1 files changed, 27 insertions, 0 deletions
diff --git a/works/solutions/leetcode/lccup/2021/1.cpp b/works/solutions/leetcode/lccup/2021/1.cpp
new file mode 100644
index 0000000..550da04
--- /dev/null
+++ b/works/solutions/leetcode/lccup/2021/1.cpp
@@ -0,0 +1,27 @@
+struct TreeNode {
+    int val;
+    TreeNode *left;
+    TreeNode *right;
+    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+};
+
+class Solution {
+public:
+    int visited[1001] {0};
+    int result = 0;
+
+    void DFS(TreeNode* r) {
+      if (!visited[r->val]) {
+        result += 1;
+        visited[r->val] = 1;
+      }
+
+      if (r->left) DFS(r->left);
+      if (r->right) DFS(r->right);
+    }
+
+    int numColor(TreeNode* root) {
+      DFS(root);
+      return result;
+    }
+};
+\ No newline at end of file