View Compilation Error

0_0_34040958_19066.cpp: In function 'void dfs(int)':
0_0_34040958_19066.cpp:33:3: error: 'ans' was not declared in this scope
   ans++;
   ^
0_0_34040958_19066.cpp: In function 'int main()':
0_0_34040958_19066.cpp:54:3: error: 'ans' was not declared in this scope
   ans = 0;
   ^