本篇技术指南围绕 LeetCode 2215「找出两个数组的不同（Find the Difference of Two Arrays）」展开，完整讲解暴力枚举、排序 + 双指针、哈希集合、内建集合差运算四种解法的思路、算法步骤、多语言代码与复杂度分析，并对照本仓库 python、cpp、javascript、c等真实提交 ...

本文基于 leetcode 多语言解法库中的题解文档 divide-array-into-equal-pairs.md，系统讲解"将长度为 2n 的整数数组划分为 n 个相同元素对"这一经典判偶频率问题的三种算法：排序扫游程、哈希表计数与哈希集切换（toggle）。读完后，你将掌握三种方案的完整直觉、逐步 ...

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