2016/03

2016/03/Cargo.lock

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+[root]
+name = "03"
+version = "0.1.0"
+

2016/03/Cargo.toml

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+[package]
+name = "03"
+version = "0.1.0"
+authors = ["logaritmisk <anders.e.olsson@gmail.com>"]
+
+[dependencies]

2016/03/src/main.rs

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+use std::io::{self, BufRead};
+
+fn main() {
+    let stdin = io::stdin();
+
+    let input = stdin.lock()
+        .lines()
+        .filter_map(|line| line.ok())
+        .map(|line| {
+            line
+                .split_whitespace()
+                .filter_map(|x| x.parse::<i32>().ok())
+                .collect::<Vec<_>>()
+        })
+        .collect::<Vec<_>>();
+
+    let count_h = input
+        .iter()
+        .filter(|x| is_triangle(x[0], x[1], x[2]))
+        .count();
+
+    let count_v = input
+        .chunks(3)
+        .flat_map(|x| {
+            x[0]
+                .iter()
+                .zip(&x[1])
+                .zip(&x[2])
+                .map(|((x, y), z)| [x, y, z])
+        })
+        .filter(|x| is_triangle(*x[0], *x[1], *x[2]))
+        .count();
+
+    println!("count={}", count_h);
+    println!("count={}", count_v);
+}
+
+fn is_triangle(a: i32, b: i32, c: i32) -> bool {
+    a + b > c && b + c > a && c + a > b
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::is_triangle;
+
+    #[test]
+    fn example_01() {
+        assert_eq!(false, is_triangle(5, 10, 25));
+        assert_eq!(false, is_triangle(10, 25, 5));
+        assert_eq!(false, is_triangle(25, 10, 5));
+    }
+}