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

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

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

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

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

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

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

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

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