[2018][rust][1.0]

.gitignore

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+**/rust/target

2018/rust/Cargo.lock

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+[[package]]
+name = "advent_of_code_2018"
+version = "0.1.0"
+

2018/rust/Cargo.toml

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+[package]
+name = "advent_of_code_2018"
+version = "0.1.0"
+authors = ["Alpha Chen <alpha.chen@gmail.com>"]
+edition = "2018"
+
+[dependencies]

2018/rust/src/main.rs

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+use std::io::{self, Read};
+
+fn day_1(input: &str, delimiter: &str) -> String {
+    let sum: i32 = input
+        .split(delimiter)
+        .flat_map(|change| change.parse::<i32>().ok())
+        .sum();
+    sum.to_string()
+}
+
+#[test]
+fn test_day_1() {
+    assert_eq!(day_1("+1, -2, +3, +1", ", "), "3");
+}
+
+fn main() {
+    let mut input = String::new();
+    io::stdin().read_to_string(&mut input).unwrap();
+
+    let output = day_1(&input, "\n");
+    println!("{}", output);
+}