# 739. Daily temperatures

Daily Temperatures - LeetCode

## Given a list of daily temperatures temperatures, return a list such that, for each day in the input, tells you how many days you would have to wait until a warmer temperature. If there is no future day for which this is possible, put 0 instead. For example, given the list of temperatures temperatures = [73, 74, 75, 71, 69, 72, 76, 73], your output should be [1, 1, 4, 2, 1, 1, 0, 0]. Note: The length of temperatures will be in the range [1, 30000]. Each temperature will be an integer in the range [30, 100].

• code
``````class Solution:
def dailyTemperatures(self, temperatures: List[int]) -> List[int]:
res =  * len(temperatures)
stack = []

for i, t in enumerate(temperatures):

while stack and t > temperatures[stack[-1]]:
lasti = stack.pop()
res[lasti] = i - lasti

stack.append(i)

return res
``````
• code O(N), O(1)
``````class Solution:
def dailyTemperatures(self, temperatures: List[int]) -> List[int]:
res =  * len(temperatures)
hottest = 0

for i in range(len(temperatures)-1, -1, -1):
if temperatures[i] >= hottest: # not only >
hottest = temperatures[i]
continue
day = 1
while temperatures[i + day] <= temperatures[i]:
day += res[i + day]

res[i] = day

return res
``````