feat: Day2_1

2024/Day2/.clang-format

@@ -0,0 +1,6 @@
+BasedOnStyle: LLVM
+IndentWidth: 4
+ColumnLimit: 100
+PointerAlignment: Right
+AlignAfterOpenBracket: BlockIndent
+AlignArrayOfStructures: Left

2024/Day2/Makefile

@@ -0,0 +1,16 @@
+CC = gcc
+CC_FLAGS = -Wall -Wextra -Werror -Wpedantic -Wno-unused-parameter -Wno-unused-variable -Wno-unused-function
+CC_LINK_FLAGS =
+
+.PHONY: all run clean
+all: run
+
+run: build
+	./target/main.o
+
+build: src/main.c
+	$(CC) -o target/main.o src/main.c $(CC_FLAGS) $(CC_LINK_FLAGS)
+	chmod u+x target/main.o
+
+clean:
+	rm -r target/*

2024/Day2/src/main.c

@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFFER_SIZE 256
+
+int count_lines(char *filename);
+
+int main() {
+    FILE *file;
+    char filename[] = "input.txt";
+    char *buffer = malloc(BUFFER_SIZE);
+    char *saveptr;
+    char *current_number_string;
+    int count = 0;
+
+    file = fopen(filename, "r");
+
+    if (file == NULL) {
+        perror("Error opening file");
+        return 1;
+    }
+
+    while (fgets(buffer, BUFFER_SIZE, file) != NULL) {
+        char *line = buffer;
+        int previous_level = -1;
+        int is_decreasing = -1;
+        int is_last = 0;
+        while ((current_number_string = strtok_r(line, " ", &saveptr))) {
+            if (line) {
+                line = NULL;
+            }
+            if (current_number_string[strlen(current_number_string) - 1] == '\n') {
+                current_number_string[strlen(current_number_string) - 1] = '\0';
+                is_last = 1;
+            }
+            int level = atoi(current_number_string);
+            if (previous_level == -1) {
+                previous_level = level;
+                continue;
+            }
+
+            if (abs(level - previous_level) < 1 || abs(level - previous_level) > 3) {
+                break;
+            }
+
+            if (is_decreasing == -1) {
+                is_decreasing = (level < previous_level) ? 1 : 0;
+            }
+            if (is_decreasing && level < previous_level) {
+		previous_level = level;
+                if (is_last) {
+                    count++;
+                }
+            } else if (!is_decreasing && level > previous_level) {
+		previous_level = level;
+                if (is_last) {
+                    count++;
+                }
+            } else {
+                break;
+            }
+        }
+    }
+    printf("%d", count);
+
+    fclose(file);
+
+    return 0;
+}