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题目描述： Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use t...

题目描述： You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and ...

数组Array： 集合Set: 集合是承载元素的容器； 特点：每个元素只能存在一次 优点：去重 二分搜索树的添加操作add：不能盛放重复元素 是非常好的实现“集合”的底层数据结构 /** * 集合的接口 */ public interface Set<E> { void add(E e);//添加 <——<不能添加重复元素 ...