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0450.cpp
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0450.cpp
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class Solution {
public:
int getVal(TreeNode* root){
if(!root -> right)
return root -> val;
return getVal(root -> right);
}
TreeNode* delNode(TreeNode* root, int key){
if(!root)
return NULL;
if(root -> val == key){
TreeNode* temp;
if(!root -> left && !root -> right)
return NULL;
else if(!root -> left){
temp = root -> right;
delete(root);
return temp;
}
else if(!root -> right){
temp = root -> left;
delete(root);
return temp;
}
else{
root -> val = getVal(root -> left);
root -> left = delNode(root -> left, root -> val);
return root;
}
}
root -> left = delNode(root -> left, key);
root -> right = delNode(root -> right, key);
return root;
}
TreeNode* deleteNode(TreeNode* root, int key) {
TreeNode* result = delNode(root, key);
return result;
}
};