[HackerEarth] Given an array a of N numbers , you have to find the number of pair of indices i and j that satisfy the following relation: - 题解

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题目信息
题号 P13973
标题 [HackerEarth] Given an array a of N numbers , you have to find the number of pair of indices i and j that satisfy the following relation:
难度 提高-
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