View Compilation Error

0_0_31802853_1123.cpp: In function 'int main(int, const char**)':
0_0_31802853_1123.cpp:93:17: error: 'flag' was not declared in this scope
             if (flag) ans = mid,r = mid-1;
                 ^
0_0_31802853_1123.cpp:97:17: error: 'ans' was not declared in this scope
         cout << ans << endl;
                 ^
0_0_31802853_1123.cpp: At global scope:
0_0_31802853_1123.cpp:99:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_31802853_1123.cpp:100:1: error: expected declaration before '}' token
 }
 ^