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Daily Temperatures

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Question

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].

Solution

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/*
@param: int[]
@return: int[]
Algorithm: 单调栈    
*/
public int[] dailyTemperatures(int[] T) {
    Stack<Integer> stack = new Stack<>();
    
    int i = 0; 
    int[] res = new int[T.length];
    while (i < T.length) {
        while (!stack.isEmpty() && T[i] > T[stack.peek()]) {
            int temp = stack.pop();
            res[temp] = i - temp;
        }
        stack.push(i);
        i++;
    }
    return res;
}