#include <iostream>
#include<math.h>
using namespace std;
int main() {
long int t;double n,m;int flag=0;int pos;int ctr=0,sum;
cin>>t;
for(int i=0;i<t;i++)
{cin>>n>>m;sum=0;flag=0;pos=0;
ctr=0;
for(int j=1;j<=n;j++)
{sum+=j;
if(sum>=m&&ctr==0)
{ctr++;flag=1;pos=j;}
}
if(flag==1)
{cout<<pos<<endl;}
else
{cout<<sum-m<<endl;}
}
return 0;
}
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