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Coding Problems and Solutions

Problem	Difficulty	Available Solutions
3Sum	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Add and Search Word	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Alien Dictionary	Hard	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Best Time to Buy and Sell Stock	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Binary Tree Level Order Traversal	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Binary Tree Maximum Path Sum	Hard	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Climbing Stairs	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Clone Graph	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Coin Change	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Combination Sum	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Construct Binary Tree from Preorder and Inorder Traversal	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Container With Most Water	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Contains Duplicate	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Counting Bits	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Course Schedule	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Decode Ways	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Detect Cycle in a Linked List	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Encode and Decode Strings	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Find Median from Data Stream	Hard	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Find Minimum in Rotated Sorted Array	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Graph Valid Tree	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Group Anagrams	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
House Robber	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
House Robber II	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Implement Trie (Prefix Tree)	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Insert Interval	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Invert Binary Tree	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Jump Game	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Kth Smallest Element in a BST	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Longest Common Subsequence	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Longest Consecutive Sequence	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Longest Increasing Subsequence	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Longest Palindromic Substring	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Longest Repeating Character Replacement	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Longest Substring Without Repeating Characters	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Lowest Common Ancestor of BST	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Maximum Depth of Binary Tree	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Maximum Product Subarray	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Maximum Subarray	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Meeting Rooms	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Meeting Rooms II	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Merge Intervals	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Merge K Sorted Lists	Hard	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Merge Two Sorted Lists	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Minimum Window Substring	Hard	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Missing Number	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Non-overlapping Intervals	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Number of 1 Bits	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Number of Connected Components in an Undirected Graph	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Number of Islands	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Pacific Atlantic Water Flow	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Palindromic Substrings	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Product of Array Except Self	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Remove Nth Node From End Of List	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Reorder List	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Reverse a Linked List	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Reverse Bits	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Rotate Image	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Same Tree	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Search in Rotated Sorted Array	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Serialize and Deserialize Binary Tree	Hard	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Set Matrix Zeroes	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Spiral Matrix	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Subtree of Another Tree	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Sum of Two Integers	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Top K Frequent Elements	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Two Sum	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Unique Paths	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Valid Anagram	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Validate Binary Search Tree	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Valid Palindrome	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Valid Parentheses	Easy	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Word Break Problem	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Word Search	Medium	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust
Word Search II	Hard	Python JavaScript Java Cpp Csharp TypeScript Ruby Go Swift Rust