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原创关于Arrays.copyOfRange一个易错点

Arrays.copyOfRange方法可以实现对一个数组一定范围内元素的拷贝。其函数原型为：static type copyOfRange(type[] a, int start, int end)参数：a 类型为8大基本类型的数组。start 起始下标（包含这个值）。end 终止下标（不包含这个值）。使用方法如：int [] s1 = {1,2,3,4,5}; int [] ...

2018-03-15 23:29:52 2832 6

原创算法习题8.22 题解

Problem In task scheduling, it is common to use a graphrepresentation with a node for each task and a directed edge from task ito task j if i is a precondition for j. This directedgraph depicts the

2018-01-20 19:40:55 467

原创 Leetcode代码学习周记——Number Complement

题目链接： https://leetcode.com/problems/number-complement/description/ 题目描述： Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary repres

2018-01-20 19:30:02 298

原创 Leetcode代码学习周记——Merge Two Binary Trees

题目链接： https://leetcode.com/problems/merge-two-binary-trees/description/ 题目描述： Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees

2018-01-20 19:18:40 269

原创 Leetcode代码学习周记——Find Anagram Mappings

题目链接： https://leetcode.com/problems/find-anagram-mappings/description/ 题目描述： Given two lists Aand B, and B is an anagram of A. B is an anagram of A means B is made by randomizing the or

2018-01-20 19:07:48 312

原创 Leetcode代码学习周记——3Sum

题目链接： https://leetcode.com/problems/3sum/description/ 题目描述： Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array wh

2018-01-20 18:16:36 263

原创 Leetcode代码学习周记——Longest Common Prefix

题目链接： https://leetcode.com/problems/longest-common-prefix/description/ 题目描述： Write a function to find the longest common prefix string amongst an array of strings. 编写一个函数以查找一个字符串数组中所有字符串的最长公共前

2018-01-20 17:14:28 298

原创 Leetcode代码学习周记——Palindrome Number

题目链接： https://leetcode.com/problems/palindrome-number/description/ 题目描述： Determine whether an integer is a palindrome. Do this without extra space. 判断一个整数是否为回文整数。题解：先排除复数和非0的10的倍数。随后从该整数

2018-01-20 16:20:48 236

原创 Leetcode代码学习周记——Longest Palindromic Substring

题目链接：https://leetcode.com/problems/longest-palindromic-substring/ 题目描述：Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. 给定一个字

2018-01-13 21:48:52 230

原创算法练习——前K小数

题目描述：给定一个数组，输出该数组前K小数（无需排序）示例： Input: nums = {38, 61, 7, 87, 81, 18, 50, 55, 90, 26} K = 7 Output: result = {7, 18, 26, 38, 50, 55, 61} 题解：这道题目有两种解题方法，一是使用排序的算法让数组从小到大排好序，然后依次输出数组的前K个整数。这

2017-12-16 17:31:13 838

原创 Leetcode代码学习周记——Self Dividing Numbers

题目链接： https://leetcode.com/problems/self-dividing-numbers/description/ 题目描述： A self-dividing number is a number that is divisible by every digit it contains. For example, 128 is a self-div

2017-12-16 15:35:48 302

原创 Leetcode代码学习周记——Sqrt(x)

题目链接： https://leetcode.com/problems/sqrtx/description/ 题目描述： Implement int sqrt(int x). Compute and return the square root of x. x is guaranteed to be a non-negative integer. 实现函数

2017-12-11 20:35:18 332

原创 Leetcode代码学习周记——Judge Route Circle

题目链接： https://leetcode.com/problems/judge-route-circle/description/ 题目描述： Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, wh

2017-12-10 22:11:10 237

原创 Leetcode代码学习周记——Hamming Distance

题目链接： https://leetcode.com/problems/hamming-distance/description/ 题目描述： The Hamming distance between two integers is the number of positions at which the corresponding bits are different.

2017-12-10 21:49:41 279

原创 Leetcode代码学习周记——Container With Most Water

题目链接： https://leetcode.com/problems/container-with-most-water/description/ 题目描述： Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical

2017-10-15 14:32:45 251

原创 Leetcode代码学习周记——Reverse Integer

原题目链接： https://leetcode.com/problems/reverse-integer/description/ 题目描述：反转一个整数的数位。实例： x = 123，return 321 x = -123，return -321 注意：输入假定为32位有符号整数。当反转的整数溢出时，您的函数应返回0。除了题目给出的限制，还应该

2017-10-03 21:42:19 300

原创 Leetcode代码学习周记——Longest Substring Without Repeating Characters

原题目链接： https://leetcode.com/problems/longest-substring-without-repeating-characters/description/ 题目描述：给定一个字符串，求其最长的没有重复字符的子字符串长度。实例：给定 "abcabcbb"，答案为 "abc", 长度为3。给定 "bbbbb"，答案为 "b

2017-09-21 10:36:18 294

原创 Leetcode代码学习周记——Add Two Nmubers

原题目链接： https://leetcode.com/problems/add-two-numbers/description/ 题目描述：给定两个表示了非负整数的链表。数字以相反的顺序存储，每个节点包含一个数字。把两个数相加并将其以链表的形式返回。给定的两个数除了0自身不含首位为0的。实例：输入: (2 -> 4 -> 3) + (5 -> 6 -> 4) 输出: 7

2017-09-16 16:08:13 397

原创 Leetcode代码学习周记——Two Sum

原题目链接： https://leetcode.com/problems/two-sum/description/ 题目描述：给定一个整数数组，返回两个数字的索引，使它们相加得到一个特定的目标值。你可以假设每个输入都只有一个解决方案，而您可能不会使用相同的元素两次。实例： Given nums = [2, 7, 11, 15], target = 9, Because nu

2017-09-10 21:17:46 361

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