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https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=1872
#include<iostream>
#include<stack>
using namespace std;
int main() {
stack<int> st;
int n;
while(cin >> n && n){
int parity = 0;
while(n) {
parity += n % 2;
st.push(n % 2);
n /= 2;
}
cout << "The parity of ";
while(st.size()) {
cout << st.top();
st.pop();
}
cout << " is " << parity << " (mod 2).\n";
}
return 0;
}
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