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authorJune McEnroe <june@causal.agency>2019-12-04 01:45:21 -0500
committerJune McEnroe <june@causal.agency>2020-11-22 00:14:26 -0500
commit1ed2a868560b7ef38c1de4d845b96197dcface0f (patch)
tree4d8581991913b53420ed2a6499035335cd013a62
parentSolve day 3 part 2 (diff)
downloadaoc-1ed2a868560b7ef38c1de4d845b96197dcface0f.tar.gz
aoc-1ed2a868560b7ef38c1de4d845b96197dcface0f.zip
Solve day 4 part 1
-rw-r--r--2019/day04.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/2019/day04.c b/2019/day04.c
new file mode 100644
index 0000000..3c31931
--- /dev/null
+++ b/2019/day04.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+int main(void) {
+	int min, max;
+	scanf("%d-%d", &min, &max);
+	int count = 0;
+	for (int n = min; n <= max; ++n) {
+		char str[7];
+		snprintf(str, sizeof(str), "%d", n);
+		int adj = 0, dec = 0;
+		for (int i = 1; i < 6; ++i) {
+			if (str[i] == str[i - 1]) adj = 1;
+			if (str[i] < str[i - 1]) dec = 1;
+		}
+		if (adj && !dec) count++;
+	}
+	printf("%d\n", count);
+}