View Compilation Error

0_0_38226040_30488.cpp: In function 'int dfs(int, int)':
0_0_38226040_30488.cpp:50:37: error: too many arguments to function 'int dfs(int, int)'
   int ret = dfs(y, sum + w, o ^ 1, x);
                                     ^
0_0_38226040_30488.cpp:36:5: note: declared here
 int dfs(int x, int fa = -1)
     ^