View Compilation Error

0_0_25415290_11808.cpp: In function 'int main()':
0_0_25415290_11808.cpp:20:14: error: 'flag' was not declared in this scope
              flag=0;
              ^
0_0_25415290_11808.cpp:36:13: error: expected ';' before '}' token
             }
             ^