We Are Friends 2

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Teacher of Pizza school of Margarita District is in serious problem, that his class students have developed groupism such that there are $N$ groups and every $i-th$ group contains $A[i]$ students. Teacher found that in the group there is a strong friendship but among the groups it's enmity. Now teacher decided to unite the whole class in the friendship. So he decided to select triplet of students

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solution.cppC++17

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