lele 通过本文主要向大家介绍了c#字符串组合,c#判断字符串是否为空,c#截取字符串后几位,c#截取字符串前几位,c#替换字符串中的字符等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
本文实例讲述了C#查找字符串所有排列组合的方法。分享给大家供大家参考。具体实现方法如下：
// 1. remove first char
// 2. find permutations of the rest of chars
// 3. Attach the first char to each of those permutations.
// 3.1 for each permutation, move firstChar in all indexes
// to produce even more permutations.
// 4. Return list of possible permutations.
public string[] FindPermutations(string word)
{
if (word.Length == 2)
{
char[] _c = word.ToCharArray();
string s = new string(new char[] { _c[1], _c[0] });
return new string[]
{
word,
s
};
}
List<string> _result = new List<string>();
string[] _subsetPermutations = FindPermutations(word.Substring(1));
char _firstChar = word[0];
foreach (string s in _subsetPermutations)
{
string _temp = _firstChar.ToString() + s;
_result.Add(_temp);
char[] _chars = _temp.ToCharArray();
for (int i = 0; i < _temp.Length - 1; i++)
{
char t = _chars[i];
_chars[i] = _chars[i + 1];
_chars[i + 1] = t;
string s2 = new string(_chars);
_result.Add(s2);
}
}
return _result.ToArray();
}
</div>
希望本文所述对大家的C#程序设计有所帮助。
</div>