View Compilation Error

0_0_17940851_23461.cpp: In function 'void dfs(int, int, int)':
0_0_17940851_23461.cpp:31:18: error: too few arguments to function 'void dfs(int, int, int)'
             dfs(v);
                  ^
0_0_17940851_23461.cpp:24:6: note: declared here
 void dfs(int u,int fa,int K){
      ^