View Compilation Error

0_0_38311687_9646.cpp: In function 'void dfs(int, int)':
0_0_38311687_9646.cpp:19:9: error: too few arguments to function 'void dfs(int, int)'
    dfs(i);
         ^
0_0_38311687_9646.cpp:15:6: note: declared here
 void dfs(int u, int now) {
      ^
0_0_38311687_9646.cpp: In function 'int main()':
0_0_38311687_9646.cpp:32:8: error: too few arguments to function 'void dfs(int, int)'
   dfs(2);
        ^
0_0_38311687_9646.cpp:15:6: note: declared here
 void dfs(int u, int now) {
      ^