题目链接:http://poj.org/problem?id=1094 题目意思:给出 n 个待排序的字母 和 m 种关系,问需要读到第 几 行可以确定这些字母的排列顺序或者有矛盾的地方,又或者虽然具体的字母顺序不能确定但至少不矛盾.这些关系均是这样的一种形式: 字母1 < 字母2 这道题目属于图论上的拓扑排序,由于要知道读入第几行可以确定具体的顺序,所以每次读入都需要进行拓扑排序来检验,这时每个点的入度就需要存储起来,所以就有了代码中memcpy 的使用了. 拓扑排序的思路很容易理解,但写起来…

poj 1094 Sorting It All Out Time Limit:1000MS     Memory Limit:10000KB     64bit IO Format:%lld & %llu Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from sm…

http://poj.org/problem?id=1094 这一题,看了个大牛的解题报告,思路变得非常的清晰: 1,先利用floyd_warshall算法求出图的传递闭包 2,再判断是不是存在唯一的拓扑排序,利用出度和入度是不是相加为n-1 3,利用拓扑排序求出当前的图形的唯一的拓扑排序 一开始我的思路跟上述的差不多,但是没有利用floyd_warshall算法求出传递闭包,准备着利用拓扑排序求出是不是存在着有环回路,我觉得我的这个思路也是可以的.等一下我会将我的这个思路给写成程序.在我的百度…

http://poj.org/problem?id=1094 Sorting It All Out Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 24505   Accepted: 8487 Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is use…

sort3解题报告 —— icedream61 博客园(转载请注明出处)------------------------------------------------------------------------------------------------------------------------------------------------[题目] 给你N,而后给出N个数,每个数都是1~3中的一个.请问,要把这个数列升序排好,最少需要进行几次两两交换?[数据范围] 1<=N<…

Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from smallest to largest. For example, the sorted sequence A, B, C, D implies that A < B, B < C and C < D.…

http://poj.org/problem?id=1094 #include <cstdio> #include <cstring> #include <vector> using namespace std; int in[27],out[27]; char index[27]; bool vis[27]; int mem[27][27]; int n,m; int tlen; bool floyd(){ for(int i=0;i<n;i++){ for(i…

Sorting It All Out 时间限制:3000 ms  |  内存限制:65535 KB 难度:3   描述 An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from smallest to largest. For example, the sorted sequence A,…

题目链接: http://poj.org/problem?id=1094 题意: 给定前n个字母的大小关系,问你是否 根据前xxx个关系得到上升序列 所有关系都无法确定唯一的一个序列 第xxx个关系导致出现环 分析: 此题坑略多.... m大小没给!!这个很无语啊...数组开大点马上AC了... 无法确定序列必须最后判断. 一旦可以判断出上升序列,就不用管后面是否出现闭环了~~ where xxx is the number of relations processed at the time…

Sorting It All Out Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 26801   Accepted: 9248 Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from sm…

Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from smallest to largest. For example, the sorted sequence A, B, C, D implies that A < B, B < C and C < D.…

Sorting It All Out Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 28762   Accepted: 9964 Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from sm…

点击打开链接 Sorting It All Out Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 24544   Accepted: 8503 Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements…

Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from smallest to largest. For example, the sorted sequence A, B, C, D implies that A < B, B < C and C < D.…

<题目链接> 题目大意: 对于N个大写字母,给定它们的一些关系,要求判断出经过多少个关系之后可以确定它们的排序或者排序存在冲突,或者所有的偏序关系用上之后依旧无法确定唯一的排序. 解题分析: 因为本题在确定发生冲突和能够确定唯一排序的时候要及时输出,所以必然是每输入一对关系,就进行一次拓扑排序来判断.然后判断冲突就是判断是否存在环,判断是否能够确定唯一排序就是在不存在环的情况下,同时任何时候都不存在多个入度为0点. #include <iostream> #include <…

Sorting It All Out Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 39602   Accepted: 13944 Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from s…

题目 题目描述 给N个整数,每个整数只能是1,2,或3.现在需要对这个整数序列进行从小到大排序,问最少需要进行几次交换.N(1 <= N <= 1000) 样例输入 9 2 2 1 3 3 3 2 3 1 样例输出 4 解题思路 这个题目我没有做出来,想到一个思路,提交之后返回一个wa.后来看了一下题解,才知道自己错在什么地方.现在来回顾一下. 错误思路 我首先统计了1,2,3的个数,记为cnt1,cnt2,cnt3.然后统计在前cnt1个位置有多少个数字不是等于1的,统计在中间cnt2个位置…

That Nice Euler Circuit Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 1975   Accepted: 624 Description Little Joey invented a scrabble machine that he called Euler, after the great mathematician. In his primary school Joey heard about…

Sorting It All Out Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 38100 Accepted: 13453 Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from small…

题意:给出n个字符,m对关系,让你输出三种情况:     1.若到第k行时,能判断出唯一的拓扑序列,则输出:         Sorted sequence determined after k relations: 序列     2.若到第k行,出现环,则输出:         Inconsistency found after k relations.     3.若直到m行后,仍判断不出唯一的拓扑序列,则输出:         Sorted sequence cannot be deter…

题意:给出m对关于n个字母的小于关系,输出通过这些关系能得到的结论,如果可以排序就输出至少知道第几个关系时就可以知道顺序,从小到大输出顺序:如果产生歧义就输出在第几个关系时出现歧义,如果不能得出准确的大小关系就输出无法排序. 解法:拓扑排序.拓扑排序的大致流程就是先找入度为0的点,然后删去跟这个点相邻的边,再继续找入度为0的点,如果能一直找下去直到删掉所有边,则说明拓扑有序,否则拓扑无序.对于这道题,1.如果每次找到的入度为0的点有且只有一个且拓扑有序,则说明已有确定的顺序:2.如果找不到入度为…

World Cup Noise Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 16369   Accepted: 8095 Description Background "KO-RE-A, KO-RE-A" shout 54.000 happy football fans after their team has reached the semifinals of the FIFA World Cup in t…

                                                                                                      Recaman's Sequence Time Limit: 3000MS   Memory Limit: 60000K Total Submissions: 22363   Accepted: 9605 Description The Recaman's sequence is defined…

题意:是否唯一确定顺序,根据情况输出 #include <iostream> #include<cstdio> #include<cstring> #include<stack> using namespace std; /* run this program using the console pauser or add your own getch, system("pause") or input loop */ #define N…

来源:点击打开链接 不知道怎么回事,wa了整整一天..在绝望的时候AC了. 重点是分步处理和三种情况的判断. 1.判断是否成环,成环了直接输出错误信息. 2.然后一条边一条边的加入,进行拓扑排序,如果出度为0的点多于两个,继续判断之,如果到所有点都加入了但仍然没有判断出来,输出第三种情况. 3.以上两种情况都不存在,输出拓扑排序的路径信息. #include <iostream> #include <cstring> #include <string> using na…

(￣▽￣)" //判环:当入度为0的顶点==0时,则有环(inconsistency) //判序:当入度为0的顶点仅为1时,则能得到有序的拓扑排序,否则无序 //边输入边判断,用continue来做到:得出结果后,对后续的输入不作处理 #include<iostream> #include<cstdio> #include<cstring> #include<vector> #include<queue> using namespace…

Is It A Tree? Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 32052   Accepted: 10876 Description A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edg…

Strange Towers of Hanoi 大体意思是要求\(n\)盘4的的hanoi tower问题. 总所周知,\(n\)盘3塔有递推公式\(d[i]=dp[i-1]*2+1\) 令\(f[i]\)为4塔转移步骤. \(f[i]=min(f[i],f[k]*2+d[i-k])\) 即先以4塔以上面的\(k\),再以3塔移\(i-k\),最后以4塔移动回去. 可以推广到\(n\)盘\(m\)塔 2018.5.26…

Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from smallest to largest. For example, the sorted sequence A, B, C, D implies that A < B, B < C and C < D.…

https://vjudge.net/problem/POJ-1094 题意 对于N个大写字母,给定它们的一些关系,要求判断出经过多少个关系之后可以确定它们的排序或者排序存在冲突,或者所有的偏序关系用上之后依旧无法确定唯一的排序. 分析 拓扑排序模板题.唯一麻烦点的是判断在第几个式子就可以确定关系.由于在题目中,每个元素的关系都是严格定义的,那么当队列中存在不止一个入度为0的顶点时,可以认为未能成功排序,即还需要更多条件.当拓扑排序算法进行完后,拓扑序列的个数不够,则认为排序出现了矛盾. #in…