http://poj.org/problem?id=3349 题意:给出n组数据,每组数据有六个数,这n组数据中若有两组数据不管是从某个数顺时针读还是逆时针读都相同,输出“Twin snowflakes found.”,否则,输出 "No two snowflakes are alike." 思路:将每组数据求和对大素数取余,将sum相同的放在同一个邻接表中,然后从邻接表中查找符合条件的数据. #include <stdio.h> #include <algorith…

Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 30529   Accepted: 8033 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Y…

Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 30512   Accepted: 8024 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Y…

Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 39324   Accepted: 10298 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true.…

Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 27312   Accepted: 7213 题目链接:http://poj.org/problem?id=3349 Description You may have heard that no two snowflakes are alike. Your task is to write a program to dete…

Snowflake Snow Snowflakes Time Limit: 4000MS Memory Limit: 65536K Total Submissions: 27598 Accepted: 7312 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your…

http://poj.org/problem?id=3349 Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 37609   Accepted: 9878 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine…

Snowflake Snow Snowflakes Time Limit: 4000MS Memory Limit: 65536K Total Submissions: 34762 Accepted: 9126 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your…

Snowflake Snow Snowflakes Time Limit: 4000MS Memory Limit: 65536K Total Submissions: 37615 Accepted: 9882 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your…

链接:Snowflake Snow Snowflakes 判断所有的雪花里面有没有相同的 每次把雪花每个角的值进行相加和相乘 之后hash #include<iostream> #include<algorithm> #include<cstring> #include<stdio.h> using namespace std; typedef long long LL; ; ,p=; ],head[maxn],nex[maxn]; int he(int *…

Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 48646   Accepted: 12703 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true.…

Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 49991   Accepted: 13040 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true.…

Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 48624   Accepted: 12697 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true.…

相应POJ题目:点击打开链接 Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 33595   Accepted: 8811 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is…

POJ3349 Language: Snowflake Snow Snowflakes 题目:传送门 题解: 链表+hash的一道水题 填个坑补个漏... 代码: #include<cstdio> #include<cstring> #include<cstdlib> #include<cmath> #include<algorithm> using namespace std; typedef long long LL; ; ],snow[][…

Snowflake Snow Snowflakes Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 35642   Accepted: 9373 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Y…

Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 27277   Accepted: 7197 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your program will read info…

You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your program will read information about a collection of snowflakes, and search for a pair that may be identical. Each snow…

判断n朵雪花中,是否有完全一样的雪花.简单的hash,将雪花的六个边的权值加起来,记为sum,将sum相等的雪花归为一类,再在这里面根据题意找完全相同的,判断顺时针或者逆时针的所有角是否一模一样. #include<vector> #include<stdio.h> ; std::vector<]; ][]; int isSame(int s1,int s2){ ;i<;i++){ ; ,k=i;j<;j++,k=(k+)%){ if(arm[s1][j]!=ar…

Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your program will read information about a collection of snowflakes, and search for a pair that may be identica…

题目链接:http://poj.org/problem?id=3349 Description You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your program will read information about a collection of snowflakes, and se…

http://poj.org/problem?id=3349 题意 :分别给你n片雪花的六个角的长度,让你比较一下这n个雪花有没有相同的. 思路:一开始以为把每一个雪花的六个角的长度sort一下,然后再跟别的比,可实际上不是这样的,两个雪花相同的时候,角的顺序是固定的,可以是逆时针的也可以是顺时针的,因为雪花可以转动嘛,例如213456 和216543就是不一样的,这个题本身分类就是哈希,但是看到讨论里有人用暴力过的,,,我很是佩服,我压根就没往那个方面想,也许分类是哈希,我就认定哈希了吧,思维…

考察hash表: 每一个雪花都有各自的6个arm值,如果两个雪花从相同或者不同位置开始顺时针数或者逆时针数可以匹配上,那么这两个雪花就是相等的. 我们采用hash的方法,这样每次查询用时为O(1),总用时为O(n). hash的本质是把值映射到地址或者下标,如果不同的key值对应到相同的indice上的话,就需要进行chaining处理,吧indice指向一个链表,链表的每一个节点存储共享同一indice的不同key值. 因此问题的核心变成:吧相等的雪花映射到相同的indice上.这里雪花是一个…

题目链接: http://poj.org/problem?id=3349 #include <stdio.h> #include <string.h> #include <iostream> using namespace std; ; struct Snow { ]; }snow[]; struct HashTable { struct Snow *data; struct HashTable *next; HashTable() { next = NULL; } }…

今天学的hash.说实话还没怎么搞懂,明天有时间把知识点总结写了,今天就小小的写个结题报告吧! 题意: 在n (n<100000)个雪花中判断是否存在两片完全相同的雪花,每片雪花有6个角,每个角的长度限制为1000000 两片雪花相等的条件: 雪花6个角的长度按顺序相等(这个顺序即可以是顺时针的也可以是逆时针的) 解题思路: hash:连加求余法 求key 值,链地址法解决冲突,连加求余法 求key 值挺简单,关于链地址法解决冲突可以通过c++中,vector容器可以较为方便的实现. 下面先介绍…

吼哇! 关于开散列哈希: 哈希就是把xxx对应到一个数字的东西,可以理解成一个map<xxx, int>(是不是比喻反了) 我们要设计一个函数,这个函数要确保同一个东西能得到相同的函数值(废话) 然后在函数值域上开邻接表即可. 本人第一次写hash,还不是经典字符串hash而是雪花雪雪花(......) 那么接下来欣赏丑陋不堪的hash吧! (poj上C++过不了,RE,G++就过了,有剧毒) #include <cstdio> , P = ; ]; struct Snowflak…

http://poj.org/problem?id=3349 题意: 给出n片雪花留个角的长度,要求判断是否有一样的雪花. 思路: Hash表的应用. 首先将每个雪花所有角的总长计算出来,如果两片雪花相同的话那么总长也是相同的,然后加入vector容器当中,最后遍历vector数组,如果某个总长有大于1的雪花数,则有可能存在相同的雪花,此时需要比较这些雪花. #include <iostream> #include <stdio.h> #include <vector>…

题意:判断有没有两朵相同的雪花.每朵雪花有六瓣,比较花瓣长度的方法看是否是一样的,如果对应的arms有相同的长度说明是一样的.给出n朵,只要有两朵是一样的就输出有Twin snowflakes found.,如果任何两个都是不一样的输出No two snowflakes are alike.n=100,000. 思路:最简单的就是枚举每两片雪花,判断他们是否相同.时间复杂度为O(n*n),显然效果不理想.有没有更好的算法呢?hash:每读进一片雪花,将雪花hash,判断hash表里是否有相同的h…

[题目链接] http://poj.org/problem?id=3349 [算法] 哈希 若两片雪花相同,则它们六个角上的和一定相同,不妨令 H(A) = sigma(Ai) % P ,每次只要到哈希表里查是否出现相同雪花,即可 [代码] #include <algorithm> #include <bitset> #include <cctype> #include <cerrno> #include <clocale> #include &…

最近在对照省选知识点自己的技能树 今天是Hash 题面 大概是给定有n个6元序列 定义两个序列相等 当两个序列各自从某一个元素开始顺时针或者逆时针旋转排列能得到两个相同的序列 求这n个6元序列中是否有相等的序列 解释相等序列的样例 顺时针:如 1 2 3 4 5 6 与 2 3 4 5 6 1 相等 逆时针:如 1 2 3 4 5 6 与 6 5 4 3 2 1 相等 算法 对于各种类型的数列 字符串是否相等问题我们都可以用Hash解决 我们对一个序列A 定义其哈希值为 \(H(A) = (\s…