This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
int main(){
int n; cin >> n;
stack<int> st;
st.push(0);
for(int i = 0; i < n; i++){
int a; cin >> a;
if(a < 0) st.pop();
else st.push(a);
cout << st.top() << '\n';
}
}
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