萌新不懂这个判断哪里错了QWQ

#include<iostream>
#include<cstring>
#include<cstdlib>
#include<cstdlib>
using namespace std;
int q[10];
int w[10];
int e[10];
bool check(int s,int d,int f)
     {int i=1;
      while(s!=0)
         {q[i]=s%10;
          s=s/10;
          w[i]=d%10;
          d=d/10;
          e[i]=f%10;
          f=f/10;
          i++;//取位数 
         }
    for(int i=1;i<=3;i++)
       for(int j=1;j<=3;j++)
          for(int k=1;k<=3;k++)
              {if(q[i]==w[j]||q[i]==e[k]||w[j]==e[k])
                 return 0;
              if(q[i]==0||w[j]==0||e[k]==0) 
                 return 0;
              //if(q[i]==q[i+1]||q[i]==q[i+2]||q[i+1]==q[i+2])
              }
    if(q[i]==q[i+1]||q[i]==q[i+2]||q[i+1]==q[i+2]) return 0;
    if(w[i]==w[i+1]||w[i]==w[i+2]||w[i+1]==w[i+2]) return 0;
    if(e[i]==e[i+1]||e[i]==e[i+2]||e[i+1]==e[i+2]) return 0;
    //判断每个位数有没有重 
     return 1;
     }

int main()
{int a,b,c;
bool flag=0;
cin>>a>>b>>c;
for(int i=123;i<=987;i++)
    {int x=a*i,y=b*i,z=c*i;
     if(x<=999&&y<=999&z<=999&&check(x,y,z)==1)
       {cout<<x<<" "<<y<<" "<<z<<endl;
        flag=1;
       }
    }
if(flag==0)
  cout<<"No!!!";
return 0;
}

if(q[i]==q[i+1]||q[i]==q[i+2]||q[i+1]==q[i+2]) return 0;
    if(w[i]==w[i+1]||w[i]==w[i+2]||w[i+1]==w[i+2]) return 0;
    if(e[i]==e[i+1]||e[i]==e[i+2]||e[i+1]==e[i+2]) return 0;
    //判断每个位数有没有重 
   就是这个地方，哪里错了，萌新不懂QWQ