题意 PDF 分析 问题可以转化为小问题,即两条狗分别在线段上运动. 然后用相对运动知识可以认为甲不动,乙在线段上运动. 小问题就转化为点到线段的最小或最大距离. 时间复杂度\(O(I \times (A+B))\) 代码 #include<iostream> #include<cstdio> #include<cstdlib> #include<cmath> #include<set> #include<map> #include&…

Dog Distance [题目链接]Dog Distance [题目类型]几何 &题解: 蓝书的题,刘汝佳的代码,学习一下 &代码: // UVa11796 Dog Distance // Rujia Liu #include<cstdio> #include<cmath> #include<algorithm> using namespace std; const double eps = 1e-8; int dcmp(double x) { if(…

题目传送门 题意:两只狗在折线上跑,速度未知,同时出发,同时达到.问跑的过程中,两狗的最大距离和最小距离的差 分析:训练指南P261,考虑相对运动,设A静止不动,B相对A运动,相对的运动向量:Vb - Va(可以理解为速度矢量),那么就是pa到线段pb-pb+Vb-Va的距离最值 /************************************************ * Author :Running_Time * Created Time :2015/10/22 星期四 10:21…

题意  两条狗啊,同时跑,,同时结束,各自跑各自的道路,问跑的过程中,他们最大距离和最小距离的差: 方法  恶心一点就是,最大最小距离的求解方法,假设两只狗都只有一条线段要跑,则可以判定在端点处有最大值,最小值的求解方法就是,把一条狗的奔跑方向分解成另一个狗的奔跑方向 + 另外一个向量,这样这条狗相对于另外一条狗处于相对静止:只要求点到线段的最小距离便是: 如果有两段以上的线段:考虑第一条线段:肯定会有一条狗先跑完第一段,另外一条狗没有跑完第一段,根据比例关系我们可以知道那条没有跑完的狗跑到那里…

题目链接:http://acm.hust.edu.cn/vjudge/problem/viewProblem.action?id=31962 [代码] #include<cstdio> #include<cmath> #include<algorithm> using namespace std; ; ; ? - : ; } struct Point { double x, y; Point(, ):x(x),y(y) { } }; typedef Point Vect…

题链: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2896 题解: 计算几何,骚操作 对于简单情况,即两只狗的路线均为一条线段, 可以从相对运动的角度出发,考虑一直狗不动,另一只狗在运动. 而由于两只狗此时都在做匀速直线运动,所以在那只不懂的狗看来,另一直狗也在匀速直线前行.(物理老师:速度的矢量和!) 所以这个简单情况下,问题就变为…

http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2896 题目大意: 甲和乙两条狗分别沿着一条折线跑,它们速度未知,但同时出发并且同时到达终点,并且都是匀速奔跑.求奔跑过程中两只狗的最大距离与最小距离之差. 思路: 因为运动是相对的,我们可以认为甲静止不动,乙沿着直线走.则问题就转化为点到线段的最小距离. 那么,我们对于每段分析,看谁先到达该…

比赛链接: http://vjudge.net/contest/view.action?cid=48069#overview 题目来源: lrj训练指南---二维几何计算   ID Title Problem A Morley's Theorem   (向量夹角+向量旋转+两直线交点) Problem B That Nice Euler Circuit  (欧拉定理 F = E + 2 - V, 求直线相交+ 判断点是否在直线上)   Problem C Dog Distance   (好题,…

描述 https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2896 两只狗分别沿着各自的折线匀速跑,同时出发,同时到达.求其间它们两的最大距离和最小距离之差. 11796Dog DistanceTwo dogs, Ranga and Banga, are running randomly following twodifferent paths…

C Dog Distance Input Standard Input Output Standard Output Two dogs, Ranga and Banga, are running randomly following two different paths. They both run for T seconds with different speeds. Ranga runs with a constant speed of R m/s, whereas Banga runs…

前提 已经很久没深入研究过算法相关的东西,毕竟日常少用,就算死记硬背也是没有实施场景导致容易淡忘.最近在做一个脱敏数据和明文数据匹配的需求的时候,用到了一个算法叫Levenshtein Distance Algorithm,本文对此算法原理做简单的分析,并且用此算法解决几个常见的场景. 什么是Levenshtein Distance Levenshtein Distance,一般称为编辑距离(Edit Distance,Levenshtein Distance只是编辑距离的其中一种)或者莱文斯坦…

The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Now your job is to find the total Hamming distance between all pairs of the given numbers. Example: Input: 4, 14, 2 Output: 6 Explanat…

The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calculate the Hamming distance. Note:0 ≤ x, y < 231. Example: Input: x = 1, y = 4 Output: 2 Explanation: 1…

Given a non-empty string str and an integer k, rearrange the string such that the same characters are at least distance k from each other. All input strings are given in lowercase letters. If it is not possible to rearrange the string, return an empt…

You want to build a house on an empty land which reaches all buildings in the shortest amount of distance. You can only move up, down, left and right. You are given a 2D grid of values 0, 1 or 2, where: Each 0 marks an empty land which you can pass b…

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 and word2, return the shortest distance between these two words in the list. word1 and word2 may be…

This is a follow up of Shortest Word Distance. The only difference is now you are given the list of words and your method will be called repeatedly many times with different parameters. How would you optimize it? Design a class which receives a list…

Given a list of words and two words word1 and word2, return the shortest distance between these two words in the list. For example,Assume that words = ["practice", "makes", "perfect", "coding", "makes"]. G…

Given two strings S and T, determine if they are both one edit distance apart. 这道题是之前那道Edit Distance的拓展,然而这道题并没有那道题难,这道题只让我们判断两个字符串的编辑距离是否为1,那么我们只需分下列三种情况来考虑就行了: 1. 两个字符串的长度之差大于1,那么直接返回False 2. 两个字符串的长度之差等于1,那么长的那个字符串去掉一个字符,剩下的应该和短的字符串相同 3. 两个字符串的长度之…

Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a characterc) Replace…

Levenshtein distance,中文名为最小编辑距离,其目的是找出两个字符串之间需要改动多少个字符后变成一致.该算法使用了动态规划的算法策略,该问题具备最优子结构,最小编辑距离包含子最小编辑距离,有下列的公式. 其中d[i-1,j]+1代表字符串s2插入一个字母才与s1相同,d[i,j-1]+1代表字符串s1删除一个字母才与s2相同,然后当xi=yj时,不需要代价,所以和上一步d[i-1,j-1]代价相同,否则+1,接着d[i,j]是以上三者中最小的一项. 算法实现(C#): 假设两个…

1.首先将word文档解压缩为zip /** * 修改后缀名 */ public static String reName(String path){ File file=new File(path); String filename=file.getAbsolutePath(); if(filename.indexOf(".")>=0){ filename=filename.substring(0,filename.lastIndexOf(".")); }…

The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Now your job is to find the total Hamming distance between all pairs of the given numbers. Example: Input: 4, 14, 2 Output: 6 Explanat…

The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calculate the Hamming distance. Note:0 ≤ x, y < 231. Example: Input: x = 1, y = 4 Output: 2 Explanation: 1…

题目: The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calculate the Hamming distance. Note:0 ≤ x, y < 231. Example: Input: x = 1, y = 4 Output: 2 Explanatio…

马氏距离(Mahalanobis distance)是由印度统计学家马哈拉诺比斯(P. C. Mahalanobis)提出的,表示数据的协方差距离.它是一种有效的计算两个未知样本集的相似度的方法.与欧氏距离不同的是它考虑到各种特性之间的联系(例如:一条关于身高的信息会带来一条关于体重的信息,因为两者是有关联的)并且是尺度无关的(scale-invariant),即独立于测量尺度. 对于一个均值为,协方差矩阵为Σ的多变量矢量,其马氏距离为 马氏距离也可以定义为两个服从同一分布并且其协方差矩阵为Σ的…

C. Bear and String Distance time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Limak is a little polar bear. He likes nice strings - strings of length n, consisting of lowercase English letter…

编辑距离 编辑距离(Edit Distance),又称Levenshtein距离,是指两个字串之间,由一个转成另一个所需的最少编辑操作次数.许可的编辑操作包括将一个字符替换成另一个字符,插入一个字符,删除一个字符.一般来说,编辑距离越小,两个串的相似度越大.例如将kitten一字转成sitting:sitten (k→s)sittin (e→i)sitting (→g)俄罗斯科学家Vladimir Levenshtein在1965年提出这个概念. 应用 最小编辑距离通常作为一种相似度计算函数被用…

Edit Distance Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a chara…

原题链接在这里:https://leetcode.com/problems/total-hamming-distance/ 题目: The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Now your job is to find the total Hamming distance between all pairs…