View Compilation Error

0_0_37848882_13407.cpp: In function 'int main()':
0_0_37848882_13407.cpp:71:17: error: 'ans' was not declared in this scope
   printf("%d\n",ans);
                 ^
0_0_37848882_13407.cpp: At global scope:
0_0_37848882_13407.cpp:73:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_37848882_13407.cpp:74:1: error: expected declaration before '}' token
 }
 ^