Add day 4 solution

2017/day/4/Cargo.lock

@@ -0,0 +1,4 @@
+[[package]]
+name = "day4"
+version = "0.1.0"
+

2017/day/4/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "day4"
+version = "0.1.0"
+authors = ["Wesley Moore <wes@wezm.net>"]
+
+[dependencies]

2017/day/4/input

@@ -0,0 +1,512 @@
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+slhm rdfm yxb rsobyt rdfm
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2017/day/4/problem.txt

@@ -0,0 +1,14 @@
+--- Day 4: High-Entropy Passphrases ---
+
+A new system policy has been put in place that requires all accounts to use a passphrase instead of simply a password. A passphrase consists of a series of words (lowercase letters) separated by spaces.
+
+To ensure security, a valid passphrase must contain no duplicate words.
+
+For example:
+
+    aa bb cc dd ee is valid.
+    aa bb cc dd aa is not valid - the word aa appears more than once.
+    aa bb cc dd aaa is valid - aa and aaa count as different words.
+
+The system's full passphrase list is available as your puzzle input. How many passphrases are valid?
+

2017/day/4/src/main.rs

@@ -0,0 +1,38 @@
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::collections::HashSet;
+
+fn main() {
+    let file = File::open("input").expect("unable to open input file");
+    let reader = BufReader::new(file);
+
+    let valid = reader.lines()
+        .map(|line| passphrase_is_valid(&line.unwrap()))
+        .filter(|valid| *valid == true)
+        .count();
+
+    println!("{}", valid);
+}
+
+fn passphrase_is_valid(passphrase: &str) -> bool {
+    let mut seen = HashSet::new();
+    !passphrase.split_whitespace().any(|word| seen.insert(word) == false)
+}
+
+// aa bb cc dd ee is valid.
+#[test]
+fn test_example1() {
+    assert_eq!(passphrase_is_valid("aa bb cc dd ee"), true)
+}
+
+// aa bb cc dd aa is not valid - the word aa appears more than once.
+#[test]
+fn test_example2() {
+    assert_eq!(passphrase_is_valid("aa bb cc dd aa"), false)
+}
+
+// aa bb cc dd aaa is valid - aa and aaa count as different words.
+#[test]
+fn test_example3() {
+    assert_eq!(passphrase_is_valid("aa bb cc dd aaa"), true)
+}