public static void Main()
Console.WriteLine("Hello World");
bool hasUniqueChars = new Program().strHasUniqueChars(input);
Console.WriteLine(string.Format("'{0}' has all unique characters", input));
Console.WriteLine(string.Format("'{0}' does not have all unique characters", input));
public bool strHasUniqueChars(string input)
for (int i=0; i<input.Length; i++)
int first = input.IndexOf(input[i]);
int last = input.LastIndexOf(input[i]);