sunp823

摘要： java集合类主要由两个接口派生而出:Collection和Map,请注意，Map没有继承Collection接口. Set集合。 Set集合里面的多个对象没有明显顺序。Set不允许有重复元素。当试图把两个相同的对象（）加入一个Set中时,对象会调用equals方法比较两个对象元素是否相同，... 阅读全文

摘要： Isomorphic Strings Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be replaced ... 阅读全文

摘要： JDK1.2之前，Java中引用（reference）的定义：如果reference类型的数据中存储的数值代表的是另外一块内存的起始地址，那么这块内存就是一个引用。这样的概念不足以应对这样的情况：对于一些可有可无的对象，当内存空间足够时，则将对象保存在内存中，不回收；如果内存在垃圾回收后还是不足... 阅读全文

摘要： Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your ma... 阅读全文

摘要： 最近在看《深入理解Java虚拟机》，看了没几页，看到了一个以前不了解的概念：native方法。学习如下： "A native method is a Java method whose implementation is provided by non-java code." native方法即... 阅读全文

摘要： 题目： Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). You are given a tar... 阅读全文

摘要： Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in ... 阅读全文

摘要： Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two... 阅读全文

摘要： 问题：Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. 将两个... 阅读全文

摘要： https://leetcode.com/problems/pascals-triangle/ Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5, ... 阅读全文