View Compilation Error

0_0_18429539_12036.cpp: In function 'void topsort()':
0_0_18429539_12036.cpp:57:4: error: 'q' was not declared in this scope
    q[r]=i;
    ^
0_0_18429539_12036.cpp:69:7: error: 'q' was not declared in this scope
     u=q[l]; sum--; i=head[u];
       ^
0_0_18429539_12036.cpp:72:9: error: 'e' was not declared in this scope
       v=e[i].v; d[v]--;
         ^