C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
	
   public static List<string> SinglePermutations(string s)
   {
       if (s.Length == 0) return new List<string>();
       if (s.Length == 1) return new List<string>(new [] { s });
       if (s.Length == 2) return new List<string>(new string[] { "" + s[0] + s[1], "" + s[1] + s[0] });
       return SinglePermutations(s[1..])
         .SelectMany(p => Enumerable.Range(0, p.Length).Select(i => p[0..i] + s[0] + p[i..])).Distinct().ToList();
   }

 
using System;
    
   public static List<string> SinglePermutations(string s)
   {
       if (s.Length == 0) return new List<string>();
       if (s.Length == 1) return new List<string>(new [] { s });
       if (s.Length == 2) return new List<string>(new string[] { "" + s[0] + s[1], "" + s[1] + s[0] });
       return SinglePermutations(s[1..])
         .SelectMany(p => Enumerable.Range(0, p.Length).Select(i => p[0..i] + s[0] + p[i..])).Distinct().ToList();
   }

Compilation error (line 3, col 4): The modifier 'public' is not valid for this item
Compilation error (line 5, col 38): The type or namespace name 'List<>' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 6, col 38): The type or namespace name 'List<>' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 7, col 38): The type or namespace name 'List<>' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 3, col 18): The type or namespace name 'List<>' could not be found (are you missing a using directive or an assembly reference?)

Last Run:	3:32:45 pm
Compile:	0.006s
Execute:	0s
Memory:	0b
CPU:	0s

View IL Code