27 lines
624 B
C++
27 lines
624 B
C++
#include <functional>
|
|
|
|
struct TreeNode {
|
|
int val;
|
|
TreeNode* left;
|
|
TreeNode* right;
|
|
explicit TreeNode(int x, TreeNode* left = nullptr, TreeNode* right = nullptr) : val(x), left(left), right(right) {}
|
|
};
|
|
|
|
class Solution {
|
|
public:
|
|
static TreeNode* convertBST(TreeNode* root) {
|
|
if (!root)
|
|
return nullptr;
|
|
int x = 0;
|
|
std::function<void(TreeNode*)> reversedInOrderTraverse = [&](TreeNode* r) {
|
|
if (r->right)
|
|
reversedInOrderTraverse(r->right);
|
|
r->val = (x += r->val);
|
|
if (r->left)
|
|
reversedInOrderTraverse(r->left);
|
|
};
|
|
reversedInOrderTraverse(root);
|
|
return root;
|
|
}
|
|
};
|