From 50efc984f96c196053927ae7b3d05ce0d37f5f92 Mon Sep 17 00:00:00 2001
From: Peter <peterr.00000@gmail.com>
Date: Thu, 2 Dec 2021 18:54:41 +0800
Subject: [PATCH] Day 2 solutions

---
 2/2-1.c | 32 ++++++++++++++++++++++++++++++++
 2/2-2.c | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 2/2-1.c
 create mode 100644 2/2-2.c

diff --git a/2/2-1.c b/2/2-1.c
new file mode 100644
index 0000000..7223296
--- /dev/null
+++ b/2/2-1.c
@@ -0,0 +1,32 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char const *argv[])
+{
+    FILE *p_file = fopen("input", "r");
+    char instruction[50];
+
+    int horizontal, depth = 0;
+
+    while (fgets(instruction, sizeof instruction, p_file) != NULL)
+    {
+        char direction[50];
+        int *amount = malloc(sizeof(int));
+        if (sscanf(instruction, "%s %i", direction, amount) != 2)
+            exit(EXIT_FAILURE);
+        if (strcmp(direction, "up") == 0)
+            (*amount) *= -1;
+        if (strcmp(direction, "forward") == 0)
+        {
+            horizontal += *amount;
+        }
+        else
+        {
+            depth += *amount;
+        }
+        // printf("POSITION horizontal %d, depth %d\n", horizontal, depth);
+    }
+    printf("%d\n", depth * horizontal);
+    return 0;
+}
diff --git a/2/2-2.c b/2/2-2.c
new file mode 100644
index 0000000..45bde73
--- /dev/null
+++ b/2/2-2.c
@@ -0,0 +1,36 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char const *argv[])
+{
+    FILE *p_file = fopen("input", "r");
+    char instruction[50];
+
+    int horizontal, depth, aim = 0;
+
+    while (fgets(instruction, sizeof instruction, p_file) != NULL)
+    {
+        char direction[50];
+        int *amount = malloc(sizeof(int));
+        if (sscanf(instruction, "%s %i", direction, amount) != 2)
+            exit(EXIT_FAILURE);
+        if (strcmp(direction, "up") == 0)
+        {
+            aim -= *amount;
+        }
+        else if (strcmp(direction, "down") == 0)
+        {
+            aim += *amount;
+        }
+        else // FORWARD
+        {
+            horizontal += *amount;
+            depth += (*amount) * aim;
+        }
+        // printf("POSITION horizontal %d\t depth %d\t aim %d\n",
+        //        horizontal, depth, aim);
+    }
+    printf("%d\n", depth * horizontal);
+    return 0;
+}