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OI-codes/Luogu/P1161/P1161.cpp

21 lines
348 B
C++

// R36448353
#include <bits/stdc++.h>
using namespace std;
int main() {
int n, t, ans;
n = t = ans = 0;
double a;
n = t = ans = 0;
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a >> t;
for (int j = 1; j <= t; j++) {
ans ^= int(j * a);
}
}
cout << ans << endl;
return 0;
}