day 3

1/README.md

@@ -1,8 +1,9 @@
-# [Day 1](https://adventofcode.com/2022/day/1) :gift:
+# [Day 1](https://adventofcode.com/2022/day/1) 
+:gift:
+Today's language: **awk** + **GNU-coretils**
 ```shell
 # Find the Elf carrying the most Calories. How many total Calories is that Elf carrying?
 awk -f day1-1.awk input.txt
 # Find the top three Elves carrying the most Calories. How many Calories are those Elves carrying in total?
 ./day1.2.sh
 ```
-

2/README.md

@@ -1,5 +1,6 @@
-# [Day 2](https://adventofcode.com/2022/day/2) :gift::gift:
+# [Day 2](https://adventofcode.com/2022/day/2)
-
+:gift::gift:
+Today's language: **C++**
 ```shell
 # What would your total score be if everything goes exactly according to your strategy guide?
 g++ main.cpp -o day2

3/.gitignore

@@ -0,0 +1,2 @@
+day3
+.clangd

3/README.md

@@ -0,0 +1,8 @@
+# [Day 3](https://adventofcode.com/2022/day/3) 
+:gift::gift::gift:
+Today's language: **C**
+```shell
+# Find the item type that appears in both compartments of each rucksack. What is the sum of the priorities of those item types?
+gcc main.c -o day3
+./day3
+```

3/main.c

@@ -0,0 +1,92 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#define char_bits long unsigned int
+
+int convert_char_to_priority(char c) {
+    if (c >= 'a') { 
+        return (int) c + 1 - 'a';
+    }
+    else {
+        return (int) c + 27 - 'A';
+    }
+}
+
+int find_set_bit(const char_bits* bits) {
+    for (int bit = 0; bit < 64; bit++) {
+        if (*bits & (1ul << bit)) {
+            return bit;
+        }
+    }
+    return -1;
+}
+
+int main() {
+    FILE* p_file;
+    p_file = fopen("rucksack_items.txt", "r");
+    if (p_file == NULL) {
+        printf("Could not open file");
+        exit(1);
+    }
+    int lineCount = 0;
+    char* p_linebuffer = NULL;
+    size_t linebufferLength = 0;
+    ssize_t lineLength = getline(&p_linebuffer, &linebufferLength, p_file);
+    int priorities =  0;
+    int groupPriorities = 0;
+    char_bits bitsLine1, bitsLine2, bitsLine3 = 0; // each bit is one char(item), where a is 1, A is 27
+
+    while (lineLength > 0) {
+        char_bits currentBitsHalf1 = 0;
+        char_bits currentBitsHalf2 = 0;
+        assert(lineLength % 2 == 1);  // even backpacks + null
+        lineCount++;
+        int backpackLength = (lineLength - 1) / 2;
+
+        char_bits* lineBits = NULL;
+        switch(lineCount % 3) {
+            case 1: lineBits = &bitsLine1; break;
+            case 2: lineBits = &bitsLine2; break;
+            case 0: lineBits = &bitsLine3; break;
+            default: printf("Error in switch-case"); exit(1); 
+        }
+        // set all the bits for the correct bitsLine
+        for (int i = 0; i < backpackLength; i++) {  // first half
+            int prioritiy = convert_char_to_priority(p_linebuffer[i]);
+            currentBitsHalf1 |= (1ul << prioritiy);  // set bit of the item
+        }
+        for (int i = backpackLength; i < 2*backpackLength; i++) {  // second half
+            int prioritiy = convert_char_to_priority(p_linebuffer[i]);
+            currentBitsHalf2 |= (1ul << prioritiy);
+        }
+
+        *lineBits |= currentBitsHalf1 | currentBitsHalf2;
+        currentBitsHalf1 &= currentBitsHalf2;
+        int priority = find_set_bit(&currentBitsHalf1);
+        if (priority < 0) {
+            printf("Error in line [%06d]: Could not find duplicate character. Backpack length: [%06d], line content: '%s'\n", lineCount, backpackLength, p_linebuffer);
+            exit(1);
+        }
+        priorities += priority;
+        if (lineCount % 3 == 0) {
+            bitsLine1 &= bitsLine2 & bitsLine3;
+            priority = find_set_bit(&bitsLine1);
+            if (priority < 0) {
+                printf("Error in group [%06d]: Could not find group badge item type.", lineCount / 3);
+                exit(1);
+            }
+            groupPriorities += priority;
+            bitsLine1 = 0; bitsLine2 = 0; bitsLine3 = 0;
+        }
+        /* printf("line[%06d]: lineSize:[%06zd], priorities:[%06d], groupPriorities:[%06d], content: %s", lineCount, lineLength, priorities, groupPriorities, p_linebuffer); */
+        lineLength = getline(&p_linebuffer, &linebufferLength, p_file);
+    }
+    free(p_linebuffer);
+    p_linebuffer = NULL;
+    fclose(p_file);
+
+    printf("The sum of priorities of the duplicate items is: %06d\n", priorities);
+    printf("The sum of priorities of the group badges is: %06d\n", groupPriorities);
+    return 0;
+}

3/rucksack_items.txt

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