{"trustable":false,"sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003e给你一个有n个顶点的图,求顶点无标号的有根树的数目\u003c/p\u003e\n "}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003e输入一个整数\u003ci\u003eN\u003c/i\u003e (1 ≤ \u003ci\u003eN\u003c/i\u003e ≤ 50)\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003e输出结果!\u003c/p\u003e"}},{"title":"Example","value":{"format":"HTML","content":"\u003cstyle type\u003d\"text/css\"\u003e TABLE.sample { border-collapse:collapse; border: solid 1px #1A5CC8; } TABLE.sample TR TD, TABLE.sample TR TH { border: solid 1px #1A5CC8; vertical-align: top; padding: 3px; } TABLE.sample TR TH { color: #1A5CC8; }\u003c/style\u003e\n \u003ctable class\u003d\"sample\"\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003cth width\u003d\"350\"\u003einput\u003c/th\u003e\n \u003cth width\u003d\"350\"\u003eoutput\u003c/th\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e3\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e2\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e5\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e9\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n \u003c/tbody\u003e\n \u003c/table\u003e\n "}}]}