Adding day 5 and 6

5 files changed, 3054 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bee8a64
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diff --git a/day5/input b/day5/input
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diff --git a/day5/main.py b/day5/main.py
new file mode 100644
index 0000000..b544b61
--- /dev/null
+++ b/day5/main.py
@@ -0,0 +1,18 @@
+"""Peter Norvig solution. Forgot to do day 5."""
+data = map(str.strip, open("input"))
+
+ID = int
+
+def seat_id(seat: str, table=str.maketrans('FLBR', '0011')) -> ID:
+    "Treat a seat description as a binary number; convert to int."
+    return ID(seat.translate(table), base=2)
+
+
+ids = [seat_id(x) for x in data]
+
+# Part 1
+print(max(ids))
+
+# Part 2
+[missing] = set(range(min(ids), max(ids))) - set(ids)
+print(missing)
diff --git a/day6/input b/day6/input
new file mode 100644
index 0000000..b47104b
--- /dev/null
+++ b/day6/input
@@ -0,0 +1,2165 @@
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diff --git a/day6/main.py b/day6/main.py
new file mode 100644
index 0000000..7bad5d2
--- /dev/null
+++ b/day6/main.py
@@ -0,0 +1,24 @@
+"""Day 6."""
+from collections import Counter
+
+
+def score_part1(group):
+    """Determine score for group in part 1."""
+    return len(set(group.replace("\n", "")))
+
+
+def score_part2(group):
+    """Determine score for group in part 2."""
+    group_size = group.count("\n") + 1
+    counter = Counter(group.replace("\n", ""))
+    return sum(1 for _, occurences in counter.items() if occurences == group_size)
+
+
+with open("input") as f:
+    groups = f.read().rstrip().split("\n\n")
+
+# Part 1
+print(sum(map(score_part1, groups)))
+
+# Part 2
+print(sum(map(score_part2, groups)))