739. Daily Temperatures

Given a list of daily temperatures, produce a list 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 temperatures = [73, 74, 75, 71, 69, 72, 76, 73], your output should be [1, 1, 4, 2, 1, 1, 0, 0].

给一组数，对每个数寻找之后出现的较大值，并返回坐标差。

跟之前有一题比较像，用一个vector存一下还没找到较大值的数就行了。

class Solution {
public:
    vector<int> dailyTemperatures(vector<int>& temperatures) {
        vector<int> res(temperatures.size(), 0);
        vector<pair<int, int>> rec;
        for (int i=0; i<temperatures.size(); ++i) {
            while (!rec.empty() && (rec.back().first < temperatures[i])) {
                res[rec.back().second] = i - rec.back().second;
                rec.pop_back();
            }
            rec.push_back(make_pair(temperatures[i], i));
        }
        return res;
    }
};