Given an array of integers `temperatures` representing daily temperatures, return an array `answer` such that `answer[i]` is the number of days until a warmer temperature. If no warmer day ahead, `answer[i] = 0`.
temperatures = [73,74,75,71,69,72,76,73][1,1,4,2,1,1,0,0]temperatures = [30,40,50,60][1,1,1,0]