organised 2024 year and added day4 in rust solution

2024/1/day1/Cargo.lock

@@ -0,0 +1,16 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day1"
+version = "0.1.0"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.167"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09d6582e104315a817dff97f75133544b2e094ee22447d2acf4a74e189ba06fc"

2024/1/day1/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "day1"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+libc = "0.2.167"

2024/1/day1/src/main.rs

@@ -0,0 +1,47 @@
+use std::io::{stdin, Read};
+use libc::{clock_gettime, timespec, CLOCK_PROCESS_CPUTIME_ID};
+
+fn main() {
+    let mut data = String::new();
+    stdin().read_to_string(&mut data).unwrap();
+
+    let mut begin = timespec {
+        tv_sec: 0,
+        tv_nsec: 0,
+    };
+    unsafe {
+        clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &mut begin);
+    };
+
+    let mut num1 = vec![];
+    let mut num2 = vec![];
+
+    for line in data.lines() {
+        let numbers: Vec<&str> = line.split("   ").collect();
+        let num11: i32 = numbers[0].parse().unwrap();
+        let num22: i32 = numbers[1].parse().unwrap();
+        num1.push(num11);
+        num2.push(num22);
+    }
+    num1.sort_unstable();
+    num2.sort_unstable();
+
+    let mut sum = 0;
+    for i in 0..num1.len() {
+        let num_sum = num1[i].abs_diff(num2[i]);
+        sum += num_sum;
+    }
+
+    let mut end = timespec {
+        tv_sec: 0,
+        tv_nsec: 0,
+    };
+    unsafe {
+        clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &mut end);
+    };
+    println!("{sum:?}");
+    println!(
+        "time: {:.6}ms",
+        (end.tv_nsec - begin.tv_nsec) as f32 / 1000.0 / 1000.0
+    );
+}