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一个无聊男人的疯狂《数据结构与算法分析-C++描述》学习笔记 习题2.8 随机数组的三种生成算法(补) 将bash的实现翻译成比较纯正的bash风格

 
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一个无聊男人的疯狂《数据结构与算法分析-C++描述》学习笔记 7)习题2.8 随机数组的三种生成算法补 将bash的实现翻译成比较纯正的bash风格

write by 九天雁翎(JTianLing) -- blog.csdn.net/vagrxie

<<Data Structures and Algorithm Analysis in C++>>

--《数据结构与算法分析c++描述》 Mark Allen Weiss 人民邮电大学出版 中文版第49面, 一随机数组的三种生成算法

由于偷懒我最近老是喜欢用bashC语言(其实好像是csh)中引进的语法,所以感觉都不是那么纯粹的bash风格(但是其实bash的风格我本来就不 喜欢),老是学了不用,有一天写bash都当C语言在写就完了。今天加班比较晚,就不搞什么新内容了,将2.8bash实现翻译成了比较纯粹的bash 风格。。。。对于没有接触过Bash的人来说更加接近天书了,enjoy it......(I hope you can)


1 #!/usr/bin/env bash
2
3 # just for a range rand....let me die....
4 # what I had said? bash is not a good
5 # language for describing algorithms
6 randInt()
7 {
8 locala=$1
9 localb=$2
10
11 if["$a"-gt"$b"]
12 then
13 localtemp=$a
14 a=$b
15 b=$temp
16 fi
17
18 localmi=$(($b-$a+1))
19 localr=$((RANDOM%${mi}+${a}))
20 echo-n $r
21 }
22
23 randArr1()
24 {
25 # only one argument because I hate the
26 # bash's indirect reference
27 # you can reference the (4) binarySearch to
28 # see what I said
29 localn=$1
30 fori in`seq $n`
31 do
32 whiletrue
33 do
34 temp=`randInt 1$n`
35 j=1
36 while["$j"-lt"$i"]
37 do
38 if[${a[j]}-eq"$temp"]
39 then
40 break
41 fi
42 j=$(($j+1))
43 done
44 if["$j"-eq"$i"]
45 then
46 a[j]=$temp
47 break
48 fi
49 done
50 done
51
52 echo${a[*]}
53 }
54
55 randArr2()
56 {
57 localn=$1
58 # used for bool array
59 fori in`seq $n`
60 do
61 whiletrue
62 do
63 localtemp=`randInt 1$n`
64 if[-z${b[temp]}]
65 then
66 a[i]=$temp
67 b[temp]=true
68 break
69 fi
70 done
71 done
72
73 echo${a[*]}
74 }
75
76 randArr3()
77 {
78 localn=$1
79 fori in`seq $n`
80 do
81 a[i]=$i
82 done
83 fori in`seq $n`
84 do
85 localtemp=`randInt 1$n`
86 t=${a[i]}
87 a[i]=${a[temp]}
88 a[temp]=$t
89 done
90
91 echo${a[*]}
92 }
93
94 # so slow that I can't bear it run 100 times
95 randArr1 10
96 randArr2 10
97 randArr3 10
98

write by 九天雁翎(JTianLing) -- blog.csdn.net/vagrxie

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