2015/02

2015/02/Cargo.lock

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+[root]
+name = "02"
+version = "0.1.0"
+

2015/02/Cargo.toml

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+[package]
+name = "02"
+version = "0.1.0"
+authors = ["logaritmisk <anders.e.olsson@gmail.com>"]
+
+[dependencies]

2015/02/src/main.rs

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+use std::io::{self, BufRead};
+
+
+fn main() {
+    let stdin = io::stdin();
+    let handle = stdin.lock();
+
+    let count = handle
+        .lines()
+        .map(|x| x.unwrap())
+        .fold((0, 0), |acc, x| (acc.0 + calculate_paper(&x), acc.1 + calculate_ribbon(&x)));
+
+    println!("{:?}", count);
+}
+
+fn calculate_paper(dimensions: &str) -> i32 {
+    let parts = dimensions
+        .split('x')
+        .map(|x| x.parse::<i32>().unwrap())
+        .collect::<Vec<_>>();
+
+    let l = parts[0];
+    let w = parts[1];
+    let h = parts[2];
+
+    let e = l * w * h / parts.iter().max().unwrap();
+
+    (2 * l * w) + (2 * w * h) + (2 * h * l) + e
+}
+
+fn calculate_ribbon(dimensions: &str) -> i32 {
+    let parts = dimensions
+        .split('x')
+        .map(|x| x.parse::<i32>().unwrap())
+        .collect::<Vec<_>>();
+
+    let l = parts[0];
+    let w = parts[1];
+    let h = parts[2];
+
+    let e = (2 * l) + (2 * w) + (2 * h) - (2 * parts.iter().max().unwrap());
+
+    (l * w * h) + e
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::{calculate_paper, calculate_ribbon};
+
+    #[test]
+    fn example_01() {
+        assert_eq!(58, calculate_paper("2x3x4"));
+    }
+
+    #[test]
+    fn example_02() {
+        assert_eq!(43, calculate_paper("1x1x10"));
+    }
+
+    #[test]
+    fn example_03() {
+        assert_eq!(34, calculate_ribbon("2x3x4"));
+    }
+
+    #[test]
+    fn example_04() {
+        assert_eq!(14, calculate_ribbon("1x1x10"));
+    }
+}