View Compilation Error

0_0_39484312_30106.cpp: In function 'int main()':
0_0_39484312_30106.cpp:56:27: error: 'y3' was not declared in this scope; did you mean 'y2'?
   56 |                 if(bfs(x1,y3)) cout<<sum<<endl;
      |                           ^~
      |                           y2