View Compilation Error

0_0_13920893_31102.cpp: In function 'void Solve()':
0_0_13920893_31102.cpp:176:25: error: 'flag' was not declared in this scope
     for(int i=2; i<=n&&!flag; i++)
                         ^
0_0_13920893_31102.cpp:182:22: error: 'flag' was not declared in this scope
     printf("%I64d\n",flag?0:ans%mod);
                      ^