summertime warmup session with 2020 event

1 files changed, 33 insertions, 0 deletions

diff --git a/2020/aoc2020-d05.py b/2020/aoc2020-d05.py
new file mode 100644
index 0000000..ffc6ffb
--- /dev/null
+++ b/2020/aoc2020-d05.py
@@ -0,0 +1,33 @@
+#advent of code 2020
+#day 05
+#examples = ["BFFFBBFRRR","FFFBBBFRRR","BBFFBBFRLL"];
+def partitioner(instr, limLow, limHigh, splitLow, splitHigh):
+	diff = limHigh - limLow + 1;
+	if instr == "":
+		return limLow;
+	elif instr[0] == splitLow:
+		return partitioner(instr[1:], limLow, limHigh-diff//2, splitLow, splitHigh);
+	elif instr[0] == splitHigh:
+		return partitioner(instr[1:], limLow+diff//2, limHigh, splitLow, splitHigh);
+
+p1 = 0;
+AllSeats = [];
+PuzzleInput = open("05.in","r");
+
+for BoardingPass in PuzzleInput:
+	BP = BoardingPass.replace("\n","");
+	row = partitioner(BP[:-3],0,127,"F","B");
+	col = partitioner(BP[-3:],0,7,"L","R");
+	seatID = row*8 + col;
+	p1 = max(p1,seatID)
+	AllSeats.append(seatID)
+PuzzleInput.close();
+
+AllSeats = sorted(AllSeats);
+for n in range(1, len(AllSeats)):
+	if AllSeats[n] - AllSeats[n-1] != 1:
+		p2 = AllSeats[n-1] + 1;
+		break;
+
+print("part 1 = ",p1);
+print("part 2 = ",p2);