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- using System;
- namespace ExamPractice
- {
- class Program
- {
- static void Main(string[] args)
- {
- int n = int.Parse(Console.ReadLine());
- int ni = FindElementN(n);
- Console.WriteLine("N-тия член на редицата е " + ni);
- int recursionNi = recursiveElement(n);
- Console.WriteLine("N-тия член на редицата намерен с рекурсия е " + recursionNi);
- }
- private static int recursiveElement(int n)
- {
- if (n == 1)
- {
- return 1;
- }
- if (n == 2)
- {
- return 3;
- }
- if (n == 3)
- {
- return 4;
- }
- int ni = recursiveElement(n - 1) + recursiveElement(n - 2) - 5 * recursiveElement(n - 3);
- return ni;
- }
- private static int FindElementN(int n)
- {
- int n1 = 1;
- int n2 = 3;
- int n3 = 4;
- int ni = 0;
- for (int i = 4; i <= n; i++)
- {
- ni = n3 + n2 - 5 * n1;
- n1 = n2;
- n2 = n3;
- n3 = ni;
- }
- return ni;
- }
- }
- }
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