题目 Given an unsorted integer array, find the first missing positive inte...

题目 The count-and-say sequence is the sequence of integers beginning as f...

题目 Given a sorted array and a target value, return the index if the targ...

题目 Given a linked list, reverse the nodes of a linked list k at a time a...

题目 Given an array S of n integers, find three integers in S such that th...

题目 Given an array S of n integers, are there elements a, b, c, and d in ...

题目 There are N children standing in a line. Each child is assigned a rat...

题目 Given a 2D matrix matrix, find the sum of the elements inside the rec...

题目 Given an integer array nums, find the sum of the elements between ind...