Add day 5 solutions

1 files changed, 38 insertions, 0 deletions

diff --git a/2017/05/puzzles.c b/2017/05/puzzles.c
new file mode 100644
index 0000000..1f78e14
--- /dev/null
+++ b/2017/05/puzzles.c
@@ -0,0 +1,38 @@
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main(void)
+{
+	int n, s;
+	int *jumps;
+	FILE *fp;
+
+	if (!(jumps = calloc(PROGLEN, sizeof(int))))
+		err(EXIT_FAILURE, "calloc");
+	if (!(fp = fopen("input", "r")))
+		err(EXIT_FAILURE, "fopen");
+	for (int i = 0; fscanf(fp, "%d", &n) != EOF; i++)
+		jumps[i] = n;
+	fclose(fp);
+
+	s = 0;
+	for (int i = 0; i >= 0 && i < PROGLEN; s++) {
+#ifdef PART2
+		if (jumps[i] >= 3) {
+			jumps[i]--;
+			i += jumps[i] + 1;
+		} else {
+			jumps[i]++;
+			i += jumps[i] - 1;
+		}
+#else
+		jumps[i]++;
+		i += jumps[i] - 1;
+#endif
+	}
+
+	printf("%d\n", s);
+	return EXIT_SUCCESS;
+}