# Daily Temperatures

medium

Given a list of daily temperatures `T`, 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

``````T = [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]`.
```class Solution {
public int[] dailyTemperatures(int[] T) {

int n = T.length;
int[] result = new int[n];
Stack<Integer> stack = new Stack<>();
for(int i = n-1 ; i >= 0 ; i--){
int cur_temp = T[i];
while(!stack.isEmpty() && cur_temp >= T[stack.peek()]){
stack.pop();
}
result[i] = stack.isEmpty() ? 0 : stack.peek() - i;
stack.push(i);
}
return result;
}
}
```

The ouput of the given array will be calculated as:

`````` T = [73, 74, 75, 71, 69, 72, 76, 73]
[1,  1,  4,  2,  1,  1,   0,  0]``````

Categories: Stack