View Compilation Error

0_0_36969924_20762.cpp: In function 'void add_edge(int, int, int, int)':
0_0_36969924_20762.cpp:34:67: error: 'cd' was not declared in this scope
     nxt[++etot]=head[u],head[u]=etot,to[etot]=v,A[etot]=a,C[etot]=cd;
                                                                   ^
0_0_36969924_20762.cpp: In function 'int main()':
0_0_36969924_20762.cpp:100:26: error: 'm' was not declared in this scope
         scanf("%d%d",&n,&m); tot=2*n+m;
                          ^