012章 绪论+向量

02E-2 QUIZ

Which situation will the improved blistering order will end prematurely ? 
经改进的起泡排序在什么情况下会提前结束？

 

Complete all n-1 scans 
完成全部n-1趟扫描交换

The number of scan conversions completed = The number of scan switching parameters for the actual element exchange + 1 
完成的扫描交换趟数 = 实际发生元素交换的扫描交换趟数 + 1   正确

The number of scan conversions completed = The number of scan switchings that actually took place for element exchange 
完成的扫描交换趟数 = 实际发生元素交换的扫描交换趟数

Complete (n - 1) / 2 scan exchange 
完成 (n - 1) / 2趟扫描交换

EXPLANATION

Another statement is: No element exchange occurs in a scan switch 
另一个说法是：某趟扫描交换中没有发生元素交换

02-D3-3 QUIZ

V={1, 2, 3, 4, 5, 6, 7}, using Fibonacci to find element 1 in V, the element selected as the pivot point mi is:
V={1, 2, 3, 4, 5, 6, 7}，在V中用Fibonacci查找元素1，被选取为轴点mi的元素依次是：

 

Rank mi = lo + fib.get() - 1;

是元素不是索引

4, 3, 2, 14, 2, 15,2,15,3,2,1

5321

 

实例A

V={2, 3, 5, 7, 11, 13, 17}. How many comparisons V.search(16, 0, 7) need to make? 
V={2, 3, 5, 7, 11, 13, 17}。V.search(16, 0, 7)需要进行多少次比较？

 

lo = 0, hi = 7;

hi在区间外！！

4567

7次

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01B-5: 图灵机

Which of the following is NOT a component of a Turing machine? 以下哪项不是图灵机的组成要件？

A tape of finite length 有限长的纸带 A tape of finite length 有限长的纸带 - 正确

A finite alphabet 有限的字母表

A finite set of states 有限种状态

A head for reading and writing 读写头

01-E-5: 数组倒置

The base cases of a recursive function are degenerated cases, without which the sequence of recursive function calls would go forever.

01XC-2: FIB()：递推方程

The naive way of computing fib(n) recursively leads to a time complexity of 
直接用定义以递归的方式计算fib(n)的时间复杂度是：

 

Θ(n2)

O(2n)  正确

Θ(2n)

O(n)