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[ACM] POJ 2689 Prime Distance (大区间素数筛选)
Prime Distance Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 12811   Accepted: 3420 Description The branch of mathematics called number theory is about p...
分类:其他好文   时间:2014-11-12 13:51:21    阅读次数:248
hdu 3694 10 福州 现场 E - Fermat Point in Quadrangle
In geometry the Fermat point of a triangle, also called Torricelli point, is a point such that the total distance from the three vertices of the trian...
分类:其他好文   时间:2014-11-10 21:14:40    阅读次数:269
HDU 5102 The K-th Distance
题意:给你n-1条边,然后没两个节点的距离按照递增的顺序,求出前k项的和。官方题解:把所有边(u,v) 以及(v,u)放入一个队列,队列每弹出一个元素(u,v),对于所有与u相邻的点w,如果w!=v,就把(w,u)入队。这样就能一个一个生成前K小的距离。 注意到每条边实际上会入队两次,只要把K翻倍且...
分类:其他好文   时间:2014-11-10 19:31:48    阅读次数:156
HDU5102(树的前k路径+队列)
The K-th Distance Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 332    Accepted Submission(s): 90 Problem Description Given a tre...
分类:其他好文   时间:2014-11-10 10:03:41    阅读次数:196
Print all nodes at distance k from a given node
Given a binary tree, a target node in the binary tree, and an integer value k, print all the nodes that are at distance k from the given target node. ...
分类:其他好文   时间:2014-11-09 23:30:26    阅读次数:235
HDU 5102 The K-th Distance(模拟)
题意:输入一棵树,输出前k小的点对最短距离dis(i,j)的和。模拟,官方题解说得很清楚了。不重复了。http://bestcoder.hdu.edu.cn/需要注意的是,复杂度要O(n+k),不能用set,map之类的标记是否访问。一开始TLE了,去掉标记后wa了。最后发现对队列的元素加个前缀,就...
分类:其他好文   时间:2014-11-09 19:27:27    阅读次数:278
hdu 5102 The K-th Distance (队列+生成法,,)
题意:N个点的一棵树。定义点u和点v的距离等于它们之间的路径(唯一的)的长度。这样我们可以得到n*(n-1)/2个距离。将它们从小到大排序,问前K个数的和是多少。思路:将边长为1的树枝都入队列。每次取出一个,然后从这根树枝的前端生出一个新点,变成距离加1的一根新树枝,将其入队列。如此操作下去。可得到...
分类:其他好文   时间:2014-11-09 15:07:22    阅读次数:186
HDU 5102 树分治
The K-th Distance Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 202    Accepted Submission(s): 50 Problem Description Given a tree, w...
分类:其他好文   时间:2014-11-09 13:59:19    阅读次数:376
Rearrange a string so that all same characters become d distance away
Given a string and a positive integer d. Some characters may be repeated in the given string. Rearrange characters of the given string such that the s...
分类:其他好文   时间:2014-11-08 16:27:57    阅读次数:186
POJ1987——Distance Statistics
Distance Statistics Time Limit: 2000MS   Memory Limit: 64000K Total Submissions: 1667   Accepted: 532 Case Time Limit: 1000MS Description Frustrated at the number of d...
分类:其他好文   时间:2014-11-05 13:10:43    阅读次数:217
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