https://leetcode.cn/problems/sZ59z6/

Author: masx200

README.md

@@ -10,6 +10,8 @@ leetcode 测试
 
 ##### 包含的内容如下
 
+https://leetcode.cn/problems/sZ59z6/
+
 https://leetcode.cn/problems/LwUNpT/
 
 https://leetcode.cn/problems/change-minimum-characters-to-satisfy-one-of-three-conditions/

sZ59z6/index.ts

@@ -0,0 +1,16 @@
+import { TreeNode } from "../mod.ts";
+
+export default function numColor(root: TreeNode | null): number {
+    if (!root) return 0;
+    const set = new Set<number>();
+
+    const q = [root];
+
+    for (const node of q) {
+        set.add(node.val);
+        ([node.left, node.right].filter(Boolean) as typeof q).forEach((n) =>
+            q.push(n)
+        );
+    }
+    return set.size;
+}