3 files changed, 31 insertions, 0 deletions

diff --git a/mat/euler/14/Makefile b/mat/euler/14/Makefile
new file mode 100644
index 0000000..2def8af
--- /dev/null
+++ b/mat/euler/14/Makefile
@@ -0,0 +1,2 @@
+default:
+	gcc prog.c
diff --git a/mat/euler/14/a.out b/mat/euler/14/a.out
new file mode 100755
index 0000000..8a10ce9
--- /dev/null
+++ b/mat/euler/14/a.out
diff --git a/mat/euler/14/prog.c b/mat/euler/14/prog.c
new file mode 100644
index 0000000..bb0daf6
--- /dev/null
+++ b/mat/euler/14/prog.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <stdlib.h>
+#define COLLATZ(n) n % 2 == 0 ? n / 2 : 3 * n + 1
+int main (int argc, char ** argv) {
+	if (argc != 1+1) {
+		fprintf(stderr, "uporaba: %s <stevilo>\nprimer-najd. collatzova veriga pod zač. 1M: %s 1000000\n", argv[0], argv[0]);
+		return 1;
+	}
+	unsigned long int n = strtol(argv[1], NULL, 10);
+	unsigned long int c = 0; // števeC
+	unsigned long int a = 0; // verigA
+	unsigned long int m = 0; // maksimalna dolžina verige
+	unsigned long int z = 0; // trenutna Zmagovalna številka z najdaljšo verigo
+	for (; n >= 1; n--) {
+		// fprintf(stderr, "\rračunam... potrebnih še %lu iteracij.", n); // botlnck
+		a = n;
+		c = 1;
+		while (a != 1) {
+			a = COLLATZ(a);
+			c++;
+		}
+		if (c > m) {
+			m = c;
+			z = n;
+		}
+	}
+	fprintf(stdout, "\rkonec. najdaljša veriga se začne z %lu in ima %lu elementov.\n", z, m);
+	return 0;
+}