03 2019 档案
摘要：最坏情况的时间复杂度：O(N log N) 归并排序是稳定排序，它也是一种十分高效的排序，能利用完全二叉树特性的排序一般性能都不会太差 。java中Arrays.sort()采用了一种名为TimSort的排序算法，就是归并排序的优化版本。从上文的图中可看出，每次合并操作的平均时间复杂度为O(n)，而
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摘要：三、堆排序(Heapsort) 优先队列可以用于O(N log N) 存储空间增加一倍 排序类别 排序方法 时间复杂度 时间复 杂度 空间复杂度 稳定性 复杂性 平均情况 最坏情况 最好情况 选择排序 堆排序 O(nlog2n) O(nlog2n) O(nlog2n) O(1) 不稳定 较复杂 堆排
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摘要：• 最坏情况下运行时间为 Θ(N2),此时为Hibbard增量 ( 希尔排序是把记录按下标的一定增量分组，对每组使用直接插入排序算法排序；随着增量逐渐减少，每组包含的关键词越来越多，当增量减至1时，整个文件恰被分成一组，算法便终止。 简单插入排序很循规蹈矩，不管数组分布是怎么样的，依然一步一步的对元
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摘要：Public class InsertionSort{ Public static> AnyType[] insertionSort(AnyType[]a){ intj; for(intp=0;p 0 && tmp.compareTo(a[j-1]) < 0;j--){ a[j]=a[j-...
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摘要：在Java编程语言中，最基本的结构就是两种，一种是数组，一种是模拟指针(引用),所有的数据结构都可以用这两个基本结构构造，HashMap也一样。当程序试图将多个 key-value 放入 HashMap 中时，以如下代码片段为例： HashMap<String,Object> m=new HashM
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摘要：import java.util.Collections;import java.util.Comparator;import java.util.LinkedHashMap;import java.util.LinkedList;import java.util.List;import java.
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摘要：转载：http://www.cnblogs.com/kristain/articles/2033566.html public static void main(String[] args) { Map<String, String> map = new HashMap<String, String
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摘要：附有连接（https://www.cnblogs.com/jingmoxukong/p/4302891.html），其中很多是引用其他作者，主要是自己学习随笔，如果有问题，请与我联系，万分感谢！
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摘要：The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descendants. A binary search tree (BST) i
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摘要：Werewolf（狼人杀） is a game in which the players are partitioned into two parties: the werewolves and the human beings. Suppose that in a game, player #1
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摘要：Among all the factors of a positive integer N, there may exist several consecutive numbers. For example, 630 can be factored as 3×\times×5×\times×6×\t
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摘要：Eva would like to make a string of beads with her favorite colors so she went to a small shop to buy some beads. There were many colorful strings of b
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摘要：For two rational numbers, your task is to implement the basic arithmetics, that is, to calculate their sum, difference, product and quotient. Input Sp
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摘要：On a broken keyboard, some of the keys are worn out. So when you type some sentences, the characters corresponding to those keys will not appear on sc
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摘要：Given N rational numbers in the form numerator/denominator, you are supposed to calculate their sum. Input Specification: Each input file contains one
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摘要：The Japanese language is notorious for its sentence ending particles. Personal preference of such particles can be considered as a reflection of the s
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摘要：Scientific notation is the way that scientists easily handle very large numbers or very small numbers. The notation matches the regular expression [+-
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摘要：For any 4-digit integer except the ones with all the digits being the same, if we sort the digits in non-increasing order first, and then in non-decre
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摘要：Given three integers A, B and C in [−263,263], you are supposed to tell whether A+B>C. Input Specification: The first line of the input gives th
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摘要：Sherlock Holmes received a note with some strange strings: Let's date! 3485djDkxh4hhGE 2984akDfkkkkggEdsb s&hgsfdk d&Hyscvnm. It took him only a minut
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摘要：If you are a fan of Harry Potter, you would know the world of magic has its own currency system -- as Hagrid explained it to Harry, "Seventeen silver
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摘要：Behind the scenes in the computer's memory, color is always talked about as a series of 24 bits of information for each pixel. In an image, the color
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摘要：Given two strings S1 and S2, S=S1−S2 is defined to be the remaining string after taking all the characters in S2 from S1. Your task
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摘要：The task is really simple: given N exits on a highway which forms a simple cycle, you are supposed to tell the shortest distance between any pair of e
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摘要：Shuffling is a procedure used to randomize a deck of playing cards. Because standard shuffling techniques are seen as weak, and in order to avoid "ins
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摘要：Being unique is so important to people on Mars that even their lottery is designed in a unique way. The rule of winning is simple: one bets on a numbe
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摘要：Given any string of N (≥5) characters, you are asked to form the characters into the shape of U. For example, helloworld can be printed as: That is, t
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摘要：People in Mars represent the colors in their computers in a similar way as the Earth people. That is, a color is represented by a 6-digit number, wher
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摘要：Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 2469135
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摘要：A Digital Library contains millions of books, stored according to their titles, authors, key words of their abstracts, publishers, and published years
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摘要：Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, you are supposed to ou
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摘要：A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number
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摘要：A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal system 73 is a re
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摘要：It is vitally important to have all the cities connected by highways in a war. If a city is occupied by the enemy, all the highways from/toward that c
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摘要：To evaluate the performance of our first year CS majored students, we consider their grades of three courses only: C - C Programming Language, M - Mat
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摘要：With the 2010 FIFA World Cup running, football fans the world over were becoming increasingly excited as the best players from the best teams doing ba
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摘要：Given a pair of positive integers, for example, 6 and 110, can this equation 6 = 110 be true? The answer is yes, if 6 is a decimal number and 110 is a
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摘要：This time, you are supposed to find A×BA\times BA×B where AAA and BBB are two polynomials. Input Specification: Each input file contains one test case
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摘要：The highest building in our city has only one elevator. A request list is made up with N positive numbers. The numbers denote at which floors the elev
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摘要：1007 Maximum Subsequence Sum （25 分） Given a sequence of K integers { N1, N2, ..., NK }. A continuous subsequence is defined to be { Ni, N
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摘要：At the beginning of every day, the first person who signs in the computer room will unlock the door, and the last one who signs out will lock the door
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摘要：Given a non-negative integer N, your task is to compute the sum of all the digits of N, and output every digit of the sum in English. Input Specificat
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摘要：A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. Input Specification: Each inp
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摘要：As an emergency rescue team leader of a city, you are given a special map of your country. The map shows several scattered cities connected by some ro
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摘要：This time, you are supposed to find A+BA+BA+B where AAA and BBB are two polynomials. Input Specification: Each input file contains one test case. Each
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摘要：1001 A+B Format （20 分） Calculate a+b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (un
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