From 46b95a2f1d484eed878202f204561932dd9c548b Mon Sep 17 00:00:00 2001
From: Mart Lubbers <mart@martlubbers.net>
Date: Mon, 6 Dec 2021 07:00:24 +0100
Subject: [PATCH] day 6

---
 03b.c    | 12 +++++-------
 06.txt   |  1 +
 06a.c    | 34 ++++++++++++++++++++++++++++++++++
 06b.c    | 34 ++++++++++++++++++++++++++++++++++
 06e.txt  |  1 +
 Makefile |  2 +-
 6 files changed, 76 insertions(+), 8 deletions(-)
 create mode 100644 06.txt
 create mode 100644 06a.c
 create mode 100644 06b.c
 create mode 100644 06e.txt

diff --git a/03b.c b/03b.c
index c940822..2213374 100644
--- a/03b.c
+++ b/03b.c
@@ -35,16 +35,14 @@ int main(void)
 	unsigned numbers[2000] = {0};
 	int c = 0, y = 0, maxbits = 0, bits = 0;
 	while ((c = getchar()) != EOF) {
-		if (c == '0') {
-			numbers[y] = numbers[y]*2;
-			bits++;
-		} else if (c == '1') {
-			numbers[y] = numbers[y]*2+1;
-			bits++;
-		} else if (c == '\n') {
+		if (c == '\n') {
 			maxbits = bits > maxbits ? bits : maxbits;
 			bits = 0;
 			y++;
+		} else {
+			numbers[y] *= 2;
+			if (c == '1')
+				numbers[y]++;
 		}
 	}
 
diff --git a/06.txt b/06.txt
new file mode 100644
index 0000000..b800e1c
--- /dev/null
+++ b/06.txt
@@ -0,0 +1 @@
+1,5,5,1,5,1,5,3,1,3,2,4,3,4,1,1,3,5,4,4,2,1,2,1,2,1,2,1,5,2,1,5,1,2,2,1,5,5,5,1,1,1,5,1,3,4,5,1,2,2,5,5,3,4,5,4,4,1,4,5,3,4,4,5,2,4,2,2,1,3,4,3,2,3,4,1,4,4,4,5,1,3,4,2,5,4,5,3,1,4,1,1,1,2,4,2,1,5,1,4,5,3,3,4,1,1,4,3,4,1,1,1,5,4,3,5,2,4,1,1,2,3,2,4,4,3,3,5,3,1,4,5,5,4,3,3,5,1,5,3,5,2,5,1,5,5,2,3,3,1,1,2,2,4,3,1,5,1,1,3,1,4,1,2,3,5,5,1,2,3,4,3,4,1,1,5,5,3,3,4,5,1,1,4,1,4,1,3,5,5,1,4,3,1,3,5,5,5,5,5,2,2,1,2,4,1,5,3,3,5,4,5,4,1,5,1,5,1,2,5,4,5,5,3,2,2,2,5,4,4,3,3,1,4,1,2,3,1,5,4,5,3,4,1,1,2,2,1,2,5,1,1,1,5,4,5,2,1,4,4,1,1,3,3,1,3,2,1,5,2,3,4,5,3,5,4,3,1,3,5,5,5,5,2,1,1,4,2,5,1,5,1,3,4,3,5,5,1,4,3
diff --git a/06a.c b/06a.c
new file mode 100644
index 0000000..92a1b8a
--- /dev/null
+++ b/06a.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main()
+{
+	char buf[1000];
+	if (fgets(buf, 1000, stdin) == NULL)
+		return 1;
+	long fish0[9] = {0};
+	long fish1[9] = {0};
+	long *this = &fish0[0];
+	long *that = &fish1[0];
+
+	char *p = strtok(buf, ",");
+	this[atoi(p)]++;
+	while ((p = strtok(NULL, ",")) != NULL)
+		this[atoi(p)]++;
+
+	for (long day = 0; day<80; day++) {
+		that[8] = this[0];
+		for (long i = 0; i<8; i++)
+			that[i] = this[i+1];
+		that[6] += this[0];
+		long *tmp = this;
+		this = that;
+		that = tmp;
+	}
+
+	long sum = 0;
+	for (long i = 0; i<=8; i++)
+		sum += this[i];
+	printf("%lu\n", sum);
+}
diff --git a/06b.c b/06b.c
new file mode 100644
index 0000000..abc9892
--- /dev/null
+++ b/06b.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main()
+{
+	char buf[1000];
+	if (fgets(buf, 1000, stdin) == NULL)
+		return 1;
+	long fish0[9] = {0};
+	long fish1[9] = {0};
+	long *this = &fish0[0];
+	long *that = &fish1[0];
+
+	char *p = strtok(buf, ",");
+	this[atoi(p)]++;
+	while ((p = strtok(NULL, ",")) != NULL)
+		this[atoi(p)]++;
+
+	for (long day = 0; day<256; day++) {
+		that[8] = this[0];
+		for (long i = 0; i<8; i++)
+			that[i] = this[i+1];
+		that[6] += this[0];
+		long *tmp = this;
+		this = that;
+		that = tmp;
+	}
+
+	long sum = 0;
+	for (long i = 0; i<=8; i++)
+		sum += this[i];
+	printf("%lu\n", sum);
+}
diff --git a/06e.txt b/06e.txt
new file mode 100644
index 0000000..55129f1
--- /dev/null
+++ b/06e.txt
@@ -0,0 +1 @@
+3,4,3,1,2
diff --git a/Makefile b/Makefile
index dfdd641..5da4afc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 CFLAGS:=-Wall -Wextra -O3
 LFLAGS:=-f
 
-BINARIES:=$(foreach num,$(shell seq -f '%02.0f' 1 5),$(num)a $(num)b)
+BINARIES:=$(foreach num,$(shell seq -f '%02.0f' 1 6),$(num)a $(num)b)
 
 all: $(BINARIES)
 
-- 
2.20.1