View Compilation Error

0_0_22120337_13829.cpp: In function 'int main()':
0_0_22120337_13829.cpp:43:12: error: 'struct node' has no member named 'flag'
     if(it->flag)  continue;
            ^
0_0_22120337_13829.cpp:58:11: error: 'struct node' has no member named 'flag'
       it->flag=1;
           ^