题目 John is the only priest in his town. September 1st is the John's busiest day in a year because there is an old legend in the town that the couple who get married on that day will be forever blessed by the God of Love. This year N couples plan to g…

Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 11049   Accepted: 3767   Special Judge Description John is the only priest in his town. September 1st is the John's busiest day in a year because there is an old legend in the town that the…

2-SAT 输出可行解 找可行解的方案就是: 根据第一次建的图建一个反图..然后求逆拓扑排序,建反图的原因是保持冲突的两个事件肯定会被染成不同的颜色 求逆拓扑排序的原因也是为了对图染的色不会发生冲突,输出可行解就是遍历一次逆拓扑排序时染成的颜色,输出同一组颜色的解就是其中的一组可行解.   代码: #include <stdio.h> #include <iostream> #include <string.h> #include <stack> #incl…

2-SAT. 读入用了黄学长的快速读入,在此膜拜感谢. 把每对时间当作俩个点.如果有交叉代表相互矛盾. 然后tarjan缩点,这样就能得出当前的2-SAT问题是否有解. 如果有解,跑拓扑排序就能找出一个特定的解. #include<cstdio> #include<algorithm> #include<cstring> using namespace std; + ; + ; inline int read() //by hzwer 实在太好了..我用下..跪谢. {…

这是一道裸的2-Sat,只要考虑矛盾条件的判断就好了. 矛盾判断: 对于婚礼现场 x 和 y,x 的第一段可以和 y 的第一段或者第二段矛盾,同理,x 的第二段可以和 y 的第一段或者第二段矛盾,条件是 x 的 1或2 段与 y 的 1或2 段有重合,那么选了 x 某一段就不能选择其矛盾的那一段,那就只能选择 y 中的另一段,建立一条 x (u)-> y ( v的对立 ),同理,x (u的对立)<- y ( v ) . 真的,2-sat千万不要用邻接链表!!!卡死卡死卡死!!!稠密图!!!不要…

转换成2-SAT模型,建边是如果时间(i,j)冲突就连边(i,j'),其他同理 tarjan缩点,判可行性 返图拓扑,输出方案 #include<iostream> #include<cstdio> #include<cstring> #include<vector> #include<queue> using namespace std; const int N=5005; int n,a[N],b[N],h[N],cnt,dfn[N],low…

题意简介 有一个司仪,要主持n场婚礼,给出婚礼的起始时间和终止时间,每个婚礼需要超过一半的时间做为仪式,并且仪式不能终止.问说司仪能否主持n场婚礼. 输入格式 多组数据,每组数据输入一个\(N\)(\(N\)<=100000),接下来N行,每行输入\(Si\),\(Ti\)两个数,当输入\(n=0\)时输入结束 输出格式 每行对应每组数据,用"YES"或"NO"代表能否主持完n场婚礼 算法分析 一眼贪心,要求主持完全部婚礼,每个婚礼主持时间为 \((Ti-Si…

题目 John is the only priest in his town. September 1st is the John's busiest day in a year because there is an old legend in the town that the couple who get married on that day will be forever blessed by the God of Love. This year N couples plan to g…

POJ 3683 Priest John's Busiest Day / OpenJ_Bailian 3788 Priest John's Busiest Day(2-sat问题) Description John is the only priest in his town. September 1st is the John's busiest day in a year because there is an old legend in the town that the couple w…

Priest John's Busiest Day   Description John is the only priest in his town. September 1st is the John's busiest day in a year because there is an old legend in the town that the couple who get married on that day will be forever blessed by the God o…