Make it more cursed

src/day06.rs

@@ -1,35 +1,31 @@
 use crate::Day;
 
-pub struct Day06(Vec<u8>);
+pub struct Day06([u64; 9]);
 
 impl Day for Day06 {
     fn init(content: String) -> Self {
-        Self(content.split(',').map(|x| x.parse().expect("This is not an int!")).collect::<Vec<_>>())
+        let c = content.split(',').map(|x| x.parse().expect("This is not an int!")).collect::<Vec<usize>>();
+        let mut w: [u64; 9] = [0, 0, 0, 0, 0, 0, 0, 0, 0];
+        for z in c {
+            w[z as usize] += 1;
+        }
+        Self(w)
     }
 
     fn part1(&self) -> String {
-        format!("{}", self.do_hashmap_magic(80))
+        format!("{}", self.do_magic(80))
     }
 
     fn part2(&self) -> String {
-        format!("{}", self.do_hashmap_magic(256))
+        format!("{}", self.do_magic(256))
     }
 }
 
 impl Day06 {
-
-    fn do_hashmap_magic(&self, days: u64) -> u64 {
-        let x = self.0.clone();
-        let mut w: [u64; 9] = [0, 0, 0, 0, 0, 0, 0, 0, 0];
-        for z in x {
-            w[z as usize] += 1;
-        }
-        for _ in 0..days {
-            w = Self::foo(w);
-        }
-        w.iter().sum()
+    fn do_magic(&self, days: u64) -> u64 {
+        (0..days).fold(self.0, Self::foo).iter().sum()
     }
-    fn foo([a, b, c, d, e, f, g, h, i]: [u64; 9]) -> [u64; 9] {
+    fn foo([a, b, c, d, e, f, g, h, i]: [u64; 9], _: u64) -> [u64; 9] {
         [b, c, d, e, f, g, h + a, i, a]
     }
 }