739

class Solution {
public:
    vector<int> dailyTemperatures(vector<int>& T) {
        int sz = T.size();
        stack< pair<int, int> > s;
        vector<int> ans(sz,0);

        for(int i=0; i<sz; i++){
            while(!s.empty() && s.top().first < T[i]){
                pair<int, int> tmp = s.top();
                s.pop();
                ans[tmp.second] = i-tmp.second;
            }
            s.push(make_pair(T[i], i));
        }
        return ans;
    }
};