求助为什么程序一开始就运行不下去

#include<cstdio>
#include<iostream>
#include<cmath>
#include<algorithm>
//#include<bitset>
int gcd(int i,int j)
{int r=0;    
while(j!=0)
{
        r=i%j;//余数//r=j
//除数除余数 
    i=j;
    j=r;
} return i;
}
int lcm(int a, int b)
{
    return a*b/gcd(a,b);
}
using namespace std;
int main(){
    int i,j;int ans;
    //i=j=0;
    ans=0;
    int maxn,minn;
    cin>>maxn>>minn;
    for(i=0;i<=minn;i+=maxn)
        for(j=0;j<=minn;j+=maxn){
            if(gcd(i,j)==maxn&&lcm(i,j)==minn)ans++;
        }
    cout<<ans;
}