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48570 【LGR-089】洛谷 8 月月赛 II

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T166874: R55803919
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Baoshuo Ren 2021-08-13 18:38:30 +08:00 committed by Baoshuo Ren
parent 2fa8305968
commit ffffd5fcd1
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 17 additions and 0 deletions
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Luogu/contest/48570/T166874/T166874.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
const long long mod = 1e9 + 7;
long long t, n, k, k1, k2;
int main() {
cin >> t;
while (t--) {
cin >> n >> k;
k1 = k + 1 >> 1;
k2 = k >> 1;
cout << 1ll * (((((n * (n + 1)) / 2 % mod * k1 % mod) - (((k1 - 1) * k1) / 2 % mod) % mod) + ((((n - 1) * n) / 2 % mod * k2 % mod) - ((k2 - 1) * k2) / 2) % mod) % mod + mod) % mod << endl;
}
return 0;
}