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…

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…

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.…

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 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…

题目大意:就是给定一组字母的大小关系判断他们是否能组成唯一的拓扑序列. 是典型的拓扑排序,但输出格式上确有三种形式: 1.该字母序列有序,并依次输出: 2.判断该序列是否唯一: 3.该序列字母次序之间是否有矛盾,即是否有环存在: 而这三种形式的判断是有顺序的:先判断(3)是否有环,再判断是否有序(1),最后才能判断是否能得出结果(2).注意:对于(2)必须遍历完整个图,而(1)和(3)一旦得出结果,对后面的输入就不用做处理了. #include<cstdio> #include<cstr…

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…

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…