From 9d135163093485edc906de93e1604e0ef325fe97 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Tue, 21 Dec 2021 14:12:43 +0100
Subject: aah

---
 2021/21/solve.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 2021/21/solve.c

(limited to '2021/21/solve.c')

diff --git a/2021/21/solve.c b/2021/21/solve.c
new file mode 100644
index 0000000..0d21a45
--- /dev/null
+++ b/2021/21/solve.c
@@ -0,0 +1,84 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define ABS(a) ((a) < 0 ? -(a) : (a))
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
+#define MAX(a, b) (((a) > (b)) ? (a) : (b))
+#define COUNT(a) ((int)(sizeof(a) / sizeof 0 [a]))
+
+#define FORLINE                                                                                    \
+	char *line = NULL;                                                                         \
+	size_t len = 0;                                                                            \
+	while (getline(&line, &len, fp) != EOF)
+#define FREELINE                                                                                   \
+	if (line)                                                                                  \
+	free(line)
+
+#define FORCH                                                                                      \
+	char ch = 0;                                                                               \
+	while ((ch = fgetc(fp)) != EOF)
+
+#define WHOLE                                                                                      \
+	fseek(fp, 0, SEEK_END);                                                                    \
+	long fsize = ftell(fp);                                                                    \
+	fseek(fp, 0, SEEK_SET);                                                                    \
+	char *data = malloc(fsize + 1);                                                            \
+	fread(data, 1, fsize, fp);                                                                 \
+	data[fsize] = 0;
+
+static int part_one(FILE *fp)
+{
+	int pos1, pos2;
+	fscanf(fp, "Player 1 starting position: %d\nPlayer 2 starting position: %d", &pos1, &pos2);
+
+	int score1 = 0, score2 = 0;
+	int player = 0;
+	int a = 1, b = 2, c = 3;
+	int aah = 0;
+	while (score1 < 1000 && score2 < 1000) {
+		aah += 3;
+		if (player == 0) {
+			pos1 += (a += 3) + (b += 3) + (c += 3);
+			if (pos1 > 10)
+				pos1 = pos1 % 10 + 1;
+			score1 += pos1;
+			player = 1;
+		} else if (player == 1) {
+			pos2 += (a += 3) + (b += 3) + (c += 3);
+			if (pos2 > 10)
+				pos2 = pos2 % 10 + 1;
+			score2 += pos2;
+			player = 0;
+		}
+	}
+
+	return MIN(score1, score2) * aah;
+}
+
+static int part_two(FILE *fp)
+{
+	int res = 0;
+
+	return res;
+}
+
+int main(int argc, char *argv[])
+{
+	(void)argc;
+	(void)argv;
+
+	FILE *fp = fopen("input", "r");
+	if (!fp)
+		exit(EXIT_FAILURE);
+
+	clock_t tic = clock();
+	printf("%d\n", part_one(fp));
+	rewind(fp);
+	printf("%d\n", part_two(fp));
+	clock_t toc = clock();
+	printf("TIME: %f seconds\n", (double)(toc - tic) / CLOCKS_PER_SEC);
+
+	fclose(fp);
+	return 0;
+}
-- 
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