/in/foo.cc: In function 'void dfs()':
/in/foo.cc:9:8: error: too many arguments to function 'void dfs()'
    9 |     dfs(a[x][1]);
      |     ~~~^~~~~~~~~
/in/foo.cc:5:6: note: declared here
    5 | void dfs(){
      |      ^~~
/in/foo.cc:10:8: error: too many arguments to function 'void dfs()'
   10 |     dfs(a[x][2]);
      |     ~~~^~~~~~~~~
/in/foo.cc:5:6: note: declared here
    5 | void dfs(){
      |      ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:18:8: error: too many arguments to function 'void dfs()'
   18 |     dfs(1);
      |     ~~~^~~
/in/foo.cc:5:6: note: declared here
    5 | void dfs(){
      |      ^~~