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Fix problem by adding more lookback

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Bert Peters
2024-12-24 21:17:49 +01:00
parent e949ce9932
commit b41571949e
1 changed files with 21 additions and 2 deletions
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23
2024/src/aoc/days/day24.py
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@@ -84,6 +84,8 @@ class DayRunner(SeparateRunner):
return least_wrong return least_wrong
assert max_bit >= 3
# First one is a half adder, that's a simple pattern # First one is a half adder, that's a simple pattern
invalid = find_invalid("z00", ["XOR", "x00", "y00"]) invalid = find_invalid("z00", ["XOR", "x00", "y00"])
# Second one is missing a reference to the before-previous adder, so it's a # Second one is missing a reference to the before-previous adder, so it's a
@@ -91,8 +93,21 @@ class DayRunner(SeparateRunner):
invalid |= find_invalid( invalid |= find_invalid(
"z01", ["XOR", ["AND", "x00", "y00"], ["XOR", "x01", "y01"]] "z01", ["XOR", ["AND", "x00", "y00"], ["XOR", "x01", "y01"]]
) )
# Needed a second lookback to determine that `ktp` is valid
invalid |= find_invalid(
"z02",
[
"XOR",
["XOR", "x02", "y02"],
[
"OR",
["AND", "x01", "y01"],
["AND", ["XOR", "x01", "y01"], ["AND", "x00", "y00"]],
],
],
)
for n in range(2, max_bit): for n in range(3, max_bit):
xcurr = f"x{n:02}" xcurr = f"x{n:02}"
ycurr = f"y{n:02}" ycurr = f"y{n:02}"
zcurr = f"z{n:02}" zcurr = f"z{n:02}"
@@ -104,7 +119,11 @@ class DayRunner(SeparateRunner):
[ [
"XOR", "XOR",
["XOR", xcurr, ycurr], ["XOR", xcurr, ycurr],
["OR", ["AND", xprev, yprev], ["AND", ["XOR", xprev, yprev], None]], [
"OR",
["AND", xprev, yprev],
["AND", ["XOR", xprev, yprev], ["OR", None, None]],
],
], ],
) )