最后更新 二刷 09-Jna-2017 利用线段树进行区间查找,重点还是如何判断每一层的覆盖区间,和覆盖去见与当前NODE值域的关系. public class Solution { public int query(SegmentTreeNode root, int start, int end) { if (root == null) return 0; if (start > root.end || end < root.start) return 0; int coveredStart…

For an array, we can build a SegmentTree for it, each node stores an extra attribute count to denote the number of elements in the the array which value is between interval start and end. (The array may not fully filled by elements) Design a query me…

[题目描述] For an array, we can build a Segment Tree for it, each node stores an extra attribute count to denote the number of elements in the the array which value is between interval start and end. (The array may not fully filled by elements) Design a…

Segment Tree Query I For an integer array (index from 0 to n-1, where n is the size of this array), in the corresponding SegmentTree, each node stores an extra attribute max to denote the maximum number in the interval of the array (index from start…

For an integer array (index from 0 to n-1, where n is the size of this array), in the corresponding SegmentTree, each node stores an extra attribute max to denote the maximum number in the interval of the array (index from start to end). Design a que…

The structure of Segment Tree is a binary tree which each node has two attributes startand end denote an segment / interval. start and end are both integers, they should be assigned in following rules: The root's start and end is given bybuild method…

最后更新 二刷 09-Jan-17 正儿八经线段树的应用了. 查找区间内的值. 对于某一个Node,有这样的可能: 1)需要查找区间和当前NODE没有覆盖部分,那么直接回去就行了. 2)有覆盖的部分,覆盖部分作为新的查找区间,往左右子找. Time: O(NlgN) Space: O(lgN) for memory stack public class Solution { public int query(SegmentTreeNode root, int start, int end) {…

最后更新 08-Jan-2017 开始介绍线段树的主要作用了,可以快速在区间查找极值,我猜是这样的..... 一个NODE的最大值取决于它左边和右边最大值里大 按个,所以,所以什么?对了,我们该用post-order traversal来构建. public class Solution { public SegmentTreeNode build(int[] A) { // write your code here if (A.length == 0) return null; return…

Segment Tree Build I The structure of Segment Tree is a binary tree which each node has two attributes start and end denote an segment / interval. start and end are both integers, they should be assigned in following rules: The root's start and end i…

For a Maximum Segment Tree, which each node has an extra value max to store the maximum value in this node's interval. Implement a modify function with three parameter root, index and value to change the node's value with [start, end] = [index, index…