#5为什么错

#include<iostream>
using namespace std;
int main()
{
    int x,y,z,flag=1,i,j,num[4],a[10],book[100],k,u;
    cin>>x>>y>>z;
    for  (i=100;i<=999;i++)
    {
        num[1]=i*x;
        num[2]=i*y;
        num[3]=i*z;
        a[1]=num[1]/100;
        a[2]=num[1]/10%10;
        a[3]=num[1]%10;
        a[4]=num[2]/100;
        a[5]=num[2]/10%10;
        a[6]=num[2]%10;
        a[7]=num[3]/100;
        a[8]=num[3]/10%10;
        a[9]=num[3]%10;
        for (j=1;j<=9;j++)
        {
            book[j]=0;
        }
        for (k=1;k<=9;k++)
        {
            book[a[k]]=1;
        }
        int sum=0;
        for (u=1;u<=9;u++)
        {
            sum=sum+book[u];
        }
        if (sum==9) 
        {
        cout<<num[1]<<" "<<num[2]<<" "<<num[3]<<endl;
        flag=0;
        }
    }
    if (flag==1) cout<<"No!!!";
     return 0;
}