/in/foo.cc: In function 'void dfs(int*, int, int, int)':
/in/foo.cc:23:17: error: expected ';' before 'son'
                 son[k]=i;
                 ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:48:4: error: 'cur' was not declared in this scope
    cur++;
    ^~~