View Compilation Error

0_0_21650286_21880.cpp: In function 'int dfs(int)':
0_0_21650286_21880.cpp:10:11: error: 'ans' was not declared in this scope
  if(res>2)ans=0;
           ^
0_0_21650286_21880.cpp: In function 'int main()':
0_0_21650286_21880.cpp:29:4: error: 'ans' was not declared in this scope
    ans=1;
    ^