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P3166 [CQOI2014]数三角形

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R52807909
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Baoshuo Ren 2021-07-10 22:05:19 +08:00 committed by Baoshuo Ren
parent 08a11da9c6
commit 79558550a7
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 17 additions and 0 deletions
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Luogu/problem/P3166/P3166.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
int main() {
long long n, m, ans;
cin >> n >> m;
n++, m++;
ans = n * m * (n * m - 1) * (n * m - 2) / 6 - n * m * (m - 1) * (m - 2) / 6 - m * n * (n - 1) * (n - 2) / 6;
for (long long i = 1; i <= n; i++) {
for (long long j = 1; j <= m; j++) {
ans -= 2ll * (__gcd(i, j) - 1) * (n - i) * (m - j);
}
}
cout << ans << endl;
return 0;
}