From ac8125750abed263619da4cc6d653bb5ab76f007 Mon Sep 17 00:00:00 2001
From: Yigit Sever
Date: Mon, 13 Dec 2021 00:36:34 +0300
Subject: 2021, day6: done
---
2021/day6/src/main.rs | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
create mode 100644 2021/day6/src/main.rs
(limited to '2021/day6/src')
diff --git a/2021/day6/src/main.rs b/2021/day6/src/main.rs
new file mode 100644
index 0000000..378764e
--- /dev/null
+++ b/2021/day6/src/main.rs
@@ -0,0 +1,33 @@
+use std::env;
+
+fn main() {
+ let args: Vec<String> = env::args().collect();
+
+ if args.len() != 2 {
+ eprintln!("Usage: {} <filename>", args[0]);
+ std::process::exit(1);
+ }
+ let mut smart_lanternfish: [u64; 9] = [0; 9];
+
+ let foo: String = std::fs::read_to_string(&args[1]).unwrap().parse().unwrap();
+ let mut lanternfish: Vec<u8> = Vec::new();
+ lanternfish.extend(foo.trim().split(",").map(|x| x.parse::<u8>().unwrap()));
+
+ for initial_fish in &lanternfish {
+ smart_lanternfish[*initial_fish as usize] += 1;
+ }
+
+ // println!("{:?}", smart_lanternfish);
+ for _day in 0..256 {
+ smart_lanternfish.rotate_left(1);
+ smart_lanternfish[6] += smart_lanternfish[8];
+ // println!(
+ // "After {day:>width$} days: {lanternfish:?}",
+ // day = _day,
+ // width = 2,
+ // lanternfish = smart_lanternfish
+ // );
+ }
+
+ println!("{}", smart_lanternfish.iter().sum::<u64>());
+}
--
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