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447. Number of Boomerangs
Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals ...
分类:其他好文   时间:2018-10-11 18:49:07    阅读次数:151
Prime Distance(POJ 2689)
Description The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number t ...
分类:其他好文   时间:2018-10-10 20:11:26    阅读次数:175
[LeetCode&Python] Problem 821. Shortest Distance to a Character
Given a string S and a character C, return an array of integers representing the shortest distance from the character C in the string. Example 1: Note ...
分类:编程语言   时间:2018-10-08 12:10:17    阅读次数:170
POJ 1986 Distance Queries 【输入YY && LCA(Tarjan离线)】
任意门:http://poj.org/problem?id=1986 Distance Queries Time Limit: 2000MS Memory Limit: 30000K Total Submissions: 16648 Accepted: 5817 Case Time Limit: 1 ...
分类:其他好文   时间:2018-10-07 12:12:56    阅读次数:127
【HDU2376】Average distance
题意 求树上每两点之间的距离之和的平均值。 分析 这个也算树形dp吗??我在专题里做到的,感觉完全不是啊... 去求两点的距离是很困难的,所以我们就求边的贡献吧。这个思路好像经常用到诶。 求出每个点的子树大小,对于(u,v,w)这样一条边,它的价值就是它左边的节点数*它右边的节点数*边权,即siz[ ...
分类:其他好文   时间:2018-10-06 22:11:45    阅读次数:255
[CODE FESTIVAL 2016 Exhibition A]Distance Pairs
题意:有一个未知的边权为$1$的图,给定所有点到$1$的最短路$a_i$和到$2$的最短路$b_i$,问是否存在这样的图,如果存在,问图中最少有多少条边 先考虑$a_i$,有$a_1=0,a_i\neq0(i\neq1)$,对于一条边$(x,y)$有$|a_x-a_y|\leq1$,对于任意$x\n ...
分类:其他好文   时间:2018-10-05 12:27:09    阅读次数:156
lyc的进程表
“少壮不努力,AK IOI。”—— "RLD" 2018/8/10 "Prime Distance On Tree" 和 "聪聪可可" 一样是点分治的计数题 但是合并信息是$ O( n ^ 2 ) $的,会炸,FFT可以加速。 2018/8/13 tset49 T1 还以为是polya定理,结果还是 ...
分类:系统相关   时间:2018-10-04 10:09:33    阅读次数:350
OpenCV——ORB特征检测与匹配
原文链接:https://mp.weixin.qq.com/s/S4b1OGjRWX1kktefyHAo8A 匹配 ...
分类:其他好文   时间:2018-10-02 20:37:37    阅读次数:283
leetcode461 - Hamming Distance - easy
The Hamming distance between two integers is the number of positions at which the corresponding bits are different.Given two integers x and y, calcula ...
分类:其他好文   时间:2018-10-02 17:34:25    阅读次数:156
[LeetCode] 245. Shortest Word Distance III 最短单词距离 III
This is a follow up of Shortest Word Distance. The only difference is now word1 could be the same as word2. Given a list of words and two words word1 ...
分类:其他好文   时间:2018-10-02 14:13:49    阅读次数:264
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