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739. Daily Temperatures

Difficulty Topics

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 <= 105
  • 30 <= temperatures[i] <= 100

Solution

daily-temperatures.py
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]]:
                prev = stack.pop()
                res[prev] = i - prev

            stack.append(i)

        return res