View Compilation Error

0_0_36343674_15017.cpp: In function 'int main()':
0_0_36343674_15017.cpp:57:6: error: 'flag' was not declared in this scope
   if(flag)cout<<"YES"<<endl;
      ^
0_0_36343674_15017.cpp: At global scope:
0_0_36343674_15017.cpp:60:1: error: expected declaration before '}' token
 }
 ^