1 files changed, 53 insertions, 0 deletions
diff --git a/challenge-336/packy-anderson/python/ch-2.py b/challenge-336/packy-anderson/python/ch-2.py
new file mode 100755
index 0000000000..4d43d4745b
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+++ b/challenge-336/packy-anderson/python/ch-2.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+
+def final_score(scores):
+  stack = []
+  rounds = ""
+  count = 0
+  for action in scores:
+    if stack: previous = stack[-1]
+    match action:
+      case '+':
+        stack.append( stack[-1] + stack[-2] )
+      case 'C':
+        stack.pop()
+      case 'D':
+        stack.append( stack[-1] * 2 )
+      case _:
+        stack.append( int(action) )
+    count += 1
+    rounds += "Round {:2d}: ".format(count)
+    rounds += " + ".join([
+      f'({n})' if n < 0 else f'{n}' for n in stack
+    ])
+    if action == "+":
+      rounds += " (sum of previous two scores)"
+    if action == "D":
+      rounds += f" (double the previous score {previous})"
+    if action == "C":
+      rounds += f" (invalidate the previous score {previous})"
+    rounds += "\n"
+  total = sum(stack)
+  rounds += f"\nTotal Scores: {total}"
+  return (total, rounds)
+
+def solution(scores):
+  score_list = ', '.join([ f'"{s}"' for s in scores ])
+  print(f'Input: @scores = ({score_list})')
+  output, rounds = final_score(scores)
+  print(f'Output: {output}\n\n{rounds}')
+
+print('Example 1:')
+solution(["5","2","C","D","+"])
+
+print('\nExample 2:')
+solution(["5","-2","4","C","D","9","+","+"])
+
+print('\nExample 3:')
+solution(["7","D","D","C","+","3"])
+
+print('\nExample 4:')
+solution(["-5","-10","+","D","C","+"])
+
+print('\nExample 5:')
+solution(["3","6","+","D","C","8","+","D","-2","C","+"])