highmaple的博客

Design a data structure that supports all following operations in average O(1) time.   insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the ...

Two Sum Category Difficulty Likes Dislikes algorithms Easy (43.81%) 10587 350 Tags Companies Given an array of integers, return indices of the two numbers such that they add up to a specific target. Y...

Add Two Numbers Category Difficulty Likes Dislikes algorithms Medium (31.66%) 5950 1551 Tags Companies You are given two non-empty linked lists representing two non-negative integers. The digits are s...