advent-of-code-2022

commit 9695f4ac3efce74cd6473751dc766081acd8e8ef
parent 82e914344d52f9b4c56f83742a0d9dfa495a6e75
Author: Jake Bauer <jbauer@paritybit.ca>
Date:   Sun, 11 Dec 2022 23:23:10 -0500

Day 10 challenge complete

Diffstat:
A
day10/input.txt
 | 
146
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
day10/main.c
 | 
78
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 224 insertions(+), 0 deletions(-)
diff --git a/day10/input.txt b/day10/input.txt
@@ -0,0 +1,146 @@
+noop
+noop
+addx 15
+addx -10
+noop
+noop
+addx 3
+noop
+noop
+addx 7
+addx 1
+addx 4
+addx -1
+addx 1
+addx 5
+addx 1
+noop
+noop
+addx 5
+addx -1
+noop
+addx 3
+noop
+addx 3
+addx -38
+noop
+addx 3
+addx 2
+addx 5
+addx 2
+addx 26
+addx -21
+addx -2
+addx 5
+addx 2
+addx -14
+addx 15
+noop
+addx 7
+noop
+addx 2
+addx -22
+addx 23
+addx 2
+addx 5
+addx -40
+noop
+noop
+addx 3
+addx 2
+noop
+addx 24
+addx -19
+noop
+noop
+noop
+addx 5
+addx 5
+addx 2
+noop
+noop
+noop
+noop
+addx 7
+noop
+addx 3
+noop
+addx 3
+addx -2
+addx 2
+addx 5
+addx -38
+noop
+noop
+noop
+addx 5
+addx 2
+addx -1
+addx 2
+addx 30
+addx -23
+noop
+noop
+noop
+noop
+addx 3
+addx 5
+addx -11
+addx 12
+noop
+addx 6
+addx 1
+noop
+addx 4
+addx 3
+noop
+addx -40
+addx 4
+addx 28
+addx -27
+addx 5
+addx 2
+addx 5
+noop
+noop
+addx -2
+addx 2
+addx 5
+addx 3
+noop
+addx 2
+addx -25
+addx 30
+noop
+addx 3
+addx -2
+addx 2
+addx 5
+addx -39
+addx 29
+addx -27
+addx 5
+noop
+noop
+noop
+addx 4
+noop
+addx 1
+addx 2
+addx 5
+addx 2
+noop
+noop
+noop
+noop
+addx 5
+addx 1
+noop
+addx 2
+addx 5
+addx -32
+addx 34
+noop
+noop
+noop
+noop
diff --git a/day10/main.c b/day10/main.c
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <err.h>
+
+int
+sampleValues(int x, int cycle)
+{
+	// Could compact this with cycle - 20 % 40
+	switch (cycle)
+	{
+		case 20:
+		case 60:
+		case 100:
+		case 140:
+		case 180:
+		case 220: return x * cycle;
+	}
+	return 0;
+}
+
+void
+drawPixel(int x, int cycle)
+{
+	if ((cycle - 1) % 40 >= x - 1 && (cycle - 1) % 40 <= x + 1)
+		printf("#");
+	else
+		printf(" ");
+
+	if (cycle % 40 == 0)
+		printf("\n");
+}
+
+int
+main (void)
+{
+	FILE *fp = fopen("input.txt", "r");
+	if (fp == NULL)
+	{
+		err(1, "Failed to open input.txt");
+		exit(EXIT_FAILURE);
+	}
+
+
+	int x = 1;
+	int cycle = 0;
+	int change = 0;
+	int sum = 0;
+
+	char *line = NULL;
+	size_t linesize = 0;
+	ssize_t linelen = 0;
+	while ((linelen = getline(&line, &linesize, fp)) != -1)
+	{
+		line[--linelen] = '\0'; // cut off the newline
+		change = atoi(&line[5]);
+
+		cycle++;
+		drawPixel(x, cycle);
+		sum += sampleValues(x, cycle);
+
+		if (line[0] == 'a')
+		{
+			cycle++;
+			drawPixel(x, cycle);
+			sum += sampleValues(x, cycle);
+			x += change;
+		}
+	}
+	free(line);
+	if (ferror(fp))
+		err(1, "getline");
+	fclose(fp);
+
+	printf("PART 1: %d\n", sum);
+
+	exit(EXIT_SUCCESS);
+}