2014 年 3月 23 日随笔档案 - BMan、

UVA 1357 Cells

摘要：考虑一颗普通的树，DFS一遍后得到每个点的DFS前序历遍顺序值dfsid[] ,和以改点为根的子树的总结点数num[]。（比如第一组样例dfsid[]={0,1,6,8,2,3,7,9,4,5} num[]={10,5,2,2,1,3,1,1,1,1}）;那么要判断a是否为b的祖先，只要满足dfsid[a]#include#include#include#include#include#include#include#include#include#include#include#include#includeusing namespace std;typedef long long ll;t 阅读全文

posted @ 2014-03-23 23:12 BMan、阅读(271) 评论(0) 推荐(0) 编辑

UVA 610 Street Directions 双连通分量

摘要：首先找到全部双连通分量，然后对于某一个结点数大于2的连通分量，可以把全部的边改成单向的，按DFS的顺序。结点数为2的也就是一条为桥的边，必须保持双向。//#pragma comment(linker, "/STACK:1024000000,1024000000")#include#include#include#include#include#include#include#include#include#include#include#include#include#includeusing namespace std;typedef long long ll;typed 阅读全文

posted @ 2014-03-23 18:02 BMan、阅读(173) 评论(0) 推荐(0) 编辑

UVA 11504 Dominos 强连通分量

摘要：找出强连通分量，缩点后统计入度为0的结点数。//#pragma comment(linker, "/STACK:1024000000,1024000000")#include#include#include#include#include#include#include#include#include#include#include#include#include#includeusing namespace std;typedef long long ll;typedef unsigned long long ull;typedef pair pii;#define pb 阅读全文

posted @ 2014-03-23 17:48 BMan、阅读(154) 评论(0) 推荐(0) 编辑

UVA 11080 Place the Guards 二分图判定

摘要：每个连通块分别取min{白色，黑色}//#pragma comment(linker, "/STACK:1024000000,1024000000")#include#include#include#include#include#include#include#include#include#include#include#include#include#includeusing namespace std;typedef long long ll;typedef unsigned long long ull;typedef pair pii;#define pb(a) 阅读全文

posted @ 2014-03-23 17:46 BMan、阅读(170) 评论(0) 推荐(0) 编辑

UVA 11294 Wedding 2sat

摘要：训练指南上的翻译错了，只有一对新娘新郎，其他是夫妻。//#pragma comment(linker, "/STACK:1024000000,1024000000")#include#include#include#include#include#include#include#include#include#include#include#include#include#includeusing namespace std;typedef long long ll;typedef unsigned long long ull;typedef pair pii;#defin 阅读全文

posted @ 2014-03-23 17:44 BMan、阅读(152) 评论(0) 推荐(0) 编辑

UVA 10765 Doves and bombs 双连通分量

摘要： //#pragma comment(linker, "/STACK:1024000000,1024000000")#include#include#include#include#include#include#include#include#include#include#include#include#include#includeusing namespace std;typedef long long ll;typedef unsigned long long ull;typedef pair pii;#define pb(a) push(a)#define INF 阅读全文

posted @ 2014-03-23 17:42 BMan、阅读(114) 评论(0) 推荐(0) 编辑

UVA 11396 Claw Decomposition 二分图判定