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2017
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Day 23 - off-by-one error >:[

This commit is contained in:
Jonathan Chan 2017-12-24 01:14:34 -08:00
parent dbd0b00676
commit adec393e53
2 changed files with 3 additions and 4 deletions
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3
23.hs
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@ -61,8 +61,7 @@ runInstructions instructions state@(State _ pos cnt) =
count :: Int count :: Int
count = count =
foldr (\b h -> h + (fromEnum . any id . map ((== 0) . (b `mod`)) $ [2..squareroot b])) 0 [108100, 108117..125083] foldr (\b h -> h + (fromEnum . or . map (\d -> b `mod` d == 0) $ [2..(floor . sqrt . fromIntegral) b])) 0 [108100, 108117..125100]
where squareroot = floor . sqrt . fromIntegral
main :: IO () main :: IO ()
main = do main = do

4
23b.c
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@ -13,14 +13,14 @@ unsigned int naiveCount() {
} }
} }
} }
h += !f h += !f;
} }
return h; return h;
} }
unsigned int count() { unsigned int count() {
unsigned short h = 0; unsigned short h = 0;
for (long b = 108100; b < 125100; b += 17) { for (long b = 108100; b <= 125100; b += 17) {
bool f = true; bool f = true;
for (unsigned short d = 2; f && d * d <= b; d++) { for (unsigned short d = 2; f && d * d <= b; d++) {
if (b % d == 0) { if (b % d == 0) {