Solving the Single Number and Climbing Stairs Coding Challenge
Too Long; Didn't ReadSergei Golitsyn: Given a non-empty array of integers, every element appears*twice*except for one. Find a solution with a linear runtime complexity and use only constant extra space. Use a bit operation to solve problems such as climbing a staircase. The solution is a dynamic programming (DP) problem that can be a problem with dynamic programming. Use XOR(1) operations to solve a problem such as a staircase problem. Find out how many distinct ways you can climb 1 or 2 steps to the top.