Задача: Исходный массив

FindOriginArray.cs

using System;
					
public class Program
{
	public static int[] FindOriginArray(int[] pref)
	{
		int[] res = new int[pref.Length];
		res[0] = pref[0];
		for (int i = 1; i < pref.Length; i++)
		{
		     res[i] = pref[i - 1] ^ pref[i];
		}
		return res;
	}
	
	public static void Main()
	{
		Console.WriteLine("UniLecs");
		
		// tests
		Console.WriteLine(string.Join(", ", FindOriginArray(new int[] { 5, 2, 0, 3, 1 }))); // [5, 7, 2, 3, 2]
	}
}