From 745b6bfd5730a926a32c34d0b6e50a5685cbcddc Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@ashbysoft.com>
Date: Tue, 6 Dec 2022 09:25:51 +0000
Subject: Day 6 Reasonably simple this one :)

---
 src/day6.rs | 17 +++++++++++++++++
 src/main.rs |  2 ++
 2 files changed, 19 insertions(+)
 create mode 100644 src/day6.rs

(limited to 'src')

diff --git a/src/day6.rs b/src/day6.rs
new file mode 100644
index 0000000..1e2dcfd
--- /dev/null
+++ b/src/day6.rs
@@ -0,0 +1,17 @@
+pub fn run(input: String) {
+    //let wlen = 4;
+    let wlen = 14;
+    let (wix, _) = input.chars().collect::<Vec<char>>().windows(wlen).enumerate().find(|(_, win)| {
+        //println!("checking window {:?}", win.into_iter().map(|ch|{ch.to_owned()}).collect::<Vec<char>>());
+        let n = win.len();
+        for i in 0..n {
+            for j in i..n {
+                if i != j && win[i]==win[j] {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }).expect("no unique sequence!");
+    println!("Day 6: {}", wix + wlen);
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 12aa4b2..0be4d7f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,6 +5,7 @@ mod day2;
 mod day3;
 mod day4;
 mod day5;
+mod day6;
 
 fn main() {
     day1::run(fs::read_to_string("input/day1.txt").expect("Failed to read input file!"));
@@ -12,4 +13,5 @@ fn main() {
     day3::run(fs::read_to_string("input/day3.txt").expect("Failed to read input file!"));
     day4::run(fs::read_to_string("input/day4.txt").expect("Failed to read input file!"));
     day5::run(fs::read_to_string("input/day5.txt").expect("Failed to read input file!"));
+    day6::run(fs::read_to_string("input/day6.txt").expect("Failed to read input file!"));
 }
-- 
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