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hdu3709 Balanced Number 数位dp
题意:定义一个数为“balanced number” 当其满足存在一个数位pos(平衡点),在pos左边的数位的值乘与pos位的距离值的总和等于右 边的数位的值乘与pos位的距离值的总和,给定一个区间[l , r],求区间内有多少个balanced number。 思路:设dp[ pos ][ i ][ j ]表示平衡点在i位的情况下,当前考虑pos位,之前已形成的力矩为j(数乘以距离平衡点的...
分类:其他好文   时间:2015-01-24 18:49:44    阅读次数:131
Convert Sorted Array to Binary Search Tree
Given an array where elements are sorted in ascending order, convert it to a height balanced BST.思路比较简单,就是每次以中位数为根节点,然后左边即左子树,右边是右子树,递归下去即可超时代码(不知道为啥)...
分类:其他好文   时间:2015-01-23 19:56:34    阅读次数:202
二叉树系列 - 二叉搜索树 - 线性时间内把有序链表转化为BST
引言本文来自于Google的一道题目:how to merge two binary search tree into balanced binary search tree.how to merge two binary search tree into balanced binary searc...
分类:其他好文   时间:2015-01-22 14:39:12    阅读次数:207
二叉树系列 - 二叉搜索树 - 线性时间内把有序链表转化为BST
引言本文来自于Google的一道题目:how to merge two binary search tree into balanced binary search tree.how to merge two binary search tree into balanced binary searc...
分类:其他好文   时间:2015-01-22 13:15:23    阅读次数:129
[LeetCode] Convert Sorted Array to Binary Search Tree
Given an array where elements are sorted in ascending order, convert it to a height balanced BST.思路:递归的思路。思路与重建二叉树类似。时间复杂度O(n), 空间复杂度O(logN) 1 /** 2 ....
分类:其他好文   时间:2015-01-20 22:00:43    阅读次数:170
Convert Sorted List to Balanced Binary Search Tree (BST)
(http://leetcode.com/2010/11/convert-sorted-list-to-balanced-binary.html)Given a singly linked list where elements are sorted in ascending order, conv...
分类:其他好文   时间:2015-01-18 22:18:49    阅读次数:202
【leetcode】Convert Sorted List to Binary Search Tree (middle)
Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST.思路:题目看上去好像很难,但实际上很简单,递归做就行,每次找到左右子树对应的子链表...
分类:其他好文   时间:2015-01-18 21:03:17    阅读次数:241
[C++]LeetCode: 100 Convert Sorted Array to Binary Search Tree (AVL树)
题目:Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 思路:给出一个排序的数组,如何构造一个平衡二叉查找树?平衡二叉查找树要求任一结点的左右子树的高度差不能超过一,也叫做高度平衡树。如果让我们从一个排序数组中选取一个元素做树的根,我们会选择哪一个...
分类:编程语言   时间:2015-01-16 16:51:25    阅读次数:237
[LeetCode] Convert Sorted List to Binary Search Tree DFS,深度搜索
Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST.Hide TagsDepth-first SearchLinked List 这....
分类:其他好文   时间:2015-01-15 21:47:04    阅读次数:171
LeetCode--Convert Sorted Array to Binary Search Tree
Given an array where elements are sorted in ascending order, convert it to a height balanced BST. /** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * ...
分类:其他好文   时间:2015-01-14 15:35:32    阅读次数:178
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