2 files changed, 52 insertions(+), 0 deletions(-)

A day6/input
A day6/main.rs

@@ 0,0 1,1 @@
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@@ 0,0 1,51 @@
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::path::Path;
+
+fn main() {
+
+    assert_eq!(first_marker("mjqjpqmgbljsphdztnvjfqwrcgsmlb"), 7);
+    assert_eq!(first_marker("bvwbjplbgvbhsrlpgdmjqwftvncz"), 5);
+    assert_eq!(first_marker("nppdvjthqldpwncqszvftbrmjlhg"), 6);
+    assert_eq!(first_marker("nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg"), 10);
+    assert_eq!(first_marker("zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw"), 11);
+
+    // File hosts must exist in current path before this produces output
+    if let Ok(lines) = read_lines("./input") {
+        // Consumes the iterator, returns an (Optional) String
+        for line in lines {
+            if let Ok(ip) = line {
+                println!("{}", first_marker(&ip));
+            }
+        }
+    }
+}
+
+fn first_marker(entire_string: &str) -> i32 {
+    const BUF_SIZE:i32 = 4;
+
+    'buffer: for buf_start in 0..((entire_string.len() as i32)-BUF_SIZE) {
+        let buf_end = buf_start + BUF_SIZE;
+        // can cast as u8 as long as Im confident input is ASCII
+        let buffer: &[u8] = &entire_string.as_bytes()[(buf_start as usize)..(buf_end as usize)];
+        for i in 0..(BUF_SIZE-1) {
+            for j in (i+1)..BUF_SIZE {
+                if buffer[i as usize] != buffer[j as usize] && i == (BUF_SIZE-2){
+                    return buf_start+BUF_SIZE;
+                }
+                if buffer[i as usize] == buffer[j as usize] {
+                    continue 'buffer;
+                }
+            }
+        }
+    }
+    return -1;
+}
+
+// The output is wrapped in a Result to allow matching on errors
+// Returns an Iterator to the Reader of the lines of the file.
+fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
+where P: AsRef<Path>, {
+    let file = File::open(filename)?;
+    Ok(io::BufReader::new(file).lines())
+}