From 0ac9224655469a99a367869e9a36c39a44c72cb6 Mon Sep 17 00:00:00 2001
From: sijanec <sijanecantonluka@gmail.com>
Date: Mon, 7 Dec 2020 00:29:25 +0100
Subject: =?UTF-8?q?nekaj=20=C4=87aral=20pri=20eulerju,=20ampak=20prete?=
 =?UTF-8?q?=C5=BEko..=20ju3?=
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---
 mat/euler/14/Makefile |   2 ++
 mat/euler/14/a.out    | Bin 0 -> 8432 bytes
 mat/euler/14/prog.c   |  29 +++++++++++++++++++++++++++++
 mat/euler/15/Makefile |   2 ++
 mat/euler/15/a.out    | Bin 0 -> 8432 bytes
 mat/euler/15/prog.c   |  24 ++++++++++++++++++++++++
 6 files changed, 57 insertions(+)
 create mode 100644 mat/euler/14/Makefile
 create mode 100755 mat/euler/14/a.out
 create mode 100644 mat/euler/14/prog.c
 create mode 100644 mat/euler/15/Makefile
 create mode 100755 mat/euler/15/a.out
 create mode 100644 mat/euler/15/prog.c

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
Binary files /dev/null and b/mat/euler/14/a.out differ
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;
+}
diff --git a/mat/euler/15/Makefile b/mat/euler/15/Makefile
new file mode 100644
index 0000000..2def8af
--- /dev/null
+++ b/mat/euler/15/Makefile
@@ -0,0 +1,2 @@
+default:
+	gcc prog.c
diff --git a/mat/euler/15/a.out b/mat/euler/15/a.out
new file mode 100755
index 0000000..cd711e5
Binary files /dev/null and b/mat/euler/15/a.out differ
diff --git a/mat/euler/15/prog.c b/mat/euler/15/prog.c
new file mode 100644
index 0000000..4151bfb
--- /dev/null
+++ b/mat/euler/15/prog.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <stdlib.h>
+int main (int argc, char ** argv) {
+	if (argc != 1+1) {
+		fprintf(stderr, "uporaba: %s <stevilka>\nprimer za mrežo 20x20: %s 20\n", argv[0], argv[0]);
+		return 1;
+	}
+	unsigned long int n = strtol(argv[1], NULL, 10);
+	unsigned long int s = 0; // Seštevek
+	unsigned long int i = 0; // Index iteracije
+	unsigned long int x = 0; // X
+	for (i = 0; i <= n-1; i++) {
+		// najprej diagonale
+			fprintf(stderr, "%lu\n", i);
+		s = s + (n-(i))+(n-(i));
+	}
+	for (i = 1; i <= n; i++) {
+		for (x = 0; x <= i-1; x++) {
+			s = s + 2*( (n-i)+(n-(x+1)) );
+		}
+	}
+	fprintf(stdout, "rezultat je: %lu\n", s);
+	return 0;
+}
-- 
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