LeetCode 739. 每日温度

class Solution {
public:
    vector<int> dailyTemperatures(vector<int>& t) {
        stack<int> st;
        int n=t.size();
        vector<int> res(n);
        for(int i=n-1;i>=0;i--)
        {
            while(st.size()&&t[st.top()]<=t[i])  
                st.pop();
            if(st.empty())  res[i]=0;
            else res[i]=st.top()-i;
            st.push(i);
        }   
        return res;
    }
};