You are given a 2D integer array points where points[i] = [xi, yi] represents the coordinates of the ith point on the Cartesian plane. Return the number of unique trapezoids that can be formed by choosing any four distinct points from points. A trapezoid…

给你一个长度为 n 的整数数组 nums 。 分区 是指将数组按照下标 i （0 <= i < n - 1）划分成两个 非空 子数组，其中：

You are given an integer array nums of length n. A partition is defined as an index i where 0 <= i < n - 1, splitting the array into two non-empty subarrays such that: