1371B - Magical Calendar - CodeForces Solution

#include<bits/stdc++.h>
#define ll long long
const ll N = 2e5+5;
using namespace std;
int main(){
    int t;
    cin>>t;
    while(t--){
        ll n, r;
        cin>>n>>r;
        cout<<1ll*min(n*(n-1)/2+1, r*(r+1)/2)<<endl;
    }
}