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Dear LeetCoders! For a better LeetCode problem-solving experience, please visit websiteleetcoder.net: Dare to claim the best practices of LeetCode solutions! Will save you a lot of time!

Hi there! I'm Lane.Do you feel that there are too many problems (over 3,450) on the LeetCode and you can't finish them all?Or do you forget how to solve the problems you did last time?If you can master some solution patterns, this will happen less often.

Here, I will provide you withcommon problem-solving patterns so that you don't waste time on problems that are not often tested in interviews.

Solutions for languages such asPython, C++, Java, JavaScript, C#, Go, Ruby, etc. will also be provided. If you have better solutions, welcome to create an issue or PR!

I have planned a learning route for you. You just need to do the problems in the order they are listed.You can skip the more difficult problems and do them later.

• 344. Reverse String was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 27. Remove Element was solved inPython, Java, C++, JavaScript, C#, Go, Ruby and2 ways.
• 704. Binary Search was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 977. Squares of a Sorted Array was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 209. Minimum Size Subarray Sum was solved inPython, Java, JavaScript, C#.
• 303. Range Sum Query - Immutable was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 59. Spiral Matrix II was solved inPython, Java, JavaScript, C#.
• 503. Next Greater Element II was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.

• 203. Remove Linked List Elements was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 206. Reverse Linked List was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 160. Intersection of Two Linked Lists was solved inPython, Java, JavaScript, C#.
• 19. Remove Nth Node From End of List was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 707. Design Linked List was solved inPython, Java, JavaScript, C#.
• 24. Swap Nodes in Pairs was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.

• 349. Intersection of Two Arrays was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 242. Valid Anagram was solved inPython, Java, JavaScript, C#.
• 1. Two Sum was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 383. Ransom Note was solved inPython, Java, JavaScript, C#.
• 202. Happy Number was solved inPython, Java, JavaScript, C#.
• 454. 4Sum II was solved inPython, Java, JavaScript, C#, Ruby.

• 28. Find the Index of the First Occurrence in a String was solved inPython, JavaScript.
• 541. Reverse String II was solved inPython, Java, JavaScript, C#, Ruby.
• 459. Repeated Substring Pattern was solved inPython, JavaScript.

• 15. 3Sum was solved inPython and 2 ways.
• 18. 4Sum was solved inPython.

• 20. Valid Parentheses was solved inPython, JavaScript.
• 232. Implement Queue using Stacks was solved inPython, JavaScript.

• 225. Implement Stack using Queues was solved inPython, JavaScript and 3 ways.

• 509. Fibonacci Number was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.

• 198. House Robber was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 213. House Robber II was solved inPython, JavaScript, Go.
• 337. House Robber III was solved inPython, JavaScript, Go and2 ways.

• 416. Partition Equal Subset Sum was solved inPython, Java, C++, JavaScript, C#, Go, Ruby and2 ways.
• 1049. Last Stone Weight II was solved inPython, Java, C++, JavaScript, C#, Go, Ruby and2 ways.
• 494. Target Sum was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 474. Ones and Zeroes was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.

• 518. Coin Change II was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 377. Combination Sum IV was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 322. Coin Change was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 279. Perfect Squares was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 139. Word Break was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.

• 121. Best Time to Buy and Sell Stock was solved inPython, JavaScript, Go.
• 122. Best Time to Buy and Sell Stock II was solved inPython, JavaScript, Go.
• 714. Best Time to Buy and Sell Stock with Transaction Fee was solved inPython, JavaScript, Go.
• 123. Best Time to Buy and Sell Stock III was solved inPython, JavaScript, Go.
• 188. Best Time to Buy and Sell Stock IV was solved inPython, JavaScript, Go.
• 309. Best Time to Buy and Sell Stock with Cooldown was solved inPython, JavaScript, Go.

• 674. Longest Continuous Increasing Subsequence was solved inPython, Java, JavaScript, C#.
• 300. Longest Increasing Subsequence was solved inPython, Java, JavaScript, C#.
• 718. Maximum Length of Repeated Subarray was solved inPython, Java, JavaScript, C#.
• 1143. Longest Common Subsequence was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 1035. Uncrossed Lines was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 53. Maximum Subarray was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 392. Is Subsequence was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 583. Delete Operation for Two Strings was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 72. Edit Distance was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.

• 739. Daily Temperatures was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 496. Next Greater Element I was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 42. Trapping Rain Water was solved in _Python, Java, C++, JavaScript, C#, Go, Ruby.
• 84. Largest Rectangle in Histogram was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.

• 797. All Paths From Source to Target was solved inPython, Java, C++, JavaScript, C#, Go, Ruby and2 ways.
• 200. Number of Islands was solved inPython, Java, C++, JavaScript, C#, Go, Ruby and3 ways.
• 463. Island Perimeter was solved inPython and2 ways.
• 695. Max Area of Island was solved inPython, Java, C++, JavaScript, C#, Go, Ruby and3 ways.
• 827. Making A Large Island was solved inPython and2 ways.
• 127. Word Ladder was solved inPython.
• 1971. Find if Path Exists in Graph was solved inPython, Java, C++, JavaScript, C#, Go, Ruby and 2 ways.
• 684. Redundant Connection was solved inPython, Java, C++, JavaScript, C#, Go, Ruby.
• 685. Redundant Connection II was solved inPython.
• 1584. Min Cost to Connect All Points was solved inPython, Java, C++, JavaScript, C#, Go, Ruby and 2 ways.
• 207. Course Schedule was solved inPython, Java, C++, C# and 2 ways.
• 1514. Path with Maximum Probability was solved inPython and 2 ways.
• 752. Open the Lock was solved inPython and 2 ways.
• 743. Network Delay Time was solved inPython and 2 ways.
• 787. Cheapest Flights Within K Stops was solved inPython.
• 1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance was solved inPython.

• 433. Minimum Genetic Mutation was solved inPython and 3 ways.

More LeetCode problems will be added soon.