2 files changed, 47 insertions(+), 1 deletions(-)

A data/day14
M src/bin/day14.rs

@@ 0,0 1,1 @@
+824501

@@ 1,1 1,46 @@
-fn main() {}
+static INPUT: &str = "data/day14";
+
+fn main() {
+    let input: usize = aoc::file::first_line(INPUT).parse().unwrap();
+    let inarr: Vec<u8> = format!("{}", input).bytes().map(|b| b - b'0').collect();
+    let mut st: Vec<u8> = vec![3, 7];
+    let mut e1 = 0;
+    let mut e2 = 1;
+    while st.len() < input + 10 {
+        let n = st[e1] + st[e2];
+        if n / 10 > 0 {
+            st.push(n / 10)
+        }
+        st.push(n % 10);
+        e1 = (e1 + st[e1] as usize + 1) % st.len();
+        e2 = (e2 + st[e2] as usize + 1) % st.len();
+    }
+    print!("  1: ");
+    for i in &st[input..input+10] {
+        print!("{}", i);
+    }
+    println!();
+    // reset for p2
+    st.clear();
+    st.push(3); st.push(7);
+    let mut e1 = 0;
+    let mut e2 = 1;
+    let mut p = 0;
+    let l = 'out: loop {
+        let n = st[e1] + st[e2];
+        if n / 10 > 0 {
+            st.push(n / 10)
+        }
+        st.push(n % 10);
+        e1 = (e1 + st[e1] as usize + 1) % st.len();
+        e2 = (e2 + st[e2] as usize + 1) % st.len();
+        while p + inarr.len() < st.len() {
+            //println!("{:15}: {:?}", p, &st[p..p+INARR.len()]);
+            if inarr == &st[p..p+inarr.len()] {
+                break 'out p;
+            }
+            p += 1;
+        }
+    };
+    println!("  2: {}", l);
+}