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P7157 「dWoi R1」Physics Problem

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Baoshuo Ren 2020-12-27 20:34:21 +08:00 committed by Baoshuo Ren
parent 101fc7e5db
commit 7e6f998ec6
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 10 additions and 0 deletions
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problem/P7157/P7157.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
int main() {
long long n, k;
cin >> n >> k;
cout << n * (n - 1) / 2 - k << endl;
return 0;
}