day 1

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc2023"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "aoc2023"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

examples/day1_1.rs

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+fn main() {
+    let mut total = 0;
+    for line in std::io::stdin().lines() {
+        let line = line.unwrap();
+        if line.len() == 0 { continue }
+        let c1 = line.find(|c| ('0'..='9').contains(&c)).unwrap();
+        let c2 = line.rfind(|c| ('0'..='9').contains(&c)).unwrap();
+        total += (line.chars().nth(c1).unwrap() as u32 - '0' as u32) * 10 + (line.chars().nth(c2).unwrap() as u32 - '0' as u32);
+    }
+    println!("{}", total);
+}

examples/day1_2.rs

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+const WORDS: [&'static str; 10] = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
+
+fn main() {
+    let mut total = 0;
+    for line in std::io::stdin().lines() {
+        let line = line.unwrap();
+        if line.len() == 0 { continue }
+        let mut c1 = line.len() - 1;
+        let mut c2 = 0;
+        let mut n1 = 0;
+        let mut n2 = 0;
+        for (i, word) in WORDS.iter().enumerate() {
+            if let Some(d1) = line.find(word) {
+                if d1 <= c1 {
+                    c1 = d1;
+                    n1 = i;
+                }
+            }
+            if let Some(d2) = line.rfind(word) {
+                if d2 >= c2 {
+                    c2 = d2;
+                    n2 = i;
+                }
+            }
+        }
+        for (i, word) in ('0'..='9').enumerate() {
+            if let Some(d1) = line.find(word) {
+                if d1 <= c1 {
+                    c1 = d1;
+                    n1 = i;
+                }
+            }
+            if let Some(d2) = line.rfind(word) {
+                if d2 >= c2 {
+                    c2 = d2;
+                    n2 = i;
+                }
+            }
+        }
+        total += n1*10 + n2;
+    }
+    println!("{}", total);
+}

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}