commit 5104f5b0d65bab5b35ee0dd800b0916b9a56e30a
parent cb1be5546961a385df7e06ade4d286e8ca2f6b5e
Author: Jake Bauer <jbauer@paritybit.ca>
Date: Sun, 4 Dec 2022 15:22:39 -0500
Day 4 challenge complete
Diffstat:
| A | day4/input.txt | | | 1000 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | day4/main.c | | | 82 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 1082 insertions(+), 0 deletions(-)
diff --git a/day4/input.txt b/day4/input.txt
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diff --git a/day4/main.c b/day4/main.c
@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <err.h>
+
+void
+splitString(char *string, char delim, char **result)
+{
+ int index = 0;
+ for (int i = 0; i < strlen(string); i++)
+ {
+ if (string[i] == delim)
+ index++;
+ else
+ strncat(result[index], &string[i], 1);
+ }
+}
+
+int
+main (void)
+{
+ FILE *fp = fopen("input.txt", "r");
+ if (fp == NULL)
+ {
+ err(1, "Failed to open input.txt");
+ exit(EXIT_FAILURE);
+ }
+
+ int fullOverlaps = 0;
+ int overlaps = 0;
+
+ char *line = NULL;
+ size_t linesize = 0;
+ ssize_t linelen = 0;
+ while ((linelen = getline(&line, &linesize, fp)) != -1)
+ {
+ line[linelen-1] = '\0'; // cut off the newline
+
+ // Is there a better way to allocate memory for this?
+ char *ranges[2]; ranges[0] = malloc(8); ranges[1] = malloc(8);
+ char *range1[2]; range1[0] = malloc(8); range1[1] = malloc(8);
+ char *range2[2]; range2[0] = malloc(8); range2[1] = malloc(8);
+
+ splitString(line, ',', ranges);
+ splitString(ranges[0], '-', range1);
+ splitString(ranges[1], '-', range2);
+
+ // Simple comparisons. I wonder if there's a mathematically
+ // clever way to solve this...
+ if (atoi(range1[0]) >= atoi(range2[0])
+ && atoi(range1[1]) <= atoi(range2[1]))
+ {
+ fullOverlaps++;
+ overlaps++;
+ }
+ else if (atoi(range1[0]) <= atoi(range2[0])
+ && atoi(range1[1]) >= atoi(range2[1]))
+ {
+ fullOverlaps++;
+ overlaps++;
+ }
+ else if (atoi(range1[0]) <= atoi(range2[1])
+ && atoi(range1[1]) >= atoi(range2[0]))
+ {
+ overlaps++;
+ }
+ else if (atoi(range1[0]) >= atoi(range2[1])
+ && atoi(range1[1]) <= atoi(range2[0]))
+ {
+ overlaps++;
+ }
+ }
+ free(line);
+ if (ferror(fp))
+ err(1, "getline");
+ fclose(fp);
+
+ printf("PART 1: There are %d pairs in which one range fully contains the other.\n", fullOverlaps);
+ printf("PART 2: There are %d pairs which overlap.\n", overlaps);
+
+ exit(EXIT_SUCCESS);
+}
