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Introduction
Single Array 单数组
- 找特殊元素
  - 【Medium】633. Find the Duplicate Number
Sub Arrays 子数组
Two Arrays 双数组
- 交集
  - 【Easy】548. Intersection of Two Arrays II
Linked List 链表
Segment 线段
Interval 区间
Binary Search 二分法
- 值域二分
  - 【Medium】617. Maximum Average Subarray II
  - 【Easy】662. Guess Number Game
- 索引二分
  - 【Medium】460. Find K Closest Elements
  - 【Medium】824. Single Number IV
Sort 排序
- 【Medium】104. Merge K Sorted Lists
Top-K 查询
Palindrom 回文串
- 验证
- 求最长
  - 【Medium】200. Longest Palindromic Substring
  - 【Easy】627. Longest Palindrome
Mathmatic 数学运算
Data Structure 构造数据结构
- heap
  - 【Medium】 130. Heapify

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【Medium】104. Merge K Sorted Lists

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