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Fix avl_tree.cpp

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krahets 2023-03-16 22:50:17 +08:00
parent 0840bc2043
commit 28f3c98697
1 changed files with 9 additions and 5 deletions
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12
codes/cpp/chapter_tree/avl_tree.cpp
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@ -77,7 +77,8 @@ private:
/* 递归插入结点（辅助方法） */
TreeNode* insertHelper(TreeNode* node, int val) {
if (node == nullptr) return new TreeNode(val);
if (node == nullptr)
return new TreeNode(val);
/* 1. 查找插入位置，并插入结点 */
if (val < node->val)
node->left = insertHelper(node->left, val);
@ -94,7 +95,8 @@ private:
/* 获取中序遍历中的下一个结点（仅适用于 root 有左子结点的情况） */
TreeNode* getInOrderNext(TreeNode* node) {
if (node == nullptr) return node;
if (node == nullptr)
return node;
// 循环访问左子结点，直到叶结点时为最小结点，跳出
while (node->left != nullptr) {
node = node->left;
@ -104,7 +106,8 @@ private:
/* 递归删除结点（辅助方法） */
TreeNode* removeHelper(TreeNode* node, int val) {
if (node == nullptr) return nullptr;
if (node == nullptr)
return nullptr;
/* 1. 查找结点，并删除之 */
if (val < node->val)
node->left = removeHelper(node->left, val);
@ -126,8 +129,9 @@ private:
} else {
// 子结点数量 = 2 ，则将中序遍历的下个结点删除，并用该结点替换当前结点
TreeNode* temp = getInOrderNext(node->right);
int tempVal = temp->val;
node->right = removeHelper(node->right, temp->val);
node->val = temp->val;
node->val = tempVal;
}
}
updateHeight(node); // 更新结点高度