超级初心者

You are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of substring(s) in s that…

You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). You have to rotate the image in-place, …

Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,1,2,4,5,6,7] might become [4,5,6,7…

Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is…

Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c + d = target? Find a…

Given an array nums of n integers and an integer target, find three integers in nums such that the sum is closest to target. Return the sum…

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap aft…

Given n non-negative integers a1, a2, ..., an , where each represents a point at coordinate (i, ai). n vertical lines are drawn such that t…

The printer can only print a sequence of the same character each time. At each turn, the printer can print new characters starting from and…