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更多“SET是Secure Electronic Transact…”相关的问题
问题描述:给定一个自然数n,由n开始可以依次产生半数集set(n)中的数如下:
(1)n∈set(m);
(2)在n的左边加上一个自然数,但该自然数不能超过最近添加的数的一半:
(3)按此规则进行处理,直到不能再添加自然数为止.
例如,set(6)={6,16,26,126,36,136}.半数集set(6)中有6个元素.注意,该半数集是多重集.
算法设计:对于给定的自然数n,计算半数集set(n)中的元素个数.
数据输入:输入数据由文件名为input.txt的文本文件提供.每个文件只有一行,给出整数n(0＜n＜1000).
结果输出:将计算结果输出到文件output.txt.输出文件只有一行,给出半数集set(n)中的元素个数.
若将森林中的每棵树视作一个等价类，则Kruskal算法迭代过程所涉及的计算不外乎两类：
支持以上操作接口的数据结构，即所谓的独立集(disjoint set)，亦称作并查集(union-find set)。
a)试基于此前介绍过的基本数据结构实现并查集，并用以组织Kruskal算法中的森林;
b)按你的实现，find()和union()接口的复杂度各是多少？相应地，Kruskal算法的复杂度呢？
Directions：Read the following passage and the statements that follow. Choose the best answer for each statement from the four choices marked A, B，C and D.
The Internet is an exciting tool that puts vast information at your fingertips. With a click of a mouse, it lets you buy an airline ticket, book a hotel, send flowers to a friend, or purchase your favorite stock.
Security on the Internet
Shopping online offers lots of benefits that you won’t find while shopping in a store or by mail. The Internet is always open—seven days a week, 24 hours a day—and bargains can be numerous online. Shopping on the Internet is no less safe than shopping in a store or by mail. Keep the following tips in mind to help ensure that your online shopping experience is a safe one.
EASY AS ABC
When exploring online, think ABC to remember the privacy and security questions you should ask about a company.
About me. What information does the company collect from me and is it secure？
Benefits. How does the company use that information and what is the benefit to me？
Choices. What choices do I have about the company’s use of information about me？ Can I choose not to have the information used for other purposes, and how？
1.The real meaning behind “with the click of a mouse” may be ().
A.with the use of computer and internet
B.just the action of clicking the mouse
C.with the information
D.none of the above
2.Which of the following is the most efficient way to reduce age related memory loss()？
A.Eating more meat and doing more exercises.
B.Eating right foods and getting sufficient amounts of sleep
C.Taking more medicine and doing more exercises
D.Taking more herbs and eating more food
3.Most of his savings()in the Xin Hua Bank.
A.has been kept
B.is being kept
C.have kept
D.have been kept
4.By “permissive period in education” the author means a time().
A.when children are allowed to do what they wish to
B.when everything can be taught at school
C.when every child can be educated
D.when children are permitted to receive education
5.Jogging is the best way for stretching and relaxation and helps to reduce many diseases().
A.True
B.False
C.Not Mentioned
6.What is this passage mainly about()？
A.Shopping online safely
B.Differences between shopping online and in the store
C.Internet is convenient
D.Benefits of shopping online
7.We learn from the passage that the author’s mother used to lay emphasis on().
A.learning Latin
B.natural development
C.discipline
D.education at school
8. What’s the main idea of the text()？
A.Chinese fashion designer got start in the industry two decades ago
B.China has made a great difference in latest fashion
C.A small number of established Chinese designers have been in business for less than 10 years
D.The Chinese fashion world is constantly growing
9. The country had little interaction with the outside world, which meant all of the following but().
A.no fashion magazines
B.no designer labels
C.no events like China Fashion Week
D.no fashion designers
10.Jim is the only one of the staff members who()to be promoted.
A.are
B.have been
C.is
D.has been
11.The main idea of the passage is that().
A.parents should leave their children alone
B.kids should have more activities at school
C.it’s time to be more strict with our kids
D.parents should always set a good example to their kids
12.Which of the following is NOT true according to Paragraph 2()？
A.It is shown that one area of the brain known as the hippocampus is important in recalling information
B.The process of creating memories has been already understood and it involves three main steps.
C.Scientists believed that neurons first transform. the sensory stimuli into images in our immediate memory
D.Scientists don’t know exactly how the information is transferred from one area of the brain to another
13.Outdoor learning helps students learn in science and arts().
A.Right
B.Wrong
C.Doesn’t say
14.All that can be done().
A.has done
B.has been done
C.have done
D.have been done
15. What should we do in order to communicate with the foreigners in a proper way()？
A.Shake hands with them whenever you meet the foreigners
B.Be familiar with their culture and use it in a correct way
C.Say “Where are you going？” instead of “Hi, have you had your meal？” when meeting on the street
D.Say nothing to them if we meet them
16.By paragraph 2 we can see Istanbul is().
A.a leisure city
B.a busy city
C.a developed city
D.a developing city
17. According to the text, the following sentences are true except().
A.Chinese designers are looking to foreign countries to find retail success
B.China had little interaction with the outside world two decades ago
C.China has gone from a fashion black hole to an industry hub in twenty years
D.the future of Chinese fashion is bright
