Time: 43 ms (56.88%), Space: 33.5 MB (64.32%) - LeetHub

gkapelyushok · Apr 18, 2022 · c9cce5d · c9cce5d
1 parent 5b703b1
commit c9cce5d
Showing 1 changed file with 30 additions and 0 deletions.
diff --git a/538-convert-bst-to-greater-tree/538-convert-bst-to-greater-tree.cpp b/538-convert-bst-to-greater-tree/538-convert-bst-to-greater-tree.cpp
@@ -0,0 +1,30 @@
+/**
+ * Definition for a binary tree node.
+ * struct TreeNode {
+ *     int val;
+ *     TreeNode *left;
+ *     TreeNode *right;
+ *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+ * };
+ */
+class Solution {
+public:
+    TreeNode* convertBST(TreeNode* root) {
+        convert(root);
+        return root;
+    }
+
+    void convert(TreeNode* root) {
+        if (!root) {
+            return;
+        }
+        convert(root->right);
+        root->val += sum;
+        sum = root->val;
+        convert(root->left);
+    }
+
+    int sum = 0;
+};