Medium
Given an array temperatures, return an array answer where answer[i] is the number of days you must wait after day i for a warmer temperature. If none, put 0.
Input: temperatures = [73,74,75,71,69,72,76,73] Output: [1,1,4,2,1,1,0,0]
Input: temperatures = [30,40,50,60] Output: [1,1,1,0]