LeetCode 739. Daily temperature

739. Daily temperature

【 Monotonic stack 】

class Solution {

    //  Monotonic stack  10:18 42

    public int[] dailyTemperatures(int[] temperatures) {
        Deque<Integer> stack = new LinkedList();
        int[] t = temperatures;
        int n = t.length;
        int[] ans = new int[n];
        for (var i = n - 1; i >= 0; i--) {
            while (!stack.isEmpty() && t[stack.peek()] <= t[i]) {
                stack.pop();
            }
            if (stack.isEmpty()) {
                ans[i] = 0;       
            } else {
                ans[i] = stack.peek() - i;
            }
            stack.push(i);
        }
        return ans;
    }
}