[HackerEarth] Given an array A of N numbers, find the number of distinct pairs (i, j) such that j ≥i and A[i] = A[j]. - 题解

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题目信息
题号 P14985
标题 [HackerEarth] Given an array A of N numbers, find the number of distinct pairs (i, j) such that j ≥i and A[i] = A[j].
难度 普及
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