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Longest Substring Without Repeating Characters Medium 8259 500 Add to List Share Given a string, find the length of the longest substring without repeating characters. Example 1: Input: “abcabcbb” O...

Combination Sum IV Medium Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target. Example: nums = [1, 2...

Triangle Medium Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [2], [3,4], [...

Unique Paths II Medium A robot is located at the top-left corner of a m x n grid (marked ‘Start’ in the diagram below). The robot can only move either down or right at any point in time. The robot i...