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7 Commits

Author SHA1 Message Date
acb6c3feb2 haskell: wtf p7
Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
2022-11-08 18:15:14 +05:30
142a2ea8aa haskell: add p18 and p67
Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
2022-11-08 18:06:06 +05:30
de6ea02b14 haskell: add [p12, p17]
Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
2022-11-07 19:17:35 +05:30
22fdf20500 haskell: add p11
Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
2022-11-07 16:02:17 +05:30
ad0acc15c9 haskell: add [p4, p10]
Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
2022-10-27 08:54:11 +05:30
e3f9ab49f3 haskell: add p3
Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
2022-10-27 04:21:00 +05:30
4e98bf2115 rust: add p1, p2
Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
2022-10-27 04:16:43 +05:30
23 changed files with 497 additions and 5 deletions

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@@ -1,4 +1,39 @@
module Lib where
module Lib
( factors,
fib,
primes,
primeFactors,
sumOfDigits,
)
where
fib :: [ Integer ]
import Data.List (nub)
factors :: Integral a => a -> [a]
factors n = concat [if mod n f == 0 then nub [f, div n f] else [] | f <- [1 .. flsqrt n]]
fib :: [Integer]
fib = 1 : 2 : zipWith (+) fib (tail fib)
flsqrt :: Integral a => a -> a
flsqrt n = floor $ sqrt $ fromIntegral n
isPrime :: Integral a => a -> Bool
isPrime n = n > 1 && null [[] | k <- [2 .. flsqrt n], mod n k == 0]
primes :: [Integer]
primes = 2 : filter isPrime [3, 4 ..]
primeFactors :: Integral a => a -> [a]
primeFactors n = genPrimeFactors n 2
where
genPrimeFactors :: Integral a => a -> a -> [a]
genPrimeFactors n c
| c * c > n = [n]
| mod n c /= 0 = genPrimeFactors n (c + 1)
| otherwise = c : genPrimeFactors (div n c) c
sumOfDigits :: Integral a => a -> a
sumOfDigits n
| n == 0 = 0
| otherwise = mod n 10 + sumOfDigits (div n 10)

7
haskell/p10.hs Normal file
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@@ -0,0 +1,7 @@
import Lib (primes)
main :: IO ()
main = putStr $ show solve
solve :: Integer
solve = sum $ takeWhile (< 2000000) primes

57
haskell/p11.hs Normal file
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@@ -0,0 +1,57 @@
main :: IO ()
main = putStr $ show $ solve rawData 4
solve :: [[Int]] -> Int -> Int
solve raw n =
maximum $
concat
[ products 1 0,
products 0 1,
products 1 1,
products (-1) 1
]
where
products :: Int -> Int -> [Int]
products dirX dirY =
[ product z
| y <- [0 .. lenY - 1],
x <- [0 .. lenX y - 1],
let z =
[ raw !! y' !! x'
| z <- [0 .. n - 1],
let x' = x + dirX * z,
let y' = y + dirY * z,
checkBounds x' y'
],
length z == n
]
checkBounds :: Int -> Int -> Bool
checkBounds x y = y >= 0 && y < lenY && x >= 0 && x < lenX y
lenY :: Int
lenY = length raw
lenX :: Int -> Int
lenX y = length $ raw !! y
rawData :: [[Int]]
rawData =
[ [08, 02, 22, 97, 38, 15, 00, 40, 00, 75, 04, 05, 07, 78, 52, 12, 50, 77, 91, 08],
[49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 04, 56, 62, 00],
[81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 03, 49, 13, 36, 65],
[52, 70, 95, 23, 04, 60, 11, 42, 69, 24, 68, 56, 01, 32, 56, 71, 37, 02, 36, 91],
[22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80],
[24, 47, 32, 60, 99, 03, 45, 02, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50],
[32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70],
[67, 26, 20, 68, 02, 62, 12, 20, 95, 63, 94, 39, 63, 08, 40, 91, 66, 49, 94, 21],
[24, 55, 58, 05, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72],
[21, 36, 23, 09, 75, 00, 76, 44, 20, 45, 35, 14, 00, 61, 33, 97, 34, 31, 33, 95],
[78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 03, 80, 04, 62, 16, 14, 09, 53, 56, 92],
[16, 39, 05, 42, 96, 35, 31, 47, 55, 58, 88, 24, 00, 17, 54, 24, 36, 29, 85, 57],
[86, 56, 00, 48, 35, 71, 89, 07, 05, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58],
[19, 80, 81, 68, 05, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 04, 89, 55, 40],
[04, 52, 08, 83, 97, 35, 99, 16, 07, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66],
[88, 36, 68, 87, 57, 62, 20, 72, 03, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69],
[04, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 08, 46, 29, 32, 40, 62, 76, 36],
[20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 04, 36, 16],
[20, 73, 35, 29, 78, 31, 90, 01, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 05, 54],
[01, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 01, 89, 19, 67, 48]
]

10
haskell/p12.hs Normal file
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@@ -0,0 +1,10 @@
import Lib (factors)
main :: IO ()
main = putStr $ show $ solve 500
solve :: Int -> Integer
solve n = head [tn | i <- [1 ..], let tn = triangleNumber i, (length . factors) tn > n]
triangleNumber :: Int -> Integer
triangleNumber n = toInteger $ div (n * (n + 1)) 2

106
haskell/p13.hs Normal file
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@@ -0,0 +1,106 @@
main :: IO ()
main = putStr $ take 10 $ show $ sum nums
nums :: [Integer]
nums =
[ 37107287533902102798797998220837590246510135740250,
46376937677490009712648124896970078050417018260538,
74324986199524741059474233309513058123726617309629,
91942213363574161572522430563301811072406154908250,
23067588207539346171171980310421047513778063246676,
89261670696623633820136378418383684178734361726757,
28112879812849979408065481931592621691275889832738,
44274228917432520321923589422876796487670272189318,
47451445736001306439091167216856844588711603153276,
70386486105843025439939619828917593665686757934951,
62176457141856560629502157223196586755079324193331,
64906352462741904929101432445813822663347944758178,
92575867718337217661963751590579239728245598838407,
58203565325359399008402633568948830189458628227828,
80181199384826282014278194139940567587151170094390,
35398664372827112653829987240784473053190104293586,
86515506006295864861532075273371959191420517255829,
71693888707715466499115593487603532921714970056938,
54370070576826684624621495650076471787294438377604,
53282654108756828443191190634694037855217779295145,
36123272525000296071075082563815656710885258350721,
45876576172410976447339110607218265236877223636045,
17423706905851860660448207621209813287860733969412,
81142660418086830619328460811191061556940512689692,
51934325451728388641918047049293215058642563049483,
62467221648435076201727918039944693004732956340691,
15732444386908125794514089057706229429197107928209,
55037687525678773091862540744969844508330393682126,
18336384825330154686196124348767681297534375946515,
80386287592878490201521685554828717201219257766954,
78182833757993103614740356856449095527097864797581,
16726320100436897842553539920931837441497806860984,
48403098129077791799088218795327364475675590848030,
87086987551392711854517078544161852424320693150332,
59959406895756536782107074926966537676326235447210,
69793950679652694742597709739166693763042633987085,
41052684708299085211399427365734116182760315001271,
65378607361501080857009149939512557028198746004375,
35829035317434717326932123578154982629742552737307,
94953759765105305946966067683156574377167401875275,
88902802571733229619176668713819931811048770190271,
25267680276078003013678680992525463401061632866526,
36270218540497705585629946580636237993140746255962,
24074486908231174977792365466257246923322810917141,
91430288197103288597806669760892938638285025333403,
34413065578016127815921815005561868836468420090470,
23053081172816430487623791969842487255036638784583,
11487696932154902810424020138335124462181441773470,
63783299490636259666498587618221225225512486764533,
67720186971698544312419572409913959008952310058822,
95548255300263520781532296796249481641953868218774,
76085327132285723110424803456124867697064507995236,
37774242535411291684276865538926205024910326572967,
23701913275725675285653248258265463092207058596522,
29798860272258331913126375147341994889534765745501,
18495701454879288984856827726077713721403798879715,
38298203783031473527721580348144513491373226651381,
34829543829199918180278916522431027392251122869539,
40957953066405232632538044100059654939159879593635,
29746152185502371307642255121183693803580388584903,
41698116222072977186158236678424689157993532961922,
62467957194401269043877107275048102390895523597457,
23189706772547915061505504953922979530901129967519,
86188088225875314529584099251203829009407770775672,
11306739708304724483816533873502340845647058077308,
82959174767140363198008187129011875491310547126581,
97623331044818386269515456334926366572897563400500,
42846280183517070527831839425882145521227251250327,
55121603546981200581762165212827652751691296897789,
32238195734329339946437501907836945765883352399886,
75506164965184775180738168837861091527357929701337,
62177842752192623401942399639168044983993173312731,
32924185707147349566916674687634660915035914677504,
99518671430235219628894890102423325116913619626622,
73267460800591547471830798392868535206946944540724,
76841822524674417161514036427982273348055556214818,
97142617910342598647204516893989422179826088076852,
87783646182799346313767754307809363333018982642090,
10848802521674670883215120185883543223812876952786,
71329612474782464538636993009049310363619763878039,
62184073572399794223406235393808339651327408011116,
66627891981488087797941876876144230030984490851411,
60661826293682836764744779239180335110989069790714,
85786944089552990653640447425576083659976645795096,
66024396409905389607120198219976047599490197230297,
64913982680032973156037120041377903785566085089252,
16730939319872750275468906903707539413042652315011,
94809377245048795150954100921645863754710598436791,
78639167021187492431995700641917969777599028300699,
15368713711936614952811305876380278410754449733078,
40789923115535562561142322423255033685442488917353,
44889911501440648020369068063960672322193204149535,
41503128880339536053299340368006977710650566631954,
81234880673210146739058568557934581403627822703280,
82616570773948327592232845941706525094512325230608,
22918802058777319719839450180888072429661980811197,
77158542502016545090413245809786882778948721859617,
72107838435069186155435662884062257473692284509516,
20849603980134001723930671666823555245252804609722,
53503534226472524250874054075591789781264330331690
]

15
haskell/p14.hs Normal file
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@@ -0,0 +1,15 @@
import Data.Ord (comparing)
import Data.List (maximumBy)
main :: IO ()
main = putStr $ show $ fst $ maximumBy (comparing snd) $ zip range $ map collatz range
where
range :: [ Int ]
range = [1 .. 10 ^ 6 - 1]
-- eh 12s isn't much
collatz :: Int -> Int
collatz n
| n == 1 = 1
| even n = 1 + collatz (div n 2)
| otherwise = 1 + collatz (3 * n + 1)

3
haskell/p15.hs Normal file
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@@ -0,0 +1,3 @@
-- formula based approach i.e, 40C20
main :: IO ()
main = putStr $ show $ div (product [21..40]) (product [1..20])

4
haskell/p16.hs Normal file
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@@ -0,0 +1,4 @@
import Lib (sumOfDigits)
main :: IO ()
main = putStr $ show $ sumOfDigits (2^1000 :: Integer)

22
haskell/p17.hs Normal file
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@@ -0,0 +1,22 @@
--The answer is written for numbers <= 1000
main :: IO ()
main = putStr $ show $ solve 1000
solve :: Int -> Int
solve n = sum $ map (length . numWord) [1 .. n]
numWord :: Int -> [Char]
numWord n
| n == 0 = ""
| n == 1000 = "onethousand"
| n < 20 = ones !! (n - 1)
| n < 100 = tens !! (div n 10 - 2) ++ numWord (mod n 10)
| mod n 100 == 0 = numWord (div n 100) ++ "hundred"
| otherwise = numWord (div n 100) ++ "hundredand" ++ numWord (mod n 100)
where
tens :: [[Char]]
tens = ["twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
ones :: [[Char]]
ones = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]

24
haskell/p18.hs Normal file
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@@ -0,0 +1,24 @@
main :: IO ()
main = putStr $ show $ solve $ reverse rawData
solve :: [[Integer]] -> Integer
solve (r: raw) = head $ foldl (\x y -> [y !! i + max (x !! i) (x !! (i + 1)) | i <- [0 .. length x - 1]]) r raw
rawData :: [[Integer]]
rawData =
[ [75],
[95, 64],
[17, 47, 82],
[18, 35, 87, 10],
[20, 04, 82, 47, 65],
[19, 01, 23, 75, 03, 34],
[88, 02, 77, 73, 07, 63, 67],
[99, 65, 04, 28, 06, 16, 70, 92],
[41, 41, 26, 56, 83, 40, 80, 70, 33],
[41, 48, 72, 33, 47, 32, 37, 16, 94, 29],
[53, 71, 44, 65, 25, 43, 91, 52, 97, 51, 14],
[70, 11, 33, 28, 77, 73, 17, 78, 39, 68, 17, 57],
[91, 71, 52, 38, 17, 14, 91, 43, 58, 50, 27, 29, 48],
[63, 66, 04, 68, 89, 53, 67, 30, 73, 16, 69, 87, 40, 31],
[04, 62, 98, 27, 23, 09, 70, 98, 73, 93, 38, 53, 60, 04, 23]
]

7
haskell/p3.hs Normal file
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@@ -0,0 +1,7 @@
import Lib (primeFactors)
main :: IO ()
main = putStr $ show solve
solve :: Integer
solve = last $ primeFactors 600851475143

5
haskell/p4.hs Normal file
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@@ -0,0 +1,5 @@
main :: IO ()
main = putStr $ show solve
solve :: Integer
solve = maximum [a * b | a <- [100 .. 999], b <- [a .. 999], let s = show $ a * b, s == reverse s]

5
haskell/p5.hs Normal file
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@@ -0,0 +1,5 @@
main :: IO ()
main = putStr $ show solve
solve :: Integer
solve = foldl1 lcm [1 .. 20]

11
haskell/p6.hs Normal file
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@@ -0,0 +1,11 @@
main :: IO ()
main = putStr $ show $ solve 100
solve :: Integer -> Integer
solve n = squareOfSum n - sumOfSquares n
where
squareOfSum :: Integer -> Integer
squareOfSum n = sum [1 .. n] ^ 2
sumOfSquares :: Integer -> Integer
sumOfSquares n = sum $ map (^ 2) [1 .. n]

109
haskell/p67.hs Normal file
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@@ -0,0 +1,109 @@
main :: IO ()
main = putStr $ show $ solve $ reverse rawData
solve :: [[Integer]] -> Integer
solve (r : raw) = head $ foldl (\x y -> [y !! i + max (x !! i) (x !! (i + 1)) | i <- [0 .. length x - 1]]) r raw
rawData :: [[Integer]]
rawData =
[ [59],
[73, 41],
[52, 40, 09],
[26, 53, 06, 34],
[10, 51, 87, 86, 81],
[61, 95, 66, 57, 25, 68],
[90, 81, 80, 38, 92, 67, 73],
[30, 28, 51, 76, 81, 18, 75, 44],
[84, 14, 95, 87, 62, 81, 17, 78, 58],
[21, 46, 71, 58, 02, 79, 62, 39, 31, 09],
[56, 34, 35, 53, 78, 31, 81, 18, 90, 93, 15],
[78, 53, 04, 21, 84, 93, 32, 13, 97, 11, 37, 51],
[45, 03, 81, 79, 05, 18, 78, 86, 13, 30, 63, 99, 95],
[39, 87, 96, 28, 03, 38, 42, 17, 82, 87, 58, 07, 22, 57],
[06, 17, 51, 17, 07, 93, 09, 07, 75, 97, 95, 78, 87, 08, 53],
[67, 66, 59, 60, 88, 99, 94, 65, 55, 77, 55, 34, 27, 53, 78, 28],
[76, 40, 41, 04, 87, 16, 09, 42, 75, 69, 23, 97, 30, 60, 10, 79, 87],
[12, 10, 44, 26, 21, 36, 32, 84, 98, 60, 13, 12, 36, 16, 63, 31, 91, 35],
[70, 39, 06, 05, 55, 27, 38, 48, 28, 22, 34, 35, 62, 62, 15, 14, 94, 89, 86],
[66, 56, 68, 84, 96, 21, 34, 34, 34, 81, 62, 40, 65, 54, 62, 05, 98, 03, 02, 60],
[38, 89, 46, 37, 99, 54, 34, 53, 36, 14, 70, 26, 02, 90, 45, 13, 31, 61, 83, 73, 47],
[36, 10, 63, 96, 60, 49, 41, 05, 37, 42, 14, 58, 84, 93, 96, 17, 09, 43, 05, 43, 06, 59],
[66, 57, 87, 57, 61, 28, 37, 51, 84, 73, 79, 15, 39, 95, 88, 87, 43, 39, 11, 86, 77, 74, 18],
[54, 42, 05, 79, 30, 49, 99, 73, 46, 37, 50, 02, 45, 09, 54, 52, 27, 95, 27, 65, 19, 45, 26, 45],
[71, 39, 17, 78, 76, 29, 52, 90, 18, 99, 78, 19, 35, 62, 71, 19, 23, 65, 93, 85, 49, 33, 75, 09, 02],
[33, 24, 47, 61, 60, 55, 32, 88, 57, 55, 91, 54, 46, 57, 07, 77, 98, 52, 80, 99, 24, 25, 46, 78, 79, 05],
[92, 09, 13, 55, 10, 67, 26, 78, 76, 82, 63, 49, 51, 31, 24, 68, 05, 57, 07, 54, 69, 21, 67, 43, 17, 63, 12],
[24, 59, 06, 08, 98, 74, 66, 26, 61, 60, 13, 03, 09, 09, 24, 30, 71, 08, 88, 70, 72, 70, 29, 90, 11, 82, 41, 34],
[66, 82, 67, 04, 36, 60, 92, 77, 91, 85, 62, 49, 59, 61, 30, 90, 29, 94, 26, 41, 89, 04, 53, 22, 83, 41, 09, 74, 90],
[48, 28, 26, 37, 28, 52, 77, 26, 51, 32, 18, 98, 79, 36, 62, 13, 17, 08, 19, 54, 89, 29, 73, 68, 42, 14, 08, 16, 70, 37],
[37, 60, 69, 70, 72, 71, 09, 59, 13, 60, 38, 13, 57, 36, 09, 30, 43, 89, 30, 39, 15, 02, 44, 73, 05, 73, 26, 63, 56, 86, 12],
[55, 55, 85, 50, 62, 99, 84, 77, 28, 85, 03, 21, 27, 22, 19, 26, 82, 69, 54, 04, 13, 07, 85, 14, 01, 15, 70, 59, 89, 95, 10, 19],
[04, 09, 31, 92, 91, 38, 92, 86, 98, 75, 21, 05, 64, 42, 62, 84, 36, 20, 73, 42, 21, 23, 22, 51, 51, 79, 25, 45, 85, 53, 03, 43, 22],
[75, 63, 02, 49, 14, 12, 89, 14, 60, 78, 92, 16, 44, 82, 38, 30, 72, 11, 46, 52, 90, 27, 08, 65, 78, 03, 85, 41, 57, 79, 39, 52, 33, 48],
[78, 27, 56, 56, 39, 13, 19, 43, 86, 72, 58, 95, 39, 07, 04, 34, 21, 98, 39, 15, 39, 84, 89, 69, 84, 46, 37, 57, 59, 35, 59, 50, 26, 15, 93],
[42, 89, 36, 27, 78, 91, 24, 11, 17, 41, 05, 94, 07, 69, 51, 96, 03, 96, 47, 90, 90, 45, 91, 20, 50, 56, 10, 32, 36, 49, 04, 53, 85, 92, 25, 65],
[52, 09, 61, 30, 61, 97, 66, 21, 96, 92, 98, 90, 06, 34, 96, 60, 32, 69, 68, 33, 75, 84, 18, 31, 71, 50, 84, 63, 03, 03, 19, 11, 28, 42, 75, 45, 45],
[61, 31, 61, 68, 96, 34, 49, 39, 05, 71, 76, 59, 62, 67, 06, 47, 96, 99, 34, 21, 32, 47, 52, 07, 71, 60, 42, 72, 94, 56, 82, 83, 84, 40, 94, 87, 82, 46],
[01, 20, 60, 14, 17, 38, 26, 78, 66, 81, 45, 95, 18, 51, 98, 81, 48, 16, 53, 88, 37, 52, 69, 95, 72, 93, 22, 34, 98, 20, 54, 27, 73, 61, 56, 63, 60, 34, 63],
[93, 42, 94, 83, 47, 61, 27, 51, 79, 79, 45, 01, 44, 73, 31, 70, 83, 42, 88, 25, 53, 51, 30, 15, 65, 94, 80, 44, 61, 84, 12, 77, 02, 62, 02, 65, 94, 42, 14, 94],
[32, 73, 09, 67, 68, 29, 74, 98, 10, 19, 85, 48, 38, 31, 85, 67, 53, 93, 93, 77, 47, 67, 39, 72, 94, 53, 18, 43, 77, 40, 78, 32, 29, 59, 24, 06, 02, 83, 50, 60, 66],
[32, 01, 44, 30, 16, 51, 15, 81, 98, 15, 10, 62, 86, 79, 50, 62, 45, 60, 70, 38, 31, 85, 65, 61, 64, 06, 69, 84, 14, 22, 56, 43, 09, 48, 66, 69, 83, 91, 60, 40, 36, 61],
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[17, 25, 21, 11, 72, 93, 33, 49, 64, 23, 53, 82, 03, 13, 91, 65, 85, 02, 40, 05, 42, 31, 77, 42, 05, 36, 06, 54, 04, 58, 07, 76, 87, 83, 25, 57, 66, 12, 74, 33, 85, 37, 74, 32, 20, 69, 03, 97, 91, 68, 82, 44, 19, 14, 89, 28, 85, 85, 80, 53, 34, 87, 58, 98, 88, 78, 48, 65, 98, 40, 11, 57, 10, 67, 70, 81, 60, 79, 74, 72, 97, 59, 79, 47, 30, 20, 54, 80, 89, 91, 14, 05, 33, 36, 79, 39],
[60, 85, 59, 39, 60, 07, 57, 76, 77, 92, 06, 35, 15, 72, 23, 41, 45, 52, 95, 18, 64, 79, 86, 53, 56, 31, 69, 11, 91, 31, 84, 50, 44, 82, 22, 81, 41, 40, 30, 42, 30, 91, 48, 94, 74, 76, 64, 58, 74, 25, 96, 57, 14, 19, 03, 99, 28, 83, 15, 75, 99, 01, 89, 85, 79, 50, 03, 95, 32, 67, 44, 08, 07, 41, 62, 64, 29, 20, 14, 76, 26, 55, 48, 71, 69, 66, 19, 72, 44, 25, 14, 01, 48, 74, 12, 98, 07],
[64, 66, 84, 24, 18, 16, 27, 48, 20, 14, 47, 69, 30, 86, 48, 40, 23, 16, 61, 21, 51, 50, 26, 47, 35, 33, 91, 28, 78, 64, 43, 68, 04, 79, 51, 08, 19, 60, 52, 95, 06, 68, 46, 86, 35, 97, 27, 58, 04, 65, 30, 58, 99, 12, 12, 75, 91, 39, 50, 31, 42, 64, 70, 04, 46, 07, 98, 73, 98, 93, 37, 89, 77, 91, 64, 71, 64, 65, 66, 21, 78, 62, 81, 74, 42, 20, 83, 70, 73, 95, 78, 45, 92, 27, 34, 53, 71, 15],
[30, 11, 85, 31, 34, 71, 13, 48, 05, 14, 44, 03, 19, 67, 23, 73, 19, 57, 06, 90, 94, 72, 57, 69, 81, 62, 59, 68, 88, 57, 55, 69, 49, 13, 07, 87, 97, 80, 89, 05, 71, 05, 05, 26, 38, 40, 16, 62, 45, 99, 18, 38, 98, 24, 21, 26, 62, 74, 69, 04, 85, 57, 77, 35, 58, 67, 91, 79, 79, 57, 86, 28, 66, 34, 72, 51, 76, 78, 36, 95, 63, 90, 08, 78, 47, 63, 45, 31, 22, 70, 52, 48, 79, 94, 15, 77, 61, 67, 68],
[23, 33, 44, 81, 80, 92, 93, 75, 94, 88, 23, 61, 39, 76, 22, 03, 28, 94, 32, 06, 49, 65, 41, 34, 18, 23, 08, 47, 62, 60, 03, 63, 33, 13, 80, 52, 31, 54, 73, 43, 70, 26, 16, 69, 57, 87, 83, 31, 03, 93, 70, 81, 47, 95, 77, 44, 29, 68, 39, 51, 56, 59, 63, 07, 25, 70, 07, 77, 43, 53, 64, 03, 94, 42, 95, 39, 18, 01, 66, 21, 16, 97, 20, 50, 90, 16, 70, 10, 95, 69, 29, 06, 25, 61, 41, 26, 15, 59, 63, 35]
]

4
haskell/p7.hs Normal file
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@@ -0,0 +1,4 @@
import Lib (primes)
main :: IO ()
main = putStr $ show $ primes !! (10001 - 1)

35
haskell/p8.hs Normal file
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@@ -0,0 +1,35 @@
import Data.Char (digitToInt)
main :: IO ()
main = putStr $ show solve
solve :: Int
solve = maximum $ map (product . map digitToInt) (substrings input 13)
where
substrings :: String -> Int -> [String]
substrings s n
| length s < n = []
| otherwise = take n s : substrings (tail s) n
input :: String
input =
"73167176531330624919225119674426574742355349194934\
\96983520312774506326239578318016984801869478851843\
\85861560789112949495459501737958331952853208805511\
\12540698747158523863050715693290963295227443043557\
\66896648950445244523161731856403098711121722383113\
\62229893423380308135336276614282806444486645238749\
\30358907296290491560440772390713810515859307960866\
\70172427121883998797908792274921901699720888093776\
\65727333001053367881220235421809751254540594752243\
\52584907711670556013604839586446706324415722155397\
\53697817977846174064955149290862569321978468622482\
\83972241375657056057490261407972968652414535100474\
\82166370484403199890008895243450658541227588666881\
\16427171479924442928230863465674813919123162824586\
\17866458359124566529476545682848912883142607690042\
\24219022671055626321111109370544217506941658960408\
\07198403850962455444362981230987879927244284909188\
\84580156166097919133875499200524063689912560717606\
\05886116467109405077541002256983155200055935729725\
\71636269561882670428252483600823257530420752963450"

6
haskell/p9.hs Normal file
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@@ -0,0 +1,6 @@
main :: IO ()
main = putStr $ show $ solve 1000
-- Brute search because don't care 🧌
solve :: Integer -> Integer
solve p = head [a * b * c | a <- [1 .. p], b <- [a + 1 .. p], let c = p - a - b, c > 0 && c ^ 2 == a ^ 2 + b ^ 2]

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@@ -2,3 +2,11 @@
name = "eulerfunt"
version = "0.1.0"
edition = "2021"
[[bin]]
name = "p1"
path = "./src/p1.rs"
[[bin]]
name = "p2"
path = "./src/p2.rs"

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@@ -10,9 +10,7 @@ version = "0.1.0"
edition = "2021"
EOF
if ! [ -e ./src/p*.rs ]; then
exit 0
fi
[[ ! $(ls ./src/p*.rs) ]] && exit 0
for problem in ./src/p*.rs; do
file=${problem##*/}

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@@ -0,0 +1,11 @@
pub fn fib_till(lim: u32) -> Vec<u32> {
let mut ret: Vec<u32> = vec![1, 2];
let mut n: usize = 2;
while ret[n - 1] <= lim {
ret.push(ret[n - 1] + ret[n - 2]);
n += 1;
}
ret
}

4
rust/src/p1.rs Normal file
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@@ -0,0 +1,4 @@
fn main() {
let multiple_sum = |x| (x..1000).step_by(x).into_iter().sum::<usize>();
print!("{}", multiple_sum(3) + multiple_sum(5) - multiple_sum(15));
}

6
rust/src/p2.rs Normal file
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@@ -0,0 +1,6 @@
use eulerfunt::fib_till;
fn main() {
let evenfib = fib_till(4000000).into_iter().filter(|x| x % 2 == 0);
print!("{}", evenfib.sum::<u32>());
}