added 2024 part 2

2024/01/Rust/.gitignore

@@ -0,0 +1 @@
+/target

2024/01/Rust/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "day_1"
+version = "0.1.0"

2024/01/Rust/Cargo.toml

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+[package]
+name = "day_1"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

2024/01/Rust/src/example.txt

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+3   4
+4   3
+2   5
+1   3
+3   9
+3   3

2024/01/Rust/src/main.rs

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+use std::{collections::HashMap, fs};
+
+fn main() {
+    let file_name = "./src/example.txt";
+    let input = fs::read_to_string(file_name)
+    .expect("File was not able to be read");
+    let input_list:Vec<&str> = input.split("\r\n").collect();
+    let mut left_list: Vec<u32> = Vec::new();
+    let mut right_list: Vec<u32> = Vec::new();
+    input_list.into_iter().for_each(|row|{
+        let row_list:Vec<&str> = row.split("   ").collect();
+        left_list.push(row_list[0].parse().expect("Error Number conversion"));
+        right_list.push(row_list[1].parse().expect("Error Number conversion"));
+    });
+    left_list.sort();
+    right_list.sort();
+    let frequency_list = right_list
+        .iter()
+        .copied()
+        .fold(HashMap::new(), |mut map, val|{
+            map.entry(val)
+            .and_modify(|frq| *frq+=1)
+            .or_insert(1);
+            map
+        });
+    let result = left_list
+        .iter()
+        .zip(right_list.iter())
+        .map(|(l, r)| i32::abs(*r as i32 - *l as i32))
+        //.collect::<Vec<i32>>();
+        .sum::<i32>();
+    let result_2 = left_list
+        .iter()
+        .map(|v| v * frequency_list.get(v).unwrap_or(&0))
+        //.collect::<Vec<u32>>();
+        .sum::<u32>();
+    println!("Content:\n{:#?}", left_list);
+    //println!("Content:\n{:#?}", right_list);
+    println!("Content:\n{:#?}", frequency_list.clone());
+    println!("Content:\n{:#?}", result);
+    println!("Content:\n{:#?}", result_2);
+}