init day 2

.vscode/launch.json

@@ -6,7 +6,7 @@
             "request": "launch",
             "name": "Launch",
             "program": "${workspaceFolder}/build/adventofcode/adventofcode",
-            "args": ["2024", "1", "2"],
+            "args": ["2024", "2", "1"],
             "cwd": "${workspaceFolder}",
             "preLaunchTask": "CMake: build",
         }

2024/CMakeLists.txt

@@ -1,6 +1,6 @@
 add_library(2024 SHARED)
 
-foreach(i RANGE 1 1)
+foreach(i RANGE 1 2)
     set(out_path "${CMAKE_CURRENT_SOURCE_DIR}/src/include/day${i}_input.h")
     add_custom_command(
         OUTPUT "${CMAKE_CURRENT_SOURCE_DIR}/src/include/day${i}_input.h"
@@ -17,4 +17,5 @@ target_link_libraries(2024 m)
 target_sources(2024
     PRIVATE 
     src/day1.c
+    src/day2.c
 )

2024/src/day1.c

@@ -1,4 +1,4 @@
-#include "include/days.h"
+#include "include/day1_input.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <inttypes.h>
@@ -12,7 +12,7 @@ struct list_pair {
     struct list_ctx *right;
 };
 
-struct list_pair *parse_input() {
+struct list_pair *parse_input_day1() {
     struct list_pair *ctx = malloc(sizeof(struct list_pair));
     ctx->left = malloc(sizeof(struct list_ctx));
     ctx->left->list = malloc(1000 * sizeof(u_int32_t));
@@ -31,6 +31,7 @@ struct list_pair *parse_input() {
                 if (list_buf_len) {
                     ctx->left->list[list_i] = strtoul(list_buf, NULL, 10);
                     list_buf_len = 0;
+                    free(list_buf);
                     list_buf = NULL;
                 };
                 break;
@@ -38,6 +39,7 @@ struct list_pair *parse_input() {
                 ctx->right->list[list_i] = strtoul(list_buf, NULL, 10);
                 list_i++;
                 list_buf_len = 0;
+                free(list_buf);
                 list_buf = NULL;
                 break;
             }
@@ -68,7 +70,7 @@ void selection_sort(struct list_ctx *ctx) {
 } 
 
 char *day_1_part_1() {
-    struct list_pair *pair = parse_input();
+    struct list_pair *pair = parse_input_day1();
 
     selection_sort(pair->left);
     selection_sort(pair->right);
@@ -91,7 +93,7 @@ char *day_1_part_1() {
 }
 
 char *day_1_part_2() {
-    struct list_pair *pair = parse_input();
+    struct list_pair *pair = parse_input_day1();
     int total = 0;
 
     // TODO: do not the O(n^2)

2024/src/day2.c

@@ -0,0 +1,84 @@
+#include "include/day2_input.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/types.h>
+
+struct list_ctx {
+    void** list;
+    size_t list_len;
+};
+
+
+struct list_ctx *parse_input_day2() {
+    struct list_ctx *ctx = malloc(sizeof(struct list_ctx));
+    ctx->list = malloc(1000 * sizeof(struct list_ctx));
+    ctx->list_len = 1000;
+
+    int list_i = 0;
+    int report_buf_len = 0;
+    int report_i = 0;
+    char *report_buf = NULL; 
+    ctx->list[list_i] = malloc(sizeof(struct list_ctx));
+    ctx->list_len = 0;
+    for(int i = 0; i < input_day2_txt_len; i++) {
+        char c = input_day2_txt[i];
+        struct list_ctx *report = ((struct list_ctx*) ctx->list[list_i]);
+        switch(c) {
+            case ' ': 
+                if (report_buf_len) {
+                    report->list = realloc(report->list, sizeof(u_int8_t) * (report_i+1));            
+                    report->list[report_i] = malloc(sizeof(u_int8_t));
+                    *(u_int8_t*) report->list[report_i] = strtoul(report_buf, NULL, 10);
+                    report_buf_len = 0;
+                    free(report_buf);
+                    report_buf = NULL;
+                    report_i++;
+                    fprintf(stderr, "%lu", strtoul(report_buf, NULL, 10));
+                };
+                break;
+            case '\n': { 
+                    report->list = realloc(report->list, sizeof(u_int8_t) * (report_i+1));            
+                    report->list[report_i] = malloc(sizeof(u_int8_t));
+                    *(u_int8_t*) report->list[report_i] = strtoul(report_buf, NULL, 10);
+                    list_i++;
+                    report_buf_len = 0;
+                    free(report_buf);
+                    report_buf = NULL;
+                    fprintf(stderr, "%lu\n", strtoul(report_buf, NULL, 10));
+                    report_i = 0;
+                break;
+            }
+            default: {
+                report_buf = realloc(report_buf, (report_buf_len++) * sizeof(char));
+                report_buf[report_buf_len-1] = c;
+            }
+        }
+    }
+    return ctx;
+}
+
+
+
+char* day_2_part_1() {
+    struct list_ctx *ctx = parse_input_day2();
+    int total = 0;
+
+    for(int list_i = 0; list_i < ctx->list_len; list_i++) {
+        struct list_ctx *report = ((struct list_ctx*) ctx->list[list_i]);
+        bool safe = true;
+        for(int report_i = 1; report_i < report->list_len && safe; report_i++) {
+            int diff = *(u_int8_t*) report->list[report_i] - *(u_int8_t *) report->list[report_i];
+            safe = diff < 3 && diff > -3;
+        }
+        total += safe;
+    }
+
+    int len = snprintf(NULL, 0, "%d", total) + 1;
+    char *total_str = malloc(len);
+    snprintf(total_str, len, "%d", total); 
+        
+    return total_str;
+}

2024/src/include/days.h

@@ -1,3 +0,0 @@
-#include "day1_input.h"
-
-char *day_1_part_1(void);