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450.cpp
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450.cpp
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#include "leetcode.h"
class Solution {
private:
TreeNode* deleteRoot(TreeNode* root)
{
if (root == nullptr) {
return nullptr;
}
if (root->right == nullptr) {
TreeNode* ret = root->left;
delete root;
return ret;
} else {
TreeNode* rightMinNode = root->right;
while (rightMinNode->left != nullptr) {
rightMinNode = rightMinNode->left;
}
root->val = rightMinNode->val;
root->right = deleteNode(root->right, rightMinNode->val);
return root;
}
}
public:
TreeNode* deleteNode(TreeNode* root, int key)
{
if (root == nullptr) return nullptr;
if (root->val == key) {
return deleteRoot(root);
} else {
if (key < root->val) {
root->left = deleteNode(root->left, key);
} else {
root->right = deleteNode(root->right, key);
}
return root;
}
}
};