Problem Database

Last updated: 26 February 2025

Name			Tags
Two Sum	Easy	100%	Array Hash Table
Merge Strings Alternately	Easy	80%	Two Pointers String
Create Hello World Function	Easy	77%
Longest Substring Without Repeating Characters	Medium	73%	Hash Table String Sliding Window
Add Two Numbers	Medium	71%	Linked List Math Recursion
Merge Sorted Array	Easy	71%	Array Two Pointers Sorting
Median of Two Sorted Arrays	Hard	67%	Array Binary Search Divide and Conquer
The Earliest Moment When Everyone Become Friends	Medium	67%	Array Union Find Sorting
Zero Array Transformation I	Medium	67%	Array Prefix Sum
Zero Array Transformation III	Medium	67%	Array Greedy Sorting Heap (Priority Queue) Prefix Sum
Merge Intervals	Medium	65%	Array Sorting
Climbing Stairs	Easy	65%	Math Dynamic Programming Memoization
Number of Islands	Medium	63%	Array Depth-First Search Breadth-First Search Union Find Matrix
Palindrome Number	Easy	60%	Math
Maximum Subarray	Medium	60%	Array Divide and Conquer Dynamic Programming
Move Pieces to Obtain a String	Medium	60%	Two Pointers String
Continuous Subarrays	Medium	60%	Array Queue Sliding Window Heap (Priority Queue) Ordered Set Monotonic Queue
Maximum Beauty of an Array After Applying Operation	Medium	60%	Array Binary Search Sliding Window Sorting
Next Permutation	Medium	56%	Array Two Pointers
Sqrt(x)	Easy	56%	Math Binary Search

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