View Compilation Error

0_0_37461520_14541.cpp: In function 'void dfs(int)':
0_0_37461520_14541.cpp:112:13: error: 'ans' was not declared in this scope
             ans--;
             ^
0_0_37461520_14541.cpp:119:9: error: 'ans' was not declared in this scope
         ans--;
         ^
0_0_37461520_14541.cpp: In function 'int main()':
0_0_37461520_14541.cpp:134:9: error: 'ans' was not declared in this scope
         ans = 0;
         ^