View Compilation Error

0_0_27366063_14360.cpp: In function 'int main()':
0_0_27366063_14360.cpp:51:14: error: 'flag' was not declared in this scope
              flag=1;
              ^
0_0_27366063_14360.cpp:54:8: error: 'flag' was not declared in this scope
     if(flag)
        ^