View Compilation Error

0_0_18120943_6484.cpp: In function 'int main()':
0_0_18120943_6484.cpp:128:39: error: 'ans' was not declared in this scope
         printf("Case #%d: %d\n",cas++,ans);
                                       ^
0_0_18120943_6484.cpp: At global scope:
0_0_18120943_6484.cpp:130:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_18120943_6484.cpp:131:1: error: expected declaration before '}' token
 }
 ^