0_0_30677119_10700.cpp: In function 'void dfs2(int, int, int)':
0_0_30677119_10700.cpp:50:23: error: too few arguments to function 'void dfs2(int, int, int)'
dfs2(to, u);
^
0_0_30677119_10700.cpp:41:6: note: declared here
void dfs2(int u, int fa, int num)
^
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