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 Equilateral triangle Time Limit: 1000ms, Special Time Limit:2500ms, Memory Limit:32768KB Total submit users: 70, Accepted users: 32 Problem 10008 : No special judgement Problem description There is an infinite equilateral triangle gridding ， numbering vertices(crossing points) as shown in figure below.Some three vertices of them form an equilateral triangle,for example,{1,2,3},{7,9,18},etc.These equilateral triangles must satisfy that each edge of the equilateral triangle is a part of a line of the equilateral triangle gridding.Thus vertices{5 10 13} are not vertices of an equilateral triangle. Your task is to point out whether three given vertices form an equilateral triangle. Input Input is a sequence of lines, each line containing three integers:i,j,k , indicating numbers of 3 vertices. You may assume that 1>i,j,k<231 . Output For each line of input, output one line “i j k are vertices of an equilateral triangle.” if vertices {i,j,k} form an equilateral triangle,otherwise, output one line “i j k are not vertices of an equilateral triangle.” Sample Input 1 2 3 6 7 8 7 9 18 5 10 13 Sample Output 1 2 3 are vertices of an equilateral triangle. 6 7 8 are not vertices of an equilateral triangle. 7 9 18 are vertices of an equilateral triangle. 5 10 13 are not vertices of an equilateral triangle. Problem Source HNU Contest Submit   Discuss   Judge Status  Problems  Ranklist

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