Switch day 4 to HashMap

Cargo.lock

@@ -6,7 +6,6 @@ version = 3
 name = "advent-of-code-23"
 version = "0.1.0"
 dependencies = [
- "dict",
  "regex",
 ]
 
@@ -19,12 +18,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "dict"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39fbb71fba1e2c935f51b056de0d812d9b625b8165b2d7f8848902080fbdffb4"
-
 [[package]]
 name = "memchr"
 version = "2.6.4"

Cargo.toml

@@ -6,5 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-dict = "0.1.5"
 regex = "1.10.2"

src/day_4_2/mod.rs

-use crate::util::*;
+use std::collections::HashMap;
 
-use dict::{Dict, DictIface};
+use crate::util::*;
 
 pub fn solve_from_str(input: &str) -> u32 {
-    let mut copies: Dict<u32> = Dict::new();
+    let mut copies: HashMap<usize, u32> = HashMap::new();
 
     let total_cards = input.lines().count();
 
@@ -18,20 +18,19 @@ pub fn solve_from_str(input: &str) -> u32 {
             .map(|number| if winning.contains(number) { 1 } else { 0 })
             .sum::<u32>();
 
-        let multiplier = if !copies.contains_key(&i.to_string()) {
-            copies.add(i.to_string(), 1);
+        let multiplier = if !copies.contains_key(&i) {
+            copies.insert(i, 1);
             1
         } else {
-            *copies.get(&i.to_string()).unwrap()
+            *copies.get(&i).unwrap()
         };
 
         for k in i + 1..usize::min(i + amount as usize + 1, total_cards + 1) as usize {
-            let current_multiplier = copies.get(&k.to_string()).copied().unwrap_or(1);
+            let current_multiplier = copies.get(&k).copied().unwrap_or(1);
 
-            copies.remove_key(&k.to_string());
-            copies.add(k.to_string(), current_multiplier + multiplier);
+            copies.insert(k, current_multiplier + multiplier);
         }
     });
 
-    copies.iter().map(|card| card.val).sum()
+    copies.iter().map(|card| card.1).sum()
 }