739. Daily Temperatures - LeetCode

class Solution:
    def dailyTemperatures(self, temperatures: list[int]) -> list[int]:
        result = [0] * len(temperatures)
        stack = []
        for r in range(len(temperatures)):
            while stack and temperatures[stack[-1]] < temperatures[r]:  # l < r
                l = stack.pop()
                result[l] = r - l
            stack.append(r)
        return result