challenges 10 and 13

.gitignore

@@ -0,0 +1 @@
+/target

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"

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]

data/013-large-sum

@@ -0,0 +1,100 @@
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examples/010-sum-of-primes.rs

@@ -0,0 +1,57 @@
+struct PrimesIterator {
+    /// MUST contain all primes up to its max value!
+    known_primes: Vec<u128>,
+}
+
+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<Self::Item> {
+        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);
+}

examples/013-large-sum.rs

@@ -0,0 +1,13 @@
+fn load_data() -> Vec<u64> {
+    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::<u64>())
+}

src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}