c how fast

1 files changed, 92 insertions, 0 deletions

diff --git a/2022/01/solve.c b/2022/01/solve.c
new file mode 100644
index 0000000..d916f8e
--- /dev/null
+++ b/2022/01/solve.c
@@ -0,0 +1,92 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+static int part_one(FILE *fp)
+{
+	int res = 0;
+
+	char *line = NULL;
+	size_t len = 0;
+
+	int current = 0;
+	while (getline(&line, &len, fp) != -1) {
+		if (line[0] == '\n') {
+			if (current > res)
+				res = current;
+			current = 0;
+			continue;
+		}
+
+		int num;
+		sscanf(line, "%d\n", &num);
+		current += num;
+	}
+
+	if (line)
+		free(line);
+
+	return res;
+}
+
+static int sum(int maxes[3])
+{
+	int s = 0;
+	for (int i = 0; i < 3; i++)
+		s += maxes[i];
+	return s;
+}
+
+static void replace_min(int maxes[3], int replace)
+{
+	int s = 0;
+	for (int i = 0; i < 3; i++)
+		if (maxes[i] < maxes[s])
+			s = i;
+	if (replace > maxes[s])
+		maxes[s] = replace;
+}
+
+static int part_two(FILE *fp)
+{
+	char *line = NULL;
+	size_t len = 0;
+
+	int maxes[3] = { 0 };
+
+	int current = 0;
+	while (getline(&line, &len, fp) != -1) {
+		if (line[0] == '\n') {
+			replace_min(maxes, current);
+			current = 0;
+			continue;
+		}
+
+		int num;
+		sscanf(line, "%d\n", &num);
+		current += num;
+	}
+	replace_min(maxes, current);
+
+	if (line)
+		free(line);
+
+	return sum(maxes);
+}
+
+int main(void)
+{
+	FILE *fp = fopen("input", "r");
+	if (!fp)
+		exit(EXIT_FAILURE);
+
+	clock_t tic = clock();
+	printf("%d\n", part_one(fp));
+	rewind(fp);
+	printf("%d\n", part_two(fp));
+	clock_t toc = clock();
+	printf("TIME: %f seconds\n", (double)(toc - tic) / CLOCKS_PER_SEC);
+
+	fclose(fp);
+	return 0;
+}