Data commit

Task/Balanced-brackets/Rust/balanced-brackets.rust

@@ -0,0 +1,40 @@
+extern crate rand;
+
+trait Balanced {
+    /// Returns true if the brackets are balanced
+    fn is_balanced(&self) -> bool;
+}
+
+impl<'a> Balanced for str {
+    fn is_balanced(&self) -> bool {
+        let mut count = 0;
+
+        for bracket in self.chars() {
+            let change = match bracket {
+                '[' => 1,
+                ']' => -1,
+                _ => panic!("Strings should only contain brackets")
+            };
+
+            count += change;
+            if count < 0 { return false; }
+        }
+
+        count == 0
+    }
+}
+
+/// Generates random brackets
+fn generate_brackets(num: usize) -> String {
+    use rand::random;
+
+    (0..num).map(|_| if random() { '[' } else { ']' }).collect()
+}
+
+fn main() {
+    for i in (0..10) {
+        let brackets = generate_brackets(i);
+
+        println!("{}    {}", brackets, brackets.is_balanced())
+    }
+}