1 files changed, 43 insertions, 0 deletions
diff --git a/2015/puzzle-5.rs b/2015/puzzle-5.rs
new file mode 100644
index 0000000..c40e337
--- /dev/null
+++ b/2015/puzzle-5.rs
@@ -0,0 +1,43 @@
+use std::fs;
+
+fn is_nice_round1(line: &str) -> bool {
+    let do_not_want: [&str; 4] = ["ab", "cd", "pq", "xy"];
+    let mut unwanted_substr = false;
+    let mut has_consecutive = false;
+    let mut vowels = 0;
+    for i in 0..line.len() - 1 {
+        let substr: &str = &line[i..i + 2];
+        if do_not_want.iter().position(|&x| x == substr).is_some() {
+            unwanted_substr = true;
+            break;
+        }
+
+        if "aeiou".contains(substr.chars().nth(0).unwrap()) {
+            vowels += 1;
+        }
+
+        if substr.chars().nth(0).unwrap() == substr.chars().nth(1).unwrap() {
+            has_consecutive = true;
+        }
+    }
+
+    if "aeiou".contains(line.chars().nth(line.len() - 1).unwrap()) {
+        vowels += 1;
+    }
+
+    if unwanted_substr {
+        return false;
+    }
+    return vowels >= 3 && has_consecutive;
+}
+
+fn main() {
+    let binding = fs::read_to_string("5-input").expect("wget 5-input please.");
+    let contents: Vec<&str> = binding.split("\n").collect();
+    let nice_lines_1 = contents.iter().filter(|&x| is_nice_round1(x)).count();
+    println!("Round 1: {nice_lines_1}");
+}
+
+// Local Variables:
+// compile-command: "rustc puzzle-5.rs && ./puzzle-5"
+// End: