Characters | Easy | |
| 720 | Longest Word in Dictionary | Easy | |
| 724 | Find Pivot Index | Easy | |
| 728 | Self Dividing Numbers | Easy | |
| 733 | Flood Fill | Easy | |
| 734 | Sentence Similarity | Easy | |
| 744 | Find Smallest Letter Greater Than Target | Easy | |
| 746 | Min Cost Climbing Stairs | Easy | |
| 747 | Largest Number at least twize of Others | Easy | |
| 748 | Shortest Completing Word | Easy | |
| 758 | Bold Words in String | Easy | |
| 760 | Find Anagram Mappings | Easy | |
| 762 | Prime Number of Set Bits in Primary Representation | Easy | |
| 766 | Toeplitz Matrix | Easy | |
| 771 | Jewels and Stones | Easy | |
| 783 | Minimum Distance Between BST Nodes | Easy | |
| 788 | Rotated Digits | Easy | |
| 796 | Rotate String | Easy | |
| 800 | Similar RGB Color | Easy | |
| 804 | Unique Morse Code Words | Easy | |
| 806 | Number of Lines to Write String | Easy | |
| 811 | Subdomain Visit Count | Easy | |
| 812 | Largest Triangle Area | Easy | |
| 819 | Most Common Word | Easy | |
| 821 | Shortest Distance to Character | Easy | |
| 824 | Goat Latin | Easy | |
| 830 | Positions of Large Groups | Easy | |
| 832 | Flipping an Image | Easy | |
| 836 | Rectangle Overlap | Easy | |
| 840 | Magic Squares in Grid | Easy | |
| 844 | Backspace String Compare | Easy | |
| 849 | Maximize Distance to Closest Person | Easy | |
| 852 | Peak Index in Mountain Array | Easy | |
| 859 | Buddy Strings | Easy | |
| 860 | Lemonade Change | Easy | |
| 867 | Transpose Matrix | Easy | |
| 868 | Binary Gap | Easy | |
| 872 | Leaf-Similar Trees | Easy | |
| 874 | Walking Robot Simulation | Easy | |
| 876 | Middle of the Linked List | Easy | |
| 883 | Projection Area of 3D Shapes | Easy | |
| 884 | Uncommon Words from 2 Sentences | Easy | |
| 888 | Fair Candy Swap | Easy | |
| 892 | Surface Area of 3D Shapes | Easy | |
| 893 | Groups of Special Equivalent Strings | Easy | |
| 896 | Monotonic Array | Easy | |
| 897 | Increasing Order Search Tree | Easy | |
| 905 | Sort Array by Parity | Easy | |
| 908 | Smallest Range I | Easy | |
| 914 | X of a kind in a Deck of Cards | Easy | |
| 917 | Reverse Only Letters | Easy | |
| 922 | Sort Array by Parity II | Easy | |
| 925 | Long Pressed Name | Easy | |
| 929 | Unique Email Addresses | Easy | |
| 933 | Number of Recent Calls | Easy | |
| 937 | Reorder Data In Log Files | Easy | |
| 938 | Range Sum of BST | Easy | |
| 941 | Valid Mountain Array | Easy | |
| 942 | DI String Match | Easy | |
| 944 | Delete Columns to Make Sorted | Easy | |
| 949 | Largest Time for Given Digits | Easy | |
| 953 | Verifying an Alien Dictionary | Easy | |
| 961 | N-Repeated Elements in Size 2N Array | Easy | |
| 965 | Univalued Binary Tree | Easy | |
| 970 | Powerful Integers | Easy | |
| 976 | Largest Perimeter Triangle | Easy | |
| 977 | Squares of a Sorted Array | Easy | |
| 985 | Sum of Even Numbers after Queries | Easy | |
| 989 | Add to Array Form of Integer | Easy | |
| 993 | Cousins in Binary Tree | Easy | |
| 997 | Find the Town Judge | Easy | |
| 999 | Available Captures for Rook | Easy | |
| 1002 | Find Common Characters | Easy | |
| 1005 | Maximize Sum of Array After K Negations | Easy | |
| 1009 | Complement of Base 10 Integer | Easy | |
| 1010 | Pairs of Songs With Total Durations Divisible by 60 | Easy | |
| 1013 | Partition Array into Three Parts with equal Sum | Easy | |
| 1018 | Binary Prefix Divisible by 5 | Easy | |
| 1021 | Remove Outermost Parenthesis | Easy | |
| 1022 | Sum of Root to Leaf Binary Numbers | Easy | |
| 1025 | Divisor Game | Easy | |
| 1029 | Two City Scheduling | Easy | |
| 1030 | Matrix Cells in Distance Order | Easy | |
| 1033 | Moving Stones Until Consecutive | Easy | |
| 1037 | Valid Boomerang | Easy | |
| 1042 | Flower Planting with no Adjacent | Easy | |
| 1046 | Last Stone Weight | Easy | |
| 1047 | Remove All adjacent Duplicates in String | Easy | |
| 1051 | Height Checker | Easy | |
| 1056 | Confusing Number | Easy | |
| 1064 | Fixed Point | Easy | |
| 1065 | Index Pairs of a String | Easy | |
| 1071 | Greatest Common Divisors of Strings | Easy | |
| 1078 | Occurrence After Bigram | Easy | |
| 1085 | Sum of Digits in Minimum Number | Easy | |
| 1086 | High Five | Easy | |
| 1089 | Duplicate Zeroes | Easy | |
| 1099 | Two Sum Less Than K | Easy | |
| 1103 | Distribute Candies to People | Easy | |
| 1108 | Defanging an IP Address | Easy | |
| 1118 | Number of Days in a Month | Easy | |
| 1119 | Remove Vowels From String | Easy | |
| 1122 | Relative Sort Array | Easy | |
| 1128 | Number of Equivalent Domino Pairs | Easy | |
| 1133 | Largest Unique Number | Easy | |
| 1134 | Armstrong Number | Easy | |
| 1137 | Nth Tribonacci Number | Easy | |
| 1150 | Check if Number is Majority Element in Sorted Array | Easy | |
| 1154 | Day of The Year | Easy | |
| 1160 | Find Words That Can Be Formed By Characters | Easy | |
| 1165 | Single Row Keyboard | Easy | |
| 1170 | Compare Strings By Frequency of the Smallest Character | Easy | |
| 1175 | Prime Arrangements | Easy | |
| 1176 | Diet Plan Performance | Easy | |
| 1180 | Count Substrings with only one Distinct Letter | Easy | |
| 1184 | Distance Between Bus Stops | Easy | |
| 1185 | Day of the Week | Easy | |
| 1189 | Maximum Number of Balloons | Easy | |
| 1196 | How Many Apples Can You Put into the Basket | Easy | |
| 1200 | Minimum Absolute Difference | Easy | |
| 1207 | Unique Number of Occurrences | Easy | |
| 1213 | Intersection of Three Sorted Arrays | Easy | |
| 1217 | Play With Chips | Easy | |
| 1221 | Split A String In Balanced Strings | Easy | |
| 1228 | Missing A Number In Arithmetic Progression | Easy | |
| 1232 | Check If It Is A Straight Line | Easy | |
| 1237 | Find Positive Integer Solutions for a Given Equation | Easy | |
| 1243 | Array Transformation | Easy | |
| 1252 | Cells With Odd Values In Matrix | Easy | |
| 1260 | Shift 2D Grid | Easy | |
| 1266 | Minimum Time Visiting All Points | Easy | |
| 1271 | Hexspeak | Easy | |
| 1275 | Find Winner On a Tic Tac Toe Game | Easy | |
| 1281 | Subtract the Product and Sum of Digits of a Integer | Easy | |
| 1287 | Element Appearing More Than 25% in Sorted Array | Easy | |
| 1290 | Convert Binary Number In A Linked List to Integer | Easy | |
| 1295 | Find Numbers With Even Numbers of Digits | Easy | |
| 1299 | Replace Elements With Greatest Element on Right Side | Easy | |
| 1304 | Find N Unique Integers Sum Up To Zero | Easy | |
| 1309 | Decrypt String From Alphabet To Integer Mapping | Easy | |
| 1313 | Decompress Run-Length Encoded Strings | Easy | |
| 1317 | Convert Integer to Sum Of Two Non-Zero Integers | Easy | |
| 1323 | Maximum 69 Number | Easy | |
| 1331 | Rank Transform of An Array | Easy | |
| 1332 | Remove Palindromic Subsequences | Easy | |
| 1337 | The K Weakest Rows In A Matrix | Easy | |
| 1342 | Number of Steps to Reduce a Number to Zero | Easy | |
| 1346 | Check if N and It's Double Exist | Easy | |
| 1351 | Count Negative Numbers In A Sorted Matrix | Easy | |
| 1356 | Sort Integers by Number of 1 Bits | Easy | |
| 1360 | Number of Days Between Two Dates | Easy | |
| 1365 | How Many Numbers Are Smaller Than Current Number | Easy | |
| 1370 | Increasing Decreasing String | Easy | |
| 1374 | Generate A String With Characters That Have Odd Count | Easy | |
| 1380 | Lucky Numbers In A Matrix | Easy | |
| 1385 | Find The Distance Value Between 2 Arrays | Easy | |
| 1389 | Create Target Array in Given Order | Easy | |
| 1394 | Find Lucky Integer In An Array | Easy | |
| 1399 | Count Largest Group | Easy | |
| 1403 | Minimum Subsequence in Non-Increasing Order | Easy | |
| 1408 | String Matching In An Array | Easy | |
| 1413 | Minimum Value To Get Positive Step By Step Sum | Easy | |
| 1417 | Reformat The String | Easy | |
| 1422 | Maximum Score After Splitting A String | Easy | |
| 1426 | Counting Elements | Easy | |
| 1427 | Performing String Shifts | Easy | |
| 1431 | Kids With The Greatest Number Of Candies | Easy | |
| 1436 | Destination City | Easy | |
| 1441 | Build An Array With Stack Operation | Easy | |
| 1446 | Consecutive Characters | Easy | |
| 1450 | Number of Students Doing Homework at Given Time | Easy | |
| 1455 | Check If Word Occurs as Prefix of any Word in Sentence | Easy | |
| 1460 | Make 2 Arrays Equal by Reversing Sub Arrays | Easy | |
| 1464 | Maximum Product of 2 Elements in Array | Easy | |
| 1469 | Find All Lonely Nodes | Easy | |
| 1470 | Shuffle The Array | Easy | |
| 1474 | Delete N Nodes After M Nodes In A Linked List | Easy | |
| 1475 | Final Prices With Special Discount in a Shop | Easy | |
| 1480 | Running Sum of 1D Array | Easy | |
| 1486 | XOR Operations in An Array | Easy | |
| 1491 | Average Salary Excluding the Minimum and Maximum Salary | Easy | |
| 1496 | Path Crossing | Easy | |
| 1502 | Can Make Arithmetic Progression From Sequence | Easy | |
| 1507 | Reformat Date | Easy | |
| 1512 | Number of Good Pairs | Easy | |
| 1518 | Water Bottles | Easy | |
| 1523 | Count Odd Numbers In Interval Range | Easy | |
| 1528 | Shuffle Strings | Easy | |
| 1534 | Count Good Triplets | Easy | |
| 1539 | Kth Missing Positive Number | Easy | |
| 1544 | Make The String Great | Easy | |
