标题:递增三元组
给定三个整数数组 A [A1, A2, … AN], B [B1, B2, … BN], C [C1, C2, … CN], 请你统计有多少个三元组(i, j, k) 满足:
1 < i, j, k < NAi < Bj < Ck
【输入格式】 第一行包含一个整数N。 第二行包含N个整…
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