https://answer.freetools.me/tags/prefix-sum/ Recent content in Prefix Sum on Answer Hugo -- 0.152.2 zh-cn Sun, 08 Mar 2026 19:56:18 +0800 https://answer.freetools.me/%E5%89%8D%E7%BC%80%E5%92%8C%E7%AE%97%E6%B3%95%E5%A6%82%E4%BD%95%E7%94%A8%E4%B8%80%E6%AC%A1%E9%A2%84%E5%A4%84%E7%90%86%E6%8D%A2%E6%9D%A5o1%E5%8C%BA%E9%97%B4%E6%9F%A5%E8%AF%A2/ Sun, 08 Mar 2026 19:56:18 +0800 https://answer.freetools.me/%E5%89%8D%E7%BC%80%E5%92%8C%E7%AE%97%E6%B3%95%E5%A6%82%E4%BD%95%E7%94%A8%E4%B8%80%E6%AC%A1%E9%A2%84%E5%A4%84%E7%90%86%E6%8D%A2%E6%9D%A5o1%E5%8C%BA%E9%97%B4%E6%9F%A5%E8%AF%A2/ 一篇系统讲解前缀和算法的深度教程，从一维前缀和到二维矩阵前缀和，再到前缀和与哈希表的经典结合模式。结合LeetCode经典题目（303/304/560/974/523/437/1248等）的完整Java实现与复杂度分析，帮助你彻底掌握这一面试高频算法模式。