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Commit71b9c4d

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Updated README.md (added 4 new problem solutions; added 29 existing problem solutions)
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‎README.md

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@@ -4,12 +4,13 @@ Dear LeetCoders! For a better LeetCode problem-solving experience, please visit
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Hi there! I'm Lane.
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Do you feel that there are too many problems (over 3,450) on the LeetCode and you can't finish them all?
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Or do you forget how to solve the problems you did last time?
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Or do you forget how to solve the problems you did last time?
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If you can master some solution patterns, this will happen less often.
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Here, I will provide you with**common problem-solving patterns** so that you don't waste time on problems that are not often tested in interviews.
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Solutions for languages such as**Python, C++, Java, JavaScript, C#, Go, Ruby**, etc. will alsobe provided. If you have better solutions, welcome to create an issue or PR!
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**Python, C++, Java, JavaScript, C#, Go, Ruby** languages' solutions are provided for every selected LeetCode problem. Other languages' solutions willbe provided in the future. If you have better solutions, welcome to create an issue or PR!
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##How to use this repo?
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@@ -21,51 +22,55 @@ You can skip the more difficult problems and do them later.
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-[27. Remove Element](en/1-1000/27-remove-element.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_ and**2** ways.
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-[704. Binary Search](en/1-1000/704-binary-search.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[977. Squares of a Sorted Array](en/1-1000/977-squares-of-a-sorted-array.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[209. Minimum Size Subarray Sum](en/1-1000/209-minimum-size-subarray-sum.md) was solved in_Python, Java, JavaScript, C#_.
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-[209. Minimum Size Subarray Sum](en/1-1000/209-minimum-size-subarray-sum.md) was solved in_Python, Java,C++,JavaScript, C#, Go, Ruby#_.
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-[303. Range Sum Query - Immutable](en/1-1000/303-range-sum-query-immutable.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[59. Spiral Matrix II](en/1-1000/59-spiral-matrix-ii.md) was solved in_Python, Java, JavaScript, C#_.
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-[59. Spiral Matrix II](en/1-1000/59-spiral-matrix-ii.md) was solved in_Python, Java,C++,JavaScript, C#, Go, Ruby_.
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-[503. Next Greater Element II](en/1-1000/503-next-greater-element-ii.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[3478. Choose K Elements With Maximum Sum](https://leetcoder.net/en/leetcode/3478-choose-k-elements-with-maximum-sum) was solved in_Python_.
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#Linked List
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-[203. Remove Linked List Elements](en/1-1000/203-remove-linked-list-elements.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[206. Reverse Linked List](en/1-1000/206-reverse-linked-list.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[160. Intersection of Two Linked Lists](en/1-1000/160-intersection-of-two-linked-lists.md) was solved in_Python, Java, JavaScript, C#_.
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-[160. Intersection of Two Linked Lists](en/1-1000/160-intersection-of-two-linked-lists.md) was solved in_Python, Java,C++,JavaScript, C#, Go, Ruby_.
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-[19. Remove Nth Node From End of List](en/1-1000/19-remove-nth-node-from-end-of-list.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[707. Design Linked List](en/1-1000/707-design-linked-list.md) was solved in_Python, Java, JavaScript, C#_.
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-[707. Design Linked List](en/1-1000/707-design-linked-list.md) was solved in_Python, Java,C++,JavaScript, C#, Go, Ruby#_.
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-[24. Swap Nodes in Pairs](en/1-1000/24-swap-nodes-in-pairs.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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#Hash Table
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-[349. Intersection of Two Arrays](en/1-1000/349-intersection-of-two-arrays.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[242. Valid Anagram](en/1-1000/242-valid-anagram.md) was solved in_Python, Java, JavaScript, C#_.
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-[242. Valid Anagram](en/1-1000/242-valid-anagram.md) was solved in_Python, Java,C++,JavaScript, C#, Go, Ruby_.
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-[1. Two Sum](en/1-1000/1-two-sum.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[383. Ransom Note](en/1-1000/383-ransom-note.md) was solved in_Python, Java, JavaScript, C#_.
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-[202. Happy Number](en/1-1000/202-happy-number.md) was solved in_Python, Java, JavaScript, C#_.
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-[454. 4Sum II](en/1-1000/454-4sum-ii.md) was solved in_Python, Java, JavaScript, C#, Ruby_.
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-[383. Ransom Note](en/1-1000/383-ransom-note.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[202. Happy Number](en/1-1000/202-happy-number.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[454. 4Sum II](en/1-1000/454-4sum-ii.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[49. Group Anagrams](https://leetcoder.net/en/leetcode/49-group-anagrams) was solved in_Python, Ruby_.
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#String
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-[28. Find the Index of the First Occurrence in a String](en/1-1000/28-find-the-index-of-the-first-occurrence-in-a-string.md) was solved in_Python, JavaScript_.
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-[541. Reverse String II](en/1-1000/541-reverse-string-ii.md) was solved in_Python, Java, JavaScript, C#, Ruby_.
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-[459. Repeated Substring Pattern](en/1-1000/459-repeated-substring-pattern.md) was solved in_Python, JavaScript_.
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-[28. Find the Index of the First Occurrence in a String](en/1-1000/28-find-the-index-of-the-first-occurrence-in-a-string.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[541. Reverse String II](en/1-1000/541-reverse-string-ii.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[459. Repeated Substring Pattern](en/1-1000/459-repeated-substring-pattern.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[833. Find And Replace in String](https://leetcoder.net/en/leetcode/833-find-and-replace-in-string) was solved in_Python_.
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#Two Pointers
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-[15. 3Sum](en/1-1000/15-3sum.md) was solved in_Python_ and 2 ways.
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-[18. 4Sum](en/1-1000/18-4sum.md) was solved in_Python_.
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-[15. 3Sum](en/1-1000/15-3sum.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_ and 2 ways.
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-[18. 4Sum](en/1-1000/18-4sum.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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#Stack
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-[20. Valid Parentheses](en/1-1000/20-valid-parentheses.md) was solved in_Python, JavaScript_.
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-[232. Implement Queue using Stacks](en/1-1000/232-implement-queue-using-stacks.md) was solved in_Python, JavaScript_.
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#Stack & Queue
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-[20. Valid Parentheses](en/1-1000/20-valid-parentheses.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[232. Implement Queue using Stacks](en/1-1000/232-implement-queue-using-stacks.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[225. Implement Stack using Queues](en/1-1000/225-implement-stack-using-queues.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_ and 3 ways.
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#Queue
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-[225. Implement Stack using Queues](en/1-1000/225-implement-stack-using-queues.md) was solved in_Python, JavaScript_and3 ways.
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#Binary Tree
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-[144. Binary Tree Preorder Traversal](en/1-1000/144-binary-tree-preorder-traversal.md) was solved in_Python_and2 ways.
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#Dynamic Programming
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##Basics
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##Easy Problems
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-[509. Fibonacci Number](en/1-1000/509-fibonacci-number.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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##House Robber
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-[198. House Robber](en/1-1000/198-house-robber.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[213. House Robber II](en/1-1000/213-house-robber-ii.md) was solved in_Python, JavaScript,Go_.
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-[337. House Robber III](en/1-1000/337-house-robber-iii.md) was solved in_Python, JavaScript,Go_ and**2** ways.
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-[213. House Robber II](en/1-1000/213-house-robber-ii.md) was solved in_Python,Java, C++,JavaScript,C#, Go, Ruby_.
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-[337. House Robber III](en/1-1000/337-house-robber-iii.md) was solved in_Python,Java, C++,JavaScript,C#, Go, Ruby_ and**2** ways.
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##Knapsack Problems
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###0/1 Knapsack
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-[583. Delete Operation for Two Strings](en/1-1000/583-delete-operation-for-two-strings.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[72. Edit Distance](en/1-1000/72-edit-distance.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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##Hard Problems
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-[3494. Find the Minimum Amount of Time to Brew Potions](https://leetcoder.net/en/leetcode/3494-find-the-minimum-amount-of-time-to-brew-potions) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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#Monotonic Stack
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-[739. Daily Temperatures](en/1-1000/739-daily-temperatures.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[496. Next Greater Element I](en/1-1000/496-next-greater-element-i.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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-[42. Trapping Rain Water](en/1-1000/42-trapping-rain-water.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby.
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-[84. Largest Rectangle in Histogram](en/1-1000/84-largest-rectangle-in-histogram.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_.
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#Graph Theory
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-[797. All Paths From Source to Target](en/1-1000/797-all-paths-from-source-to-target.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_ and**2** ways.
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-[200. Number of Islands](en/1-1000/200-number-of-islands.md) was solved in_Python, Java, C++, JavaScript, C#, Go, Ruby_ and**3** ways.

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