Description
Given an array of integers temperatures represents the daily temperatures, return an array answer such that answer[i] is the number of days you have to wait after the ith day to get a warmer temperature. If there is no future day for which this is possible, keep answer[i] == 0 instead.
Example 1:
Input: temperatures = [73,74,75,71,69,72,76,73] Output: [1,1,4,2,1,1,0,0]
Example 2:
Input: temperatures = [30,40,50,60] Output: [1,1,1,0]
Example 3:
Input: temperatures = [30,60,90] Output: [1,1,0]
Constraints:
1 <= temperatures.length <= 10530 <= temperatures[i] <= 100
Solution
Python3
class Solution:
def dailyTemperatures(self, temperatures: List[int]) -> List[int]:
N = len(temperatures)
res = [0] * N
stack = []
for i, x in enumerate(temperatures):
while stack and x > temperatures[stack[-1]]:
j = stack.pop()
res[j] = i - j
stack.append(i)
return res