Created 22-Generate-Parentheses

Author: loczek

typescript/22-Generate-Parentheses.ts

@@ -0,0 +1,27 @@
+function generateParenthesis(n: number): string[] {
+  const stack: string[] = [];
+  const res: string[] = [];
+
+  function backtrack(openN: number, closedN: number) {
+    if (openN === n && closedN === n) {
+      res.push(stack.join(""));
+      return;
+    }
+
+    if (openN < n) {
+      stack.push("(");
+      backtrack(openN + 1, closedN);
+      stack.pop();
+    }
+
+    if (closedN < openN) {
+      stack.push(")");
+      backtrack(openN, closedN + 1);
+      stack.pop();
+    }
+  }
+
+  backtrack(0, 0);
+
+  return res;
+}