I have a problem with an algorithmic task. There is content of it: "You have ten points on a plane and none three of them are collinear, each pair of different points is connected by line segment, which is green or blue. Calculate how many triangles have sides only in one colour." I tried a solution with n-ary trees but I get repeated triangles with cyclic permutations of integers on the result list.
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Patryk, the problem is solvable with n-trees. However, to avoid cyclic permutations you need to skip symmetric line segments. If you create a line segment from 0 -> 1 you do not need to create a segment from 1 -> 0. Below is a complete code which solves the problem with n-trees with the recursive depth-first search. Excuse for Polish names of classes and methods. The interface is in English however. If you analyze the code you will get the point surely.