300105: CF23D. Tetragon
Memory Limit:256 MB
Time Limit:3 S
Judge Style:Text Compare
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Description
Tetragon
题意翻译
给定 $3$ 个点,判定是否存在一个严格凸四边形,使得其中三条长度相等的边的中点恰好是这 $3$ 个点。不超过50000组数据。 坐标范围比较小。 输入格式: 第一行表示有几组数据 接下来是数据,每组数据分为3部分分别是第一个点,第二个点,第三个点的坐标。 输出格式 要是不存在,输出NO,否则第一行输出YES,第二行输出4对数字——以顺时针和逆时针的顺序对多边形顶点的坐标。 Translated by liyifeng题目描述
You're given the centers of three equal sides of a strictly convex tetragon. Your task is to restore the initial tetragon.输入输出格式
输入格式
The first input line contains one number $ T $ — amount of tests ( $ 1<=T<=5·10^{4} $ ). Each of the following $ T $ lines contains numbers $ x_{1} $ , $ y_{1} $ , $ x_{2} $ , $ y_{2} $ , $ x_{3} $ , $ y_{3} $ — coordinates of different points that are the centers of three equal sides (non-negative integer numbers, not exceeding 10).
输出格式
For each test output two lines. If the required tetragon exists, output in the first line YES, in the second line — four pairs of numbers — coordinates of the polygon's vertices in clockwise or counter-clockwise order. Don't forget, please, that the tetragon should be strictly convex, i.e. no 3 of its points lie on one line. Output numbers with 9 characters after a decimal point. If the required tetragon doen't exist, output NO in the first line, and leave the second line empty.
输入输出样例
输入样例 #1
3
1 1 2 2 3 3
0 1 1 0 2 2
9 3 7 9 9 8
输出样例 #1
NO
YES
3.5 1.5 0.5 2.5 -0.5 -0.5 2.5 0.5
NO