A7770. Letter A
编程题
普及/提高-
知识点
题目描述
Little Petya learns how to write. The teacher gave pupils the task to write the letter $A$ on the sheet of paper. It is required to check whether Petya really had written the letter $A$ .
You are given three segments on the plane. They form the letter $A$ if the following conditions hold:
- Two segments have common endpoint (lets call these segments first and second), while the third segment connects two points on the different segments.
- The angle between the first and the second segments is greater than $0$ and do not exceed $90$ degrees.
- The third segment divides each of the first two segments in proportion not less than $1/4$ (i.e. the ratio of the length of the shortest part to the length of the longest part is not less than $1/4$ ).
You are given three segments on the plane. They form the letter $A$ if the following conditions hold:
- Two segments have common endpoint (lets call these segments first and second), while the third segment connects two points on the different segments.
- The angle between the first and the second segments is greater than $0$ and do not exceed $90$ degrees.
- The third segment divides each of the first two segments in proportion not less than $1/4$ (i.e. the ratio of the length of the shortest part to the length of the longest part is not less than $1/4$ ).
输入格式
The first line contains one integer $t$ ( $1<=t<=10000$ ) — the number of test cases to solve. Each case consists of three lines. Each of these three lines contains four space-separated integers — coordinates of the endpoints of one of the segments. All coordinates do not exceed $10^{8}$ by absolute value. All segments have positive length.
输出格式
Output one line for each test case. Print «YES» (without quotes), if the segments form the letter $A$ and «NO» otherwise.
输入输出样例
输入 #1
3 4 4 6 0 4 1 5 2 4 0 4 4 0 0 0 6 0 6 2 -4 1 1 0 1 0 0 0 5 0 5 2 -1 1 2 0 1
输出 #1
YES NO YES