add initial data

valid-parentheses/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "valid-parentheses"
+version = "0.1.0"

valid-parentheses/Cargo.toml

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+[package]
+name = "valid-parentheses"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

valid-parentheses/src/main.rs

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+fn main() {
+    dbg!(is_valid("()".to_string()));
+    dbg!(is_valid("()[]{}".to_string()));
+    dbg!(is_valid("(]".to_string()));
+    dbg!(is_valid("([])".to_string()));
+    dbg!(is_valid("([)])".to_string()));
+}
+
+fn is_valid(s: String) -> bool {
+    let mut stack = vec![];
+    for c in s.chars() {
+        if OPEN.contains(&c) {
+            stack.push(c);
+        } else {
+            let last = stack.last();
+            if last.is_none() {
+                return false;
+            }
+            if matches(*last.unwrap(), c) {
+                stack.pop();
+            } else {
+                return false;
+            }
+        }
+    }
+    if !stack.is_empty() {
+        return false;
+    }
+    true
+}
+
+fn matches(c1: char, c2: char) -> bool {
+    (c1 == '(' && c2 == ')')
+        || (c1 == ')' && c2 == '(')
+        || (c1 == '[' && c2 == ']')
+        || (c1 == ']' && c2 == '(')
+        || (c1 == '{' && c2 == '}')
+        || (c1 == '}' && c2 == '{')
+}
+
+const OPEN: [char; 3] = ['(', '[', '{'];