The gray code is a binary numeral system where two successive values differ in only one bit.
Given a non-negative integer n representing the total number o……
Given an unsorted array of integers, find the length of the longest consecutive elements sequence.
Given [100, 4, 200, 1, 3, 2],
Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the differen……