[2017][rust][1.0]

2017/rust/.gitignore

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2017/rust/Cargo.lock

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2017/rust/Cargo.toml

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+[package]
+name = "advent_of_code_2017"
+version = "0.1.0"
+authors = ["Alpha Chen <alpha.chen@gmail.com>"]
+
+[dependencies]
+failure = "0.1"

2017/rust/src/day_01.rs

@@ -0,0 +1,21 @@
+use failure::*;
+
+pub fn solve(input: &str) -> Result<String, Error> {
+    let mut input: Vec<u32> = input
+        .trim()
+        .chars()
+        .map(|x| x.to_digit(10).ok_or_else(|| format_err!("")))
+        .collect::<Result<_, _>>()?;
+
+    // 1
+    let last = input[input.len() - 1];
+    input.push(last);
+    Ok(
+        input
+            .windows(2)
+            .filter(|&a| a[0] == a[1])
+            .map(|a| a[0])
+            .sum::<u32>()
+            .to_string(),
+    )
+}

2017/rust/src/main.rs

@@ -0,0 +1,23 @@
+extern crate failure;
+
+use std::io::{self, Read};
+
+use failure::Error;
+
+mod day_01;
+
+fn main() {
+    if let Err(e) = run() {
+        eprintln!("{}", e);
+    }
+}
+
+fn run() -> Result<(), Error> {
+    let mut input = String::new();
+    io::stdin().read_to_string(&mut input)?;
+
+    let solution = day_01::solve(&input)?;
+    println!("{}", solution);
+
+    Ok(())
+}