s0701
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include/s0701_insert_into_a_binary_search_tree.hpp
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include/s0701_insert_into_a_binary_search_tree.hpp
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#ifndef S0701_INSERT_INTO_A_BINARY_SEARCH_TREE_HPP
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#define S0701_INSERT_INTO_A_BINARY_SEARCH_TREE_HPP
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#include "structures.hpp"
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class S0701 {
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public:
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TreeNode* insertIntoBST(TreeNode* root, int val);
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};
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#endif
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# 二叉搜索树
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- [s0235](https://leetcode.cn/problems/lowest-common-ancestor-of-a-binary-search-tree/description/): 找两个指定节点的最近公共祖先。思路很简单,只要出现分岔(即一个在当前节点的左边,一个在当前节点的右边),那么这个分岔点就是最近公共祖先。
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- [s0701](https://leetcode.cn/problems/insert-into-a-binary-search-tree/description/): 插入节点。一层一层往下找,直到发现找不到了就在这个地方插入。
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src/s0701_insert_into_a_binary_search_tree.cpp
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src/s0701_insert_into_a_binary_search_tree.cpp
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#include "s0701_insert_into_a_binary_search_tree.hpp"
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TreeNode* S0701::insertIntoBST(TreeNode* root, int val) {
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TreeNode *cur = root;
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if (root == nullptr) {
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return new TreeNode(val);
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}
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while (true) {
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if (val < cur->val) {
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if (cur->left == nullptr) {
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cur->left = new TreeNode(val);
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break;
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} else {
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cur = cur->left;
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}
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} else {
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if (cur->right == nullptr) {
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cur->right = new TreeNode(val);
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break;
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} else {
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cur = cur->right;
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}
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}
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}
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return root;
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}
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