gyro永不抽风！ - Archived | 306-14-CDQ分治-陌上花开 的评论
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link: https://gallery.gyrojeff.top/index.php/archives/126/
description: 题目大意对于给遗传给定的序列：$$(x,y,z)_1, (x,y,z)_2, (x,y,z)_3, \cdots, (x,y,z)_n$$求：$$\sum_{x_i < x_j,~y_i ...