From c83970e459635609f7b4520f4f73db8f70c973f8 Mon Sep 17 00:00:00 2001
From: Yigit Sever
Date: Wed, 1 Dec 2021 13:53:26 +0300
Subject: 2021, day1: done

---
 2021/day1/depth.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 2021/day1/depth.c

(limited to '2021/day1/depth.c')

diff --git a/2021/day1/depth.c b/2021/day1/depth.c
new file mode 100644
index 0000000..eff19b4
--- /dev/null
+++ b/2021/day1/depth.c
@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+int main(int argc, char *argv[])
+{
+	if (argc != 2) {
+		printf("Usage: ./depth <input-file>\n");
+		exit(EXIT_FAILURE);
+	}
+
+	FILE *fp;
+	char *buffer;
+	ssize_t read;
+	size_t len = 0;
+
+	fp = fopen(argv[1], "r");
+	if (fp == NULL) {
+		perror("fopen");
+		exit(EXIT_FAILURE);
+	}
+
+	int inc = 0;
+	int curr = 0;
+	uint8_t idx = 0;
+	int side = 0;
+	int depth[3] = { 0, 0, 0 };
+
+	read = getline(&buffer, &len, fp);
+	if (read != -1) {
+		depth[0] = atoi(buffer);
+	}
+
+	read = getline(&buffer, &len, fp);
+	if (read != -1) {
+		curr = atoi(buffer);
+		depth[0] += curr;
+		depth[1] = curr;
+	}
+
+	read = getline(&buffer, &len, fp);
+	if (read != -1) {
+		curr = atoi(buffer);
+		depth[0] += curr;
+		depth[1] += curr;
+		depth[2] = curr;
+	}
+
+	while ((read = getline(&buffer, &len, fp)) != -1) {
+		side = depth[idx];
+		depth[idx] = 0;
+		idx = (idx + 1) % 3;
+
+		curr = atoi(buffer);
+		depth[0] += curr;
+		depth[1] += curr;
+		depth[2] += curr;
+
+		if (depth[idx] > side) {
+			inc++;
+		}
+	}
+
+	fclose(fp);
+	if (buffer) {
+		free(buffer);
+	}
+
+	printf("%d", inc);
+
+	return 0;
+}
-- 
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