View Compilation Error

0_0_18277505_26222.cpp: In function 'void mkfail()':
0_0_18277505_26222.cpp:35:95: error: 'flag' was not declared in this scope
                     for(int T2 = Head[i]; ; T2 = Next[T2]) if(Go[T2] == Go[T]) {Fail[T] = T2; flag = 1; break;}
                                                                                               ^