optimized the code and added a bunch of comment

please accept this pr pl0x pl0x pl0x pl0x pl0x pl0x

day1/day1.py

@@ -1,23 +1,32 @@
 if __name__ == "__main__":
-    elves = {}
+    # Initialize empty list to store sums
+    sums = []
 
+    # Open input file
     with open('input', 'r') as f:
-        elf = 0
-        elves[0] = 0
+        # Initialize sum for current group of numbers
+        current_sum = 0
+
+        # Read lines from file
         for line in f:
+            # If line is empty, append current sum to list and reset sum
             if line.strip() == '':
-                elf += 1
-                elves[elf] = 0
+                sums.append(current_sum)
+                current_sum = 0
             else:
-                elves[elf] += int(line.strip())
+                # Add number from line to current sum
+                current_sum += int(line.strip())
 
-    largest = max(elves, key=elves.get)
-    print(f'Index: {largest}\nValue: {elves[largest]}')
+        # Add last sum to list
+        sums.append(current_sum)
 
-    top3 = 0
-    for i in range(3):
-        largest = max(elves, key=elves.get)
-        top3 += elves[largest]
-        del elves[largest]
+    # Sort sums in descending order
+    sums.sort(reverse=True)
+
+    # Print index and value of largest group of numbers
+    print(f'Index: 0\nValue: {sums[0]}')
+
+    # Calculate sum of top 3 groups of numbers
+    top3_sum = sums[0] + sums[1] + sums[2]
+    print(f'Top 3: {top3_sum}')
 
-    print(f'Top 3: {top3}')