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StringPermutation.cs
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51 lines (44 loc) · 1.09 KB
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using System;
using System.Collections.Generic;
using System.Data.SqlTypes;
namespace ConsoleApplication21
{
internal static class Program
{
public static void Main(string[] args)
{
const string s = "ABCDEF";
var arr = s.ToCharArray();
GetPermutation(arr);
}
private static void GetPermutation(char[] arr)
{
var x = arr.Length - 1;
GetPer(arr, 0, x);
}
private static void GetPer(char[] arr, int k, int m)
{
if (k == m)
Console.WriteLine(arr);
else
{
for (var i = k; i <= m; i++)
{
Swap(ref arr[k], ref arr[i]);
GetPer(arr, k + 1, m);
Swap(ref arr[k], ref arr[i]);
}
}
}
private static void Swap(ref char c, ref char c1)
{
if (c == c1)
{
return;
}
c ^= c1;
c1 ^= c;
c ^= c1;
}
}
}