View Compilation Error

0_0_17397460_25264.cpp: In function 'void topo()':
0_0_17397460_25264.cpp:12:30: error: 'push' was not declared in this scope
   if(!(r[i].rd[0])) push(r[i]);
                              ^
0_0_17397460_25264.cpp:20:46: error: 'push' was not declared in this scope
      if(r[tmp.cd[i]].lr==0) push(r[tmp.cd[i]]);
                                              ^
0_0_17397460_25264.cpp: In function 'int main()':
0_0_17397460_25264.cpp:32:13: error: 'cd' was not declared in this scope
   r[a].cd[++cd[0]]=a;
             ^
0_0_17397460_25264.cpp:33:13: error: 'rd' was not declared in this scope
   r[b].rd[++rd[0]]=b;
             ^