View Compilation Error

0_0_38017349_23438.cpp: In function 'void dfs(int, int)':
0_0_38017349_23438.cpp:10:11: error: 'vis' was not declared in this scope
  siz[u]=1,vis[u]=1;
           ^
0_0_38017349_23438.cpp:13:19: error: too few arguments to function 'void dfs(int, int)'
   if (v!=fa) dfs(v),siz[u]+=siz[v],f[u]=max(f[u],f[v]);
                   ^
0_0_38017349_23438.cpp:9:6: note: declared here
 void dfs(int u,int fa){
      ^