add day 1 and 2

2023/day1/.gitignore

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

2023/day1/Cargo.lock

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+# 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 = "0.2.164"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "433bfe06b8c75da9b2e3fbea6e5329ff87748f0b144ef75306e674c3f6f7c13f"

2023/day1/Cargo.toml

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+[package]
+name = "day1"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+libc = "0.2.164"

2023/day1/src/main.rs

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+use std::io::{self, Read};
+//use libc::{clock_gettime, timespec, CLOCK_PROCESS_CPUTIME_ID};
+
+fn main() {
+    let mut sum = 0;
+    let mut data = String::new();
+    io::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);
+    }; */
+    for line in data.lines() {
+        let mut vec = Vec::new();
+        for c in line.chars() {
+            if c.is_digit(10) {
+                let f = c.to_digit(10).unwrap();
+                vec.push(f);
+            }
+        }
+        let mut sussy = vec.first().unwrap().to_owned();
+        sussy = sussy * 10 + vec.last().unwrap().to_owned();
+        sum += sussy;
+        println!("{sum}");
+    };
+
+    /* let mut end = timespec {
+        tv_sec: 0,
+        tv_nsec: 0,
+    };
+    unsafe {
+        clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &mut end);
+    };
+    println!(
+        "time: {:.6}ms",
+        (end.tv_nsec - begin.tv_nsec) as f32 / 1000.0 / 1000.0
+    ); */
+}