same tree solution

Author: hyer0705

same-tree/hyer0705.ts

@@ -0,0 +1,21 @@
+/**
+ * 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)
+ *     }
+ * }
+ */
+
+function isSameTree(p: TreeNode | null, q: TreeNode | null): boolean {
+  if (!p && !q) return true;
+  if (!p || !q) return false;
+  if (p.val !== q.val) return false;
+
+  return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
+}