灵异事件？

#include<bits/stdc++.h>
using namespace std;
int main(){
    for(int i=1;i<=9;i++){
        for(int j=1;j<=9;j++){
            for(int k=1;k<=9;k++){
                for(int a=1;a<=9;a++){
                    for(int b=1;b<=9;b++){
                        for(int c=1;c<=9;c++){
                            for(int x=1;x<=9;x++){
                                for(int y=1;y<=9;y++){
                                    for(int z=1;z<=9;z++){
                                        if((a==b)||(a==c)||(a==i)||(a==j)||(a==k)||(a==x)||(a==y)||(a==z)||(b==c)||(b==i)||(b==j)||(b==k)||(b==x)||(b==y)||(b==z)||(c==i)||(c==j)||(c==k)||(i==j)||(i==k)||(i==x)||(i==y)||(i==z)||(j==k)||(j==x)||(j==y)||(j==z)||(k==x)||(k==y)||(k==z)||(x==y)||(x==z)||(y==z))
                                        int ans =100*i+10*j+k;
                                        int ans2=100*a+10*b+c;
                                        int ans3=100*x+10*y+z;
                                        if((ans *2==ans2) && (ans *3==ans3)){
                                            cout<<ans<<" "<<ans2<<" "<<ans3<<"\n";
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    return 0;
}

编译情况

/tmp/compiler_s1xma61k/src: In function ‘int main()’:
/tmp/compiler_s1xma61k/src:14:45: 警告：unused variable ‘ans’ [-Wunused-variable]
   14 |                                         int ans =100*i+10*j+k;
      |                                             ^~~
/tmp/compiler_s1xma61k/src:17:45: 错误：‘ans’ was not declared in this scope; did you mean ‘ans3’?
   17 |                                         if((ans *2==ans2) && (ans *3==ans3)){
      |                                             ^~~
      |                                             ans3

为什么编译错误？