Given an array A of integers , I am trying to find out at a given position j , how many times A[j] occurs from every i=0 to i=j in A. I have devised a solution like belowGiven an array A of integers , I am trying to f
阅读背景：
给定索引i，j（j> = i）如何在子阵列（i，j）处找到A [j]的频率？
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