Given a linked list, remove the nth node from the end of list and return its head.
Given an array S of n integers, find there elements a, b, c in S such that a + b + c = 0.
Given an array S of n integers, find three integers in S such that the sum is closest to a given number.
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.
Write an algorithm to determine if a number is "happy".
Given an array of n positive integers and a positive integer s, find the minimal length of a subarray of [...]
Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.
Find two vertical lines which form a container with x-axis , such that the container contains the most water.