然后使用树形dp将结果一层一层返回至根节点,由于每个节点只遍历一次,因此不需要写成记忆化搜索的形式,当遇到更大的值时,更新结果 class Solution {private List<Integer>[] g;private int[] price;private long ans;public long maxOutput(int n, int[][] edges, int[] price) {this.price = price;g = ...
leetcode-2863. Maximum Length of Semi-Decreasing Subarrays - 单调stack 1 -- 6:38 App leetcode-2898. Maximum Linear Stock Score -decoupling -- -- 5:03 App leetcode-392. Is Subsequence - two-pointer 81 -- 11:30 App leetcode-2925. Maximum Score After Applying Operations on a Tree ...
合并两棵树后的最小直径 https://leetcode.cn/problems/find-minimum-diameter-after-merging-two-trees/solution/lian-jie-zhi-jing-zhong-dian-pythonjavac-0e1c/ 1617. 统计子树中城市之间最大距离 https://leetcode.cn/problems/count-subtrees-with-max-distance-between-cities/solution/tu-jie-on3-mei-...
2-1-树状dp-换根动态规划 https://leetcode-cn.com/problems/minimum-height-trees/solution/c-huan-gen-by-vclip-sa84/ https://leetcode-cn.com/problems/minimum-height-trees/solution/by-ac_oier-7xio/ 2-2-二分查找+动态规划 https://leetcode-cn.com/problems/russian-doll-envelopes/solution/by-...
View Code 优化:dp没必要开那么大,只留前两个值就可以 96. Unique Binary Search Trees 题意:求整数1~n能形成的二叉查找树的数目 我的思路:递归实现的分治,左右子树的数目相乘求和 我的代码: View Code 九章最优解:dp,两重循环 View Code 97. Interleaving String ...
leetcode 96. Unique Binary Search Trees Given n, how many structurally unique BST’s (binary search trees) that store values 1 … n? Example: Input: 3 Output: 5 Explanation: Given n = 3, there are a total of 5 unique BST’s:......
Problems must exhibit two properties in order to implement a Greedy solution: Optimal Substructure An optimal solution to the problem contains optimal solutions to the given problem's subproblems The Greedy Property An optimal solution is reached by "greedily" choosing the locally optimal choice ...
TCP:状态控制码(Code,Control Flag),占 6 比特,含义如下:URG:紧急比特(urgent),当 URG=1 时,表明紧急指针字段有效,代表该封包为紧急封包。它告诉系统此报文段中有紧急数据,应尽快传送(相当于高优先级的数据), 且上图中的 Urgent Pointer 字段也会被启用。 ACK:确认比特(Acknowledge)。只有当 ACK=1 时确认...
96. Unique Binary Search Trees(不同的二叉搜索树) 题目链接:https://leetcode.com/problems/unique-binary-search-trees/ Given n, how many structurally unique BST's (binary search trees) that store values 1 ... n? Example: 思路: &nbs......
{ // y 没有访问过且在 mask 中int ml = dfs(y) + 1;diameter = Math.max(diameter, maxLen + ml);maxLen = Math.max(maxLen, ml);}return maxLen;}}作者:灵茶山艾府链接:https://leetcode.cn/problems/count-subtrees-with-max-distance-between-cities/solutions/2162612/tu-jie-on3-mei-ju...