foo.cc: In function 'int main()':
foo.cc:36:21: error: too many arguments to function 'void dfs1(int, int)'
   36 |                 dfs1(1,i,i);
      |                 ~~~~^~~~~~~
foo.cc:10:6: note: declared here
   10 | void dfs1(int i,int j)
      |      ^~~~

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