feat(typescript): add ts solution for leetcode 297

typescript/0297-serialize-and-deserialize-binary-tree.ts

@@ -0,0 +1,54 @@
+/**
+ * Definition for a binary tree node.
+ * class TreeNode {
+ * val: number
+ * left: TreeNode | null
+ * right: TreeNode | null
+ * constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
+ * this.val = (val===undefined ? 0 : val)
+ * this.left = (left===undefined ? null : left)
+ * this.right = (right===undefined ? null : right)
+ * }
+ * }
+ */
+
+/*
+ * Encodes a tree to a single string.
+ */
+function serialize(root: TreeNode | null): string {
+ const box = [];
+
+ function cereal(root: TreeNode | null) {
+ if (root === null) return box.push(null);
+ box.push(root.val);
+ cereal(root.left);
+ cereal(root.right);
+ }
+ cereal(root);
+
+ return box.join(',');
+};
+
+/*
+ * Decodes your encoded data to tree.
+ */
+function deserialize(data: string): TreeNode | null {
+ const box: string[] = data.split(',');
+
+ function decereal(): TreeNode | null {
+ const val = box.shift();
+ if (val === '') return null;
+ const node = new TreeNode(Number(val));
+ node.left = decereal();
+ node.right = decereal();
+ return node;
+ }
+
+ return decereal();
+};
+
+
+/**
+ * Your functions will be called as such:
+ * deserialize(serialize(root));
+ */