Sorting It All Out poj-1094 题目大意:给出一些字符串之间的大小关系,问能否得到一个唯一的字符串序列,满足权值随下标递增. 注释:最多26个字母,均为大写. 想法:显然,很容易想到用toposort处理,对于每一个刚刚读入的大小关系,我们对进行一次拓扑排序,由于点数最多是26,所以总时间复杂度是$10^2$的.然后通过题面,可以发现第一个和第三个判定依据是可以中途退出的,而第二个条件是必须最后才可以判断的.但是由于poj的多组数据,我们必须要将所有的数据都读入完毕才能达…
题目链接:http://poj.org/problem?id=1094 Sorting It All Out Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 35468 Accepted: 12458 Description An ascending sorted sequence of distinct values is one in which some form of a less-than operator…
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 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…
Sorting It All Out Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 40012 Accepted: 14072 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 fr…
Sorting It All Out Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 29984 Accepted: 10373 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…
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.…
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…
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. in this pro…
一.什么是拓扑排序 在图论中,拓扑排序(Topological Sorting)是一个有向无环图(DAG, Directed Acyclic Graph)的所有顶点的线性序列.且该序列必须满足下面两个条件: 每个顶点出现且只出现一次. 若存在一条从顶点 A 到顶点 B 的路径,那么在序列中顶点 A 出现在顶点 B 的前面. 有向无环图(DAG)才有拓扑排序,非DAG图没有拓扑排序一说. 例如,下面这个图: 它是一个 DAG 图,那么如何写出它的拓扑排序呢?这里说一种比较常用的方法: 从 DAG…
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…
比较模板的topological-sort题,关键在于每个元素都严格存在唯一的大小关系,而一般的拓扑排序只给出一个可能解,这就需要每趟排序的过程中监视它是不是总坚持一条唯一的路径. 算法导论里面的拓扑排序运用的是DFS the DAG,记录每个顶点的进入时间和离开时间,根据其先后插入单链表的做法.而我认为一种方法是更直观的,就是维护一个入度为0的顶点集合(我用的队列其实没差),每次对其中一个加入结果序列——同时删除它的所有出边——更新其他点的入度的做法,在我的算法数据结构实现模板里有正确实现ht…
Sorting It All Out Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 29539 Accepted: 10233 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…
传送门 DZY Loves Topological Sorting Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 221 Accepted Submission(s): 52 Problem Description A topological sort or topological ordering of a directed…
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…
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…
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. in this pro…
