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].
Notes:
T = [73, 74, 75, 71, 69, 72, 76, 73]
S = []
O = [ 0, 0, 0, 0, 0, 0, 0, 0]
Solution:
class Solution {
public int[] dailyTemperatures(int[] input) {
Stack<Integer> stack = new Stack<>();
int[] output = new int[input.length];
for (int i = input.length - 1; i >= 0; i--) {
int current = input[i];
while (!stack.empty() && (input[stack.peek()] <= current)) {
stack.pop();
}
output[i] = stack.empty() ? 0: stack.peek() - i;
stack.add(i);
}
return output;
}
}