1090. Three Sides Make a Triangle

单点时限: 2.0 sec

内存限制: 256 MB

You work for an art store that has decided to carry every style and size of drafting triangle in existence. Unfortunately, sorting these has become a problem. The manager has given you the task of organizing them. You have decided to classify them by edge length and angles. To measure each triangle, you set it on a large sheet of very accurate graph paper and record the coordinate of each point. You then run these three points through a computer program to classify the triangles according to:

Scalene: no equal sides

Isosceles: two equal sides

Equilateral: three equal sides


Acute: all angles under 90

Right: one angle equal 90

Obtuse: one angle over 90

Of course, sometimes you make mistakes entering the data, so if you input points that do notform a valid triangle, your program should tell you.


One triangle is described per line. Each line has six measurements taken to the nearest 0.001 in the order:

x1 y1 x2 y2 x3 y3

The final line of input will contain only a -1.

None of the test sets contain non-right angles in the range 88-92 degrees, nor do any of the test sets include any non-equal side lengths for one triangle within 0.01 of one another.


You will output one line for each triangle, which will contain two words:


Not a Triangle

The final line of your output file will be:

End of Output


10.000 10.000 10.000 20.000 20.000 10.000
0.000 0.000 4.000 0.000 2.000 3.464
Isosceles Right
Equilateral Acute
End of Output

18 人解决,28 人已尝试。

24 份提交通过,共有 142 份提交。

5.7 EMB 奖励。

创建: 16 年,9 月前.

修改: 6 年,3 月前.

最后提交: 3 年前.

来源: partychen