View Compilation Error

0_0_17110949_18990.cpp: In function 'void addedge(int, int)':
0_0_17110949_18990.cpp:19:5: error: 'q' was not declared in this scope
     q[cnt].to=cv;
     ^
0_0_17110949_18990.cpp: In function 'void Tarjan(int)':
0_0_17110949_18990.cpp:28:31: error: 'edge' was not declared in this scope
     for(int i=head[u];i!=-1;i=edge[i].nxt){
                               ^
0_0_17110949_18990.cpp: In function 'int main()':
0_0_17110949_18990.cpp:86:39: error: 'edge' was not declared in this scope
             for(int i=head[u];i!=-1;i=edge[i].nxt){
                                       ^