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P1161 开灯
R36448353
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problem/P1161/P1161.cpp
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21
problem/P1161/P1161.cpp
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// R36448353
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#include<bits/stdc++.h>
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using namespace std;
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int main() {
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int n, t, ans;
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n = t = ans = 0;
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double a;
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n = t = ans = 0;
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cin >> n;
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for(int i = 1 ; i <= n ; i++) {
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cin >> a >> t;
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for(int j = 1 ; j <= t ; j++) {
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ans ^= int(j*a);
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}
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}
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cout << ans << endl;
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return 0;
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}
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