[aoc/2024] Finish day 3

2 files changed, 38 insertions, 0 deletions

diff --git a/aoc/2024/03/part-one.c b/aoc/2024/03/part-one.c
new file mode 100644
index 0000000..0438304
--- /dev/null
+++ b/aoc/2024/03/part-one.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main()
+{
+	size_t x, y, s = 0;
+	while (scanf("%*[^m]") != EOF)
+		if (scanf("mul(%3zu,%3zu", &x, &y) == 2 && getchar() == ')')
+			s += x * y;
+	printf("%zu\n", s);
+	return 0;
+}
diff --git a/aoc/2024/03/part-two.c b/aoc/2024/03/part-two.c
new file mode 100644
index 0000000..4ae337f
--- /dev/null
+++ b/aoc/2024/03/part-two.c
@@ -0,0 +1,27 @@
+#include <stdbool.h>
+#include <stdio.h>
+
+int main()
+{
+	bool d = true;
+	size_t x, y, s = 0;
+	while (scanf("%*[^dm]") != EOF) {
+		if (getchar() == 'd') {
+			int c;
+#define unless(i) if ((c = getchar()) != i && ungetc(c, stdin) == c)
+			unless ('o') continue;
+			unless ('(') {
+				if (scanf("n't()") != EOF)
+					d = false;
+				continue;
+			}
+			unless (')') continue;
+#undef unless
+			d = true;
+		}
+		if (scanf("ul(%3zu,%3zu", &x, &y) == 2 && getchar() == ')' && d)
+			s += x * y;
+	}
+	printf("%zu\n", s);
+	return 0;
+}