Added my works from 2022

alg_4_4.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+using namespace std;
+
+int f(int n, int sum)
+{
+	if (n == 0)
+	{
+		return sum;
+	}
+	return f(n / 10, sum + n % 10);
+}
+
+int main()
+{
+	int n; cin >> n;
+
+	cout << f(n, 0);
+}