c_cpp http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=0013&lang=jp

Posted 2021-05-14

#include <iostream>
#include <stack>

int main(){
    int in;
    std::stack<int> st;

    while(std::cin >> in){
        if(in == 0){
            std::cout << st.top() << std::endl;
            st.pop();
        }else{
            st.push(in);
        }
    }

    return 0;
}