Day 6: Part 2

day6/main.py

@@ -1,7 +1,7 @@
+# ========== PART 1 ==========
 with open("day6/input.txt") as file:
     lines = file.readlines()
 
-
 lines = [line.strip("\n").split() for line in lines]
 for i in range(4):
     lines[i] = [int(number) for number in lines[i]]
@@ -18,7 +18,47 @@ for i in range(lineLen):
     else:
         print("ohoh ein Fehler")
 
-newGrandTotal = 0
+# ========== PART 2 ==========
-# Part 2
+with open("day6/input.txt") as file:
+    raw_lines = [line.rstrip('\n') for line in file.readlines()]
 
-print(f"Part 1: {grandTotal}\n\rPart 2: {newGrandTotal}")
+max_width = max(len(line) for line in raw_lines)
+grid = [list(line.ljust(max_width)) for line in raw_lines]
+
+num_rows = len(grid) - 1 # Number of rows with digits
+op_row = len(grid) - 1   # Index of the operator row
+max_cols = max_width
+
+
+newGrandTotal = 0
+current_numbers = [] # Stores numbers for the current problem (read R->L)
+
+for col in range(max_cols - 1, -1, -1):
+    number_digits = ""
+    for row in range(num_rows):
+        char = grid[row][col]
+        if char.isdigit():
+            number_digits += char
+    
+    operator = grid[op_row][col]
+
+    if operator == '+' or operator == '*':
+        if number_digits:
+            current_numbers.insert(0, int(number_digits)) # Prepend, as we are reading R->L
+        if not current_numbers:
+            continue 
+        result = current_numbers[0]
+        if operator == '*':
+            for num in current_numbers[1:]:
+                result *= num
+        elif operator == '+':
+            for num in current_numbers[1:]:
+                result += num             
+        newGrandTotal += result
+        current_numbers = []
+    
+    elif number_digits:
+        current_numbers.insert(0, int(number_digits))
+
+
+print(f"Part 1: {grandTotal}\nPart 2: {newGrandTotal}")