From 12204b1a35de45a1388599afe5608ec3cc37af35 Mon Sep 17 00:00:00 2001 From: Alex Karle Date: Mon, 2 Dec 2024 15:09:23 +0100 Subject: [PATCH] 2024: Brute force day 2 solution --- 2024/02/1.py | 26 ++++++++++++++++++++++++++ 2024/02/2.py | 38 ++++++++++++++++++++++++++++++++++++++ 2024/02/input.txt | 1000 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2024/02/sample.txt | 6 ++++++ 4 files changed, 1070 insertions(+) create mode 100644 2024/02/1.py create mode 100644 2024/02/2.py create mode 100644 2024/02/input.txt create mode 100644 2024/02/sample.txt diff --git a/2024/02/1.py b/2024/02/1.py new file mode 100644 index 0000000..678ca84 --- /dev/null +++ b/2024/02/1.py @@ -0,0 +1,26 @@ +import sys + +total = 0 +for l in sys.stdin: + report = [int(x) for x in l.split()] + + delta = None + prev = None + safe = True + for n in report: + if prev: + d2 = n - prev + if not delta: + delta = d2 + if abs(d2) > 3 or d2 == 0: + safe = False + break + # check for same signage + if delta and delta * d2 < 0: + safe = False + break + prev = n + if safe: + total += 1 + +print(total) diff --git a/2024/02/2.py b/2024/02/2.py new file mode 100644 index 0000000..3fa3e47 --- /dev/null +++ b/2024/02/2.py @@ -0,0 +1,38 @@ +import sys + +def is_safe(report): + delta = None + prev = None + safe = True + for n in report: + if prev: + d2 = n - prev + if not delta: + delta = d2 + if abs(d2) > 3 or d2 == 0 or (delta and delta * d2 < 0): + safe = False + break + prev = n + return safe + +total = 0 +for l in sys.stdin: + report = [int(x) for x in l.split()] + + safe = is_safe(report) + if not safe: + # feels like there should be a faster method than brute forcing + # every combination? Escaping me right now. + # The catch is that in cases like 1 3 2 3 4, we want to drop + # the first 3, but it doesn't _look_ bad until we see the 2. + # When we see the bad 2, we would have to try to drop the 2 + for i in range(len(report)): + subrep = [report[j] for j in range(len(report)) if j != i] + safe = is_safe(subrep) + if safe: + break + + if safe: + total += 1 + +print(total) diff --git a/2024/02/input.txt b/2024/02/input.txt new file mode 100644 index 0000000..7370319 --- /dev/null +++ b/2024/02/input.txt @@ -0,0 +1,1000 @@ +9 12 14 16 17 18 15 +86 88 91 94 95 95 +15 18 20 21 23 25 28 32 +70 72 74 77 78 83 +57 60 62 64 63 64 65 +44 45 44 47 46 +33 35 32 33 36 36 +83 86 88 89 87 88 90 94 +56 59 62 65 68 65 68 75 +36 39 40 40 43 +87 90 93 95 95 97 94 +90 91 92 92 95 95 +11 14 14 15 16 19 23 +35 37 39 39 44 +59 61 63 67 68 69 +86 87 91 92 91 +33 36 38 39 43 44 47 47 +82 84 86 89 93 94 98 +4 5 7 10 13 17 24 +51 54 60 63 64 67 68 +38 40 43 45 51 54 56 53 +8 9 10 15 16 17 17 +24 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0000000..b49c10d --- /dev/null +++ b/2024/02/sample.txt @@ -0,0 +1,6 @@ +7 6 4 2 1 +1 2 7 8 9 +9 7 6 2 1 +1 3 2 4 5 +8 6 4 4 1 +1 3 6 7 9 -- libgit2 1.8.1