https://leetcode.com/problems/minimum-cost-tree-from-leaf-values/discuss/340027/Java-DP-easy-to-understand https://leetcode.com/problems/minimum-cost-tree-from-leaf-values/discuss/339959/One-Pass-O(N)-Time-and-Space LeetCode All in One 题目讲解汇总(持续更新中...)...
【LeetCode 983】 Minimum Cost For Tickets 题目描述 In a country popular for train travel, you have planned some train travelling one year in advance. The days of the year that you will travel is given as an array days. Each day is an integer from......
1 class Solution { 2 public int mctFromLeafValues(int[] arr) { 3 if(arr == null || arr.length < 2){ 4 return 0; 5 } 6 7 int res = 0; 8 Stack<Integer> stk = new Stack<>(); 9 stk.push(Integer.MAX_VALUE); 10 for(int num : arr){ 11 while(stk.peek() <= num){ ...
The values of arr correspond to the values of each leaf in an in-order traversal of the tree. (Recall that a node is a leaf if and only if it has 0 children.) The value of each non-leaf node is equal to the product of the largest leaf value in its left and right subtree respec...
the value of each non leaf node is equals to (the largest leaf value of left subtree) * (the largest leaf value of right subtree) So now, among all possible binary tree based on those two rules, return the smallest number, which is the sum of all the node values in this tree. ...
The values ofarrcorrespond to the values of each leaf in an in-order traversal of the tree.(Recall that a node is a leaf if and only if it has 0 children.) The value of each non-leaf node is equal to the product of the largest leaf value in its left and right subtree respectively...
The bottleneck in solution 1 is that it takes O(N) time to find a minimum value in a given range. We can use segment tree to acheive O(logN) minimum range query at the cost of O(N) preprocessing the target array into a segment tree. ...
the value of each non leaf node is equals to (the largest leaf value of left subtree) * (the largest leaf value of right subtree) So now, among all possible binary tree based on those two rules, return the smallest number, which is the sum of all the node values in this tree. ...