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Update 0450.删除二叉搜索树中的节点.md JavaScript递归版本

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w2xi
2022-07-06 22:01:14 +08:00
parent 28c452d73d
commit 0ee18c392d
1 changed files with 34 additions and 23 deletions
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57
problems/0450.删除二叉搜索树中的节点.md
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@ -456,31 +456,42 @@ func deleteNode(root *TreeNode, key int) *TreeNode {
* @param {number} key
* @return {TreeNode}
*/
var deleteNode = function (root, key) {
if (root === null)
return root;
if (root.val === key) {
if (!root.left)
return root.right;
else if (!root.right)
return root.left;
else {
let cur = root.right;
while (cur.left) {
cur = cur.left;
}
cur.left = root.left;
root = root.right;
delete root;
return root;
}
}
if (root.val > key)
root.left = deleteNode(root.left, key);
if (root.val < key)
var deleteNode = function(root, key) {
if (!root) return null;
if (key > root.val) {
root.right = deleteNode(root.right, key);
return root;
return root;
} else if (key < root.val) {
root.left = deleteNode(root.left, key);
return root;
} else {
// 场景1: 该节点是叶节点
if (!root.left && !root.right) {
return null
}
// 场景2: 有一个孩子节点不存在
if (root.left && !root.right) {
return root.left;
} else if (root.right && !root.left) {
return root.right;
}
// 场景3: 左右节点都存在
const rightNode = root.right;
// 获取最小值节点
const minNode = getMinNode(rightNode);
// 将待删除节点的值替换为最小值节点值
root.val = minNode.val;
// 删除最小值节点
root.right = deleteNode(root.right, minNode.val);
return root;
}
};
function getMinNode(root) {
while (root.left) {
root = root.left;
}
return root;
}
```
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