Add D16P1

2019/16/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "day16"
+version = "0.1.0"
+authors = ["kageru <kageru@encode.moe>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2019/16/input

@@ -0,0 +1 @@
+59768092839927758565191298625215106371890118051426250855924764194411528004718709886402903435569627982485301921649240820059827161024631612290005106304724846680415690183371469037418126383450370741078684974598662642956794012825271487329243583117537873565332166744128845006806878717955946534158837370451935919790469815143341599820016469368684893122766857261426799636559525003877090579845725676481276977781270627558901433501565337409716858949203430181103278194428546385063911239478804717744977998841434061688000383456176494210691861957243370245170223862304663932874454624234226361642678259020094801774825694423060700312504286475305674864442250709029812379

2019/16/src/main.rs

@@ -0,0 +1,20 @@
+use std::io::{stdin, BufRead};
+use std::iter::*;
+
+#[rustfmt::skip]
+fn read_input() -> Vec<i16> {
+    stdin().lock().lines().next().unwrap().unwrap().chars().map(|c| c.to_string().parse().unwrap()).collect()
+}
+
+#[rustfmt::skip]
+fn main() {
+    let mut last_phase = read_input();
+    //let mut last_phase: Vec<i16> = "80871224585914546619083218645595".chars().map(|c| c.to_string().parse().unwrap()).collect();
+    for _ in 0..100 {
+        last_phase = (1..=last_phase.len()).map(|i| {
+            let mut pattern = [0i16, 1, 0, -1].iter().flat_map(|x| repeat(x).take(i)).cycle().skip(1);
+            last_phase.iter().map(|x| x*pattern.next().unwrap()).sum::<i16>().abs() % 10
+        }).collect();
+    }
+    println!("Part 1: {}", last_phase.iter().take(8).map(|n| n.to_string()).collect::<String>());
+}