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book-algorithms's Introduction

红黑树和哈希表比较

  • 红黑树是有序的，Hash是无序的，根据需求来选择。
  • 红黑树占用的内存更小（仅需要为其存在的节点分配内存），而Hash事先就应该分配足够的内存存储散列表（即使有些槽可能遭弃用）。
  • 红黑树查找和删除的时间复杂度都是O(logn)，Hash查找和删除的时间复杂度都是O(1)。

动态规划

核心：记住已经解决过的子问题的解

  • 53.Maximum Subarray

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