{"trustable":false,"sections":[{"title":"","value":{"format":"HTML","content":"\u003cstyle type\u003d\"text/css\"\u003e .sampledata { font-family: \"Courier New\", Courier, monospace; white-space: pre; }\u003c/style\u003e\u003cp\u003e求一棵树上三点距离两两相等的三元组对数\n 树的边权均为1\u003cbr\u003e 数据范围:n\u0026lt;\u003d100000\u003c/p\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cspan class\u003dsampledata\u003e\n7\n1 2\n5 7\n2 5\n2 3\n5 6\n4 5\u003c/span\u003e\u003c/div\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cspan class\u003dsampledata\u003e5\u003c/span\u003e\u003c/div\u003e"}},{"title":"Hint","value":{"format":"HTML","content":"\u003cp\u003e\u003c/p\u003e"}}]}