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].
impl Solution {
pub fn daily_temperatures(t: Vec<i32>) -> Vec<i32> {
let mut stack = vec![];
let mut ret = vec![0; t.len()];
for i in (0..t.len()).rev() {
while stack.last().unwrap_or(&(101, 0)).0 <= t[i] {
stack.pop();
}
ret[i] = (stack.last().unwrap_or(&(0, i)).1 - i) as i32;
stack.push((t[i], i));
}
ret
}
}