day 6 testing

rust/day6/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day6"
+version = "0.1.0"

rust/day6/Cargo.toml

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+[package]
+name = "day6"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rust/day6/src/main.rs

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+use std::fs;
+use std::io::BufRead;
+
+static PATH: &'static str = "../../inputs/input-day6";
+
+fn remove_whitespace(s: &str) -> String {
+    return s.split_whitespace().collect();
+}
+
+fn load_file() -> Result<Vec<i64>, std::io::Error> {
+    let file = fs::File::open(PATH)?;
+    let reader = std::io::BufReader::new(file);
+    let res: Vec<i64> = reader.split(b',').map(|p| {
+        let p = p.unwrap();
+        let v = String::from_utf8_lossy(&p);
+        return remove_whitespace(&v).parse::<i64>().unwrap();
+    }).collect();
+    return Ok(res);
+}
+
+fn run_day(v: &mut Vec<i64>) {
+    let len = v.len();
+
+    for i in 0..len {
+        if v[i] == 0 {
+            v[i] = 6;
+            v.push(8);
+        } else {
+            v[i] -= 1;
+        }
+    }
+}
+
+fn part1() {
+    let mut x = load_file().unwrap();
+
+    for _ in 0..80 {
+        run_day(&mut x);
+    }
+
+    println!("total: {}", x.len());
+}
+
+fn part2() {
+    let mut x = load_file().unwrap();
+
+    for _ in 0..256 {
+        run_day(&mut x);
+    }
+
+    println!("total: {}", x.len());
+}
+
+fn main() {
+    part1();
+    part2();
+}