View Compilation Error

0_0_30781756_22406.cpp:15:1: error: expected initializer before 'int'
 int n,m;
 ^
0_0_30781756_22406.cpp: In function 'void add(int, int)':
0_0_30781756_22406.cpp:18:6: error: 'k' was not declared in this scope
  e[++k].next=head[u];
      ^
0_0_30781756_22406.cpp: In function 'int main()':
0_0_30781756_22406.cpp:29:3: error: 'k' was not declared in this scope
   k=0;
   ^
0_0_30781756_22406.cpp:34:17: error: 'n' was not declared in this scope
   scanf("%d%d",&n,&m);
                 ^
0_0_30781756_22406.cpp:34:20: error: 'm' was not declared in this scope
   scanf("%d%d",&n,&m);
                    ^