View Compilation Error

0_0_29911136_25436.cpp: In function 'void bfs(int, int, int, int)':
0_0_29911136_25436.cpp:33:4: error: 'ans' was not declared in this scope
    ans=1;
    ^
0_0_29911136_25436.cpp: In function 'int main()':
0_0_29911136_25436.cpp:76:6: error: 'ans' was not declared in this scope
   if(ans) printf("yes\n");
      ^