From 9de1d92c6cd0da661eeefcba47e2f4e7a2aa9c59 Mon Sep 17 00:00:00 2001 From: Leonora Tindall Date: Wed, 13 Oct 2021 08:32:23 -0500 Subject: [PATCH] challenges 10 and 13 --- .gitignore | 1 + Cargo.lock | 7 +++ Cargo.toml | 8 +++ data/013-large-sum | 100 ++++++++++++++++++++++++++++++++++ examples/010-sum-of-primes.rs | 57 +++++++++++++++++++ examples/013-large-sum.rs | 13 +++++ src/main.rs | 3 + 7 files changed, 189 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 data/013-large-sum create mode 100644 examples/010-sum-of-primes.rs create mode 100644 examples/013-large-sum.rs create mode 100644 src/main.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/target diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..5104046 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,7 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "euler" +version = "0.1.0" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..771b683 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,8 @@ +[package] +name = "euler" +version = "0.1.0" +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] diff --git a/data/013-large-sum b/data/013-large-sum new file mode 100644 index 0000000..e3b3e9f --- /dev/null +++ b/data/013-large-sum @@ -0,0 +1,100 @@ +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 \ No newline at end of file diff --git a/examples/010-sum-of-primes.rs b/examples/010-sum-of-primes.rs new file mode 100644 index 0000000..4db43ff --- /dev/null +++ b/examples/010-sum-of-primes.rs @@ -0,0 +1,57 @@ +struct PrimesIterator { + /// MUST contain all primes up to its max value! + known_primes: Vec, +} + +impl PrimesIterator { + fn new() -> Self { + PrimesIterator { + known_primes: Vec::new(), + } + } + + /// Checks if a value is prime based on the values within the known_primes vector + fn is_known_prime(&self, candidate: u128) -> bool { + for prime in self.known_primes.iter() { + if *prime > (candidate + 1) / 2 { + // We have exhausted all divisor candidates. + return true; + } + + if candidate % *prime == 0 { + return false; + } + } + true + } +} + +impl Iterator for PrimesIterator { + type Item = u128; + + fn next(&mut self) -> Option { + if self.known_primes.is_empty() { + self.known_primes.push(2); + Some(2) + } else if self.known_primes.len() == 1 { + self.known_primes.push(3); + Some(3) + } else { + let mut last_checked = *self.known_primes.last().unwrap() + 2; + while !self.is_known_prime(last_checked) { + last_checked += 2; + } + self.known_primes.push(last_checked); + Some(last_checked) + } + } +} + +fn main() { + let sum: u128 = PrimesIterator::new() + .take_while(|v| *v < 2_000_000) + .enumerate() + .map(|(i, v)| { if i % 1000 == 0 { println!("{}", v); }; v }) + .sum(); + println!("{}", sum); +} diff --git a/examples/013-large-sum.rs b/examples/013-large-sum.rs new file mode 100644 index 0000000..d3eb40b --- /dev/null +++ b/examples/013-large-sum.rs @@ -0,0 +1,13 @@ +fn load_data() -> Vec { + use std::fs::read_to_string; + let contents = std::fs::read_to_string("data/013-large-sum").expect("could not load data file. error"); + contents.split_whitespace().map(|line| { + // We only care about the first 10 digits. + // For 50 numbers, which we know there are, + // taking the next 5 digits will give us enough accuracy. + u64::from_str_radix(&line[0..15], 10).expect("couldn't parse input value's initial digits. error") + }).collect() +} +fn main() { + println!("{}", load_data().into_iter().sum::()) +} \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..e7a11a9 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,3 @@ +fn main() { + println!("Hello, world!"); +}