June 2018 Update

Task/Least-common-multiple/Rust/least-common-multiple.rust

@@ -1,16 +1,23 @@
-use std::cmp::{min, max};
-fn gcd_stein(a: usize, b: usize) -> usize {
+use std::cmp::{max, min};
+
+fn gcd(a: usize, b: usize) -> usize {
     match ((a, b), (a & 1, b & 1)) {
-        ((x, y), _) if x == y               => y,
-        ((0, x), _) | ((x, 0), _)           => x,
+        ((x, y), _) if x == y => y,
+        ((0, x), _) | ((x, 0), _) => x,
         ((x, y), (0, 1)) | ((y, x), (1, 0)) => gcd(x >> 1, y),
-        ((x, y), (0, 0))                    => gcd(x >> 1, y >> 1) << 1,
-        ((x, y), (1, 1))                    => { let (x, y) = (min(x, y), max(x, y));
-                                                 gcd((y - x) >> 1, x)
-                                               }
-        _                                   => unreachable!(),
+        ((x, y), (0, 0)) => gcd(x >> 1, y >> 1) << 1,
+        ((x, y), (1, 1)) => {
+            let (x, y) = (min(x, y), max(x, y));
+            gcd((y - x) >> 1, x)
+        }
+        _ => unreachable!(),
     }
 }
+
 fn lcm(a: usize, b: usize) -> usize {
-    a * b / gcd_stein(a,b)
+    a * b / gcd(a, b)
+}
+
+fn main() {
+    println!("{}", lcm(6324, 234))
 }