Day 2, 3, and 4.

2017/04/src/main.rs

@@ -0,0 +1,90 @@
+use std::io::{self, Read};
+
+
+fn has_duplicate_words(input: &str) -> bool {
+    let words = input.split_whitespace().collect::<Vec<_>>();
+
+    let mut iter = words.iter();
+
+    while let Some(needle) = iter.next() {
+        if iter.clone().any(|haystack| haystack == needle) {
+            return true;
+        }
+    }
+
+    false
+}
+
+fn has_anagram_words(input: &str) -> bool {
+    let words = input.split_whitespace().collect::<Vec<_>>();
+
+    let mut iter = words.iter();
+
+    while let Some(needle) = iter.next() {
+        let mut needle_chars = needle.chars().collect::<Vec<_>>();
+
+        needle_chars.sort();
+
+        for haystack in iter.clone() {
+            let mut haystack_chars = haystack.chars().collect::<Vec<_>>();
+
+            haystack_chars.sort();
+
+            if haystack_chars == needle_chars {
+                return true;
+            }
+        }
+    }
+
+    false
+}
+
+
+fn main() {
+    let mut input = String::new();
+
+    io::stdin()
+        .read_to_string(&mut input)
+        .expect("failed to parse input");
+
+    let part_one = input
+        .lines()
+        .map(|line| line.trim())
+        .filter(|line| !line.is_empty())
+        .filter(|line| !has_duplicate_words(line))
+        .count();
+
+    println!("part one: valid={}", part_one);
+
+    let part_two = input
+        .lines()
+        .map(|line| line.trim())
+        .filter(|line| !line.is_empty())
+        .filter(|line| !has_duplicate_words(line))
+        .filter(|line| !has_anagram_words(line))
+        .count();
+
+    println!("part two: valid={}", part_two);
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_duplicate_words() {
+        assert_eq!(has_duplicate_words("aa bb cc dd ee"), false);
+        assert_eq!(has_duplicate_words("aa bb cc dd aa"), true);
+        assert_eq!(has_duplicate_words("aa bb cc dd aaa"), false);
+    }
+
+    #[test]
+    fn test_anagram_words() {
+        assert_eq!(has_anagram_words("abcde fghij"), false);
+        assert_eq!(has_anagram_words("abcde xyz ecdab"), true);
+        assert_eq!(has_anagram_words("a ab abc abd abf abj"), false);
+        assert_eq!(has_anagram_words("iiii oiii ooii oooi oooo"), false);
+        assert_eq!(has_anagram_words("oiii ioii iioi iiio"), true);
+    }
+}