View Compilation Error

0_0_37530786_18997.cpp: In function 'int main()':
0_0_37530786_18997.cpp:28:5: error: 'ans' was not declared in this scope
     ans = 0;
     ^
0_0_37530786_18997.cpp: At global scope:
0_0_37530786_18997.cpp:38:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_37530786_18997.cpp:39:1: error: expected declaration before '}' token
 }
 ^