day16 -- slow AF; revisit later

day16.py

@@ -0,0 +1,62 @@
+from tools.aoc import AOCDay
+from typing import Any
+
+
+DP = {}
+
+
+def dance(moves: list, sequence: list) -> list:
+    key = str(sequence)
+    if key in DP:
+        return DP[key].copy()
+    for move in moves:
+        if move.startswith("s"):
+            s = int(move[1:])
+            sequence = sequence[-s:] + sequence[:-s]
+        elif move.startswith("x"):
+            a, b = map(int, move[1:].split("/"))
+            sequence[a], sequence[b] = sequence[b], sequence[a]
+        elif move.startswith("p"):
+            a, b = map(ord, move[1:].split("/"))
+            a, b = sequence.index(a - 97), sequence.index(b - 97)
+            sequence[a], sequence[b] = sequence[b], sequence[a]
+        else:
+            print("Unknown Move:", move)
+
+    DP[key] = sequence.copy()
+    return sequence
+
+
+class Day(AOCDay):
+    inputs = [
+        [
+            ("paedcbfghijklmno", "input16_test"),
+            ("ehdpincaogkblmfj", "input16")
+        ],
+        [
+            ("bpcekomfgjdlinha", "input16")
+        ]
+    ]
+
+    def part1(self) -> Any:
+        global DP
+        DP = {}
+        moves = self.getInput().split(",")
+        init = dance(moves, list(range(16)))
+        return "".join([chr(x + 97) for x in init])
+
+    def part2(self) -> Any:
+        global DP
+        DP = {}
+        # part1 times 1_000_000_000???
+        # there must be a better way!
+        moves = self.getInput().split(",")
+        sequence = list(range(16))
+        for i in range(1_000_000_000):
+            sequence = dance(moves, sequence)
+        return "".join([chr(x + 97) for x in sequence])
+
+
+if __name__ == '__main__':
+    day = Day(2017, 16)
+    day.run(verbose=True)

inputs/input16_test

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+s1,x3/4,pe/b