Day 22

2019/day22.py

@@ -0,0 +1,37 @@
+EX1 = [
+    "cut 6",
+    "deal with increment 7",
+    "deal into new stack",
+]
+
+
+def main():
+    with open("day22.txt") as input_file:
+        lines = [l.rstrip() for l in input_file.readlines()]
+
+    deck = list(range(10007))
+    for line in lines:
+        # Deal into new stack.
+        if line.endswith("k"):
+            deck.reverse()
+            continue
+
+        arg = int(line[line.rfind(" "):])
+
+        # Deal with increment.
+        if line[0] == "d":
+            new_deck = [None] * len(deck)
+            for i in range(len(deck)):
+                new_deck[(i * arg) % len(new_deck)] = deck[i]
+            deck = new_deck
+
+        # Cut.
+        elif line[0] == "c":
+            cut, deck = deck[:arg], deck[arg:]
+            deck += cut
+
+    print(f"Position of card 2019: {deck.index(2019)}.")
+
+
+if __name__ == "__main__":
+    main()