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遞歸實現
·與第一個交換
·遞歸
*pch 與 *begin 之間的交換與復原
for (char* pch = pbegin; *pch != '\0'; ++pch)
{
char temp = *pch;
*pch = *pbegin;
*pbegin = temp;
permutation(pstr, pbegin + 1);
temp = *pch;
*pch = *pbegin;
*pbegin = temp;
}
http://zhedahht.blog.163.com/blog/static/254111742007499363479/
1 #include <iostream>
2 using namespace std;
3
4 void permutation(char* pstr, char* pbegin)
5 {
6 if (pstr == 0 || pbegin == 0)
7 {
8 return;
9 }
10 if (*pbegin == '\0')
11 {
12 cout << pstr << endl;
13 }
14 else
15 {
16 for (char* pch = pbegin; *pch != '\0'; ++pch)
17 {
18 char temp = *pch;
19 *pch = *pbegin;
20 *pbegin = temp;
21
22 permutation(pstr, pbegin + 1);
23
24 temp = *pch;
25 *pch = *pbegin;
26 *pbegin = temp;
27 }
28 }
29 }
30
31 void perm(char* str)
32 {
33 permutation(str, str);
34 }
35
36 int main()
37 {
38 char s[4] = "abc";
39 perm(s);
40 }
posted on 2011-09-13 13:00
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