valid-parentheses

valid-parentheses/sol.rs

@@ -0,0 +1,21 @@
+impl Solution {
+    pub fn is_valid(s: String) -> bool {
+        let mut stack = vec![];
+        s.chars()
+            .all(|chr| match chr {
+                '(' | '{' | '[' => {
+                    stack.push(chr);
+                    true
+                },
+                _ => {
+                    let opened = stack.pop()
+                        .unwrap_or(' ');
+                    // Hacky way to check if the brackets match. Not scalable, but works here.
+                    if chr as u8 / 10 != opened as u8 / 10 {
+                        return false;
+                    }
+                    true
+                } 
+            }) && stack.len() == 0
+    }
+}