题解

#include<bits/stdc++.h>
using namespace std;
int n,s,ans;
int main(){
cin>>n>>s;
int t=n2;
if(n2*(n+1)<s) s=n2(n+1);
for(int i=n+1;i>=0;i--){
if(it<=s&&s-it>=n+1-i){
ans=i;
break;
}
}
cout<<ans;
return 0;
}