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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 用C++/lua/python/bash的四重实现(4)二分搜索算法

 
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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 用C++/lua/python/bash的四重实现4)二分搜索算法

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44面,图2-9二分搜索算法

二分搜索是很著名也很实用的算法,在排序中查找的速度从算法分析角度来说已经是最快的了。O(logN)

这里费了点心,将bash都实现了,扭曲啊,扭曲,光是传递一个数组参数都折腾了半天,最后还是通过所谓的间接引用然后用for重新赋值才实现我想要的数组,再次认为bash的算法描述语法混乱不堪。。。。其实bash只有命令调用的语法好用而已(个人见解),但是碰到我这样无聊的人,偏偏要用bash去实现算法。。。那就只能稍微偷点懒了,用了bashC语言语法部分。

以下4个算法都是一样的,测试时为了统一结果,消除因为cpp,python数组从0开始,lua,bash数组从1开始的问题,测试时,cpp,python-1开始测试。最后测试完成的结果完全一致,来个有意思的截图:

我编码的时候平铺4putty窗口,正好占满我的19寸屏:)

从左自右依次是cpp,lua,python,bash


以下是源代码:


CPP:

1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <vector>
4 #include <iostream>
5 usingnamespacestd;
6 template<typenameT>
7 intbinarySearch(constvector<T> &a, constT &x, int& aiTimes)
8 {
9 intlow = 0;
10 inthigh = a.size() - 1;
11
12 while(low <= high)
13 {
14 ++aiTimes;
15 intmid = (low + high) / 2;
16
17 if(a[mid] < x)
18 {
19 low = mid + 1;
20 }
21 elseif(a[mid] > x)
22 {
23 high = mid - 1;
24 }
25 else
26 {
27 returnmid;
28 }
29 }
30
31 return-1;
32 }
33
34 intmain(intargc, char* argv[])
35 {
36 vector<int> lveci;
37 lveci.resize(100);
38 for(inti = 0; i < 100; ++i)
39 {
40 lveci[i] = i;
41 }
42
43 intliTimes = 0;
44 cout << binarySearch(lveci, -1, liTimes);
45 cout <<"/tcost:"<<liTimes <<endl;
46 liTimes = 0;
47 cout << binarySearch(lveci, 0, liTimes);
48 cout <<"/tcost:"<<liTimes <<endl;
49 liTimes = 0;
50 cout << binarySearch(lveci, 1, liTimes);
51 cout <<"/tcost:"<<liTimes <<endl;
52 liTimes = 0;
53 cout << binarySearch(lveci, 2, liTimes);
54 cout <<"/tcost:"<<liTimes <<endl;
55 liTimes = 0;
56 cout << binarySearch(lveci, 100, liTimes);
57 cout <<"/tcost:"<<liTimes <<endl;
58
59
60
61 exit(0);
62 }
63



LUA:

1 #!/usr/bin/env lua
2 functionbinarySearch(a, v)
3 low = 1
4 high = #a
5
6 times = 0
7 while(low <= high) do
8 times = times + 1
9 mid = math.floor(( low + high) / 2)
10 ifa[mid] < vthen
11 low = mid + 1
12 elseifa[mid] > v then
13 high = mid - 1
14 else
15 returnmid,times
16 end
17 end
18
19 return-1,times
20 end
21
22 -- test code
23 array = {}
24 fori=1,100do
25 array[i] = i
26 end
27
28 print(binarySearch(array, 0))
29 print(binarySearch(array, 1))
30 print(binarySearch(array, 2))
31 print(binarySearch(array, 3))
32 print(binarySearch(array, 101))
33



PYTHON:

1 #!/usr/bin/env python
2
3 defbinarySearch(a, v):
4 low = 0
5 high = len(a) - 1
6 times = 0
7
8 whilelow <= high:
9 times += 1
10 mid = (low + high) // 2
11
12 ifv > a[mid]:
13 low = mid + 1
14 elifv < a[mid]:
15 high = mid - 1
16 else:
17 returnmid,times
18
19 return-1,times
20
21 array = range(100)
22 printbinarySearch(array, -1)
23 printbinarySearch(array, 0)
24 printbinarySearch(array, 1)
25 printbinarySearch(array, 2)
26 printbinarySearch(array, 100)
27
28



BASH:

1 #!/usr/bin/env bash
2
3
4 binarySearch()
5 {
6 v=$2
7 an="$1[@]"
8 a=${!an}
9 fori in$a
10 do
11 ar[i]=$i
12 done
13 low=1
14 high=${#ar[*]}
15 ((times=0))
16
17 while((low <=high ))
18 do
19 ((++times))
20 ((mid=(low+high)/2))
21 #echo -n " mid="$mid
22 #echo -n " ar[mid]="${ar[mid]}
23 if((v >ar[mid]))
24 then
25 ((low =mid+ 1))
26 elif((v <ar[mid]))
27 then
28 ((high =mid- 1))
29 else
30 #echo -e "/nTimes="$times
31 return$mid
32 fi
33 done
34
35 #echo -e "/nTimes="$times
36 return-1
37 }
38
39 for((i=1;i<=100;++i))
40 do
41 ((array[i]=i ))
42 done
43
44 binarySearch array 0
45 echo-e "$?/t$times"
46 binarySearch array 1
47 echo-e "$?/t$times"
48 binarySearch array 2
49 echo-e "$?/t$times"
50 binarySearch array 3
51 echo-e "$?/t$times"
52 binarySearch array 101
53 echo-e "$?/t$times"
54
55 exit0

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

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