HDU 5158Have meal

本题为简单的数学题目，没别的好说的，下面附上AC代码

这里写代码片#include<cstdio>#include<cstring>#include<algorithm>#include <iostream>using namespace std;int main()  {      int n, m;      while (cin>>n>>m)      {          int x;          x=m%n;          if (x==0)cout<<n-1<<endl;          else cout<<x-1<<endl;      }    return 0;  }