{"trustable":false,"sections":[{"title":"","value":{"format":"HTML","content":"\u003cpre class\u003d\"sio\"\u003e\n请认准俞大仙好翻译。\n树的最小点覆盖。"}},{"title":"Input","value":{"format":"HTML","content":"\u003cpre class\u003d\"sio\"\u003e多组数据,每组包含:\n结点数n。\nn行,每行有这个结点的编号,儿子数,以及各个儿子的编号。"}},{"title":"Output","value":{"format":"HTML","content":"每组数据一行,为树的最小点覆盖。"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre class\u003d\"sio\"\u003e4\n0:(1) 1\n1:(2) 2 3\n2:(0)\n3:(0)\n5\n3:(3) 1 4 2\n1:(1) 0\n2:(0)\n0:(0)\n4:(0)\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre class\u003d\"sio\"\u003e1\n2\u003c/pre\u003e"}}]}