SGU 520 Fire in the Country(博弈+搜索)
Description
To save the country, a small fire robot was left on its territory. He managed to extinguish fire in all cities except the capital before running out of liquid. The robot can't extinguish fire anymore, so the country is still in danger at the moment.
There are n cities in the country connected by m two-way roads. Each road connects a pair of cities. There is at most one road between any pair of cities. The cities are numbered from 1 to n, with capital having the number 1.
The fire spreads very quickly. On the very first day only the capital is on fire. But with every subsequent day, the fire devours all the cities connected by a road with the cities that are already on fire. Once the fire gets to a certain city, this city will continue to stay on fire till the very end.
The robot can't extinguish the fire anymore and there are no other means of firefighting left in the country, so obviously the country is going to be burned down to the ground. And you don't have to be a hero and save it. The key thing is that the robot is going to be destroyed by fire as well, and you need to figure out who will actually pay for the loss of government property.
Two pilots, Nikolay and Vladimir, are on Earth's natural satellite. They alternately take turns controlling the robot. The pilots alternate each day. Robot's speed is equal to the speed of fire, so the robot can get to the neighboring city in a day. Each pilot does not want the robot to be destroyed on his turn. For such a valuable loss they will have to pay a huge fee to the government.
On the first day the robot is located in the capital. Nikolay controls the robot on the first day. Thus, Nikolay controls the robot on the days with odd numbers, and Vladimir controls it on the days with even numbers. Taking turn, a pilot has to move the robot from the current city to any city connected by a road with the current one. If a pilot moves the robot to a city which is on fire, the robot is destroyed.
You task is to figure out who will pay the fine for the destroyed robot, assuming both pilots act optimally.
Input
Output
Nikolay
" — if it is Nikolay, "
Vladimir
" — if it is Vladimir).
#include <cstdio>
#include <cstring>
#include <queue>
using namespace std; const int MAXN = ;
const int MAXE = ; int n, m, f, ecnt;
int head[MAXN], dis[MAXN];
int to[MAXE], next[MAXE]; void add_edge(int u, int v) {
to[ecnt] = v; next[ecnt] = head[u]; head[u] = ecnt++;
to[ecnt] = u; next[ecnt] = head[v]; head[v] = ecnt++;
} void bfs() {
queue<int> que; que.push();
dis[] = ;
while(!que.empty()) {
int u = que.front(); que.pop();
for(int p = head[u]; p; p = next[p]) {
int &v = to[p];
if(!dis[v]) {
dis[v] = dis[u] + ;
que.push(v);
}
}
}
} int win[MAXN]; int dfs(int u) {
if(win[u] != -) return win[u];
for(int p = head[u]; p; p = next[p]) {
int &v = to[p];
if(dis[v] == dis[u] + ) {
if(dis[u] & ) {if(dfs(v)) return win[u] = ;}
else if(!dfs(v)) return win[u] = ;
}
}
return win[u] = !(dis[u] & );
} int main() {
scanf("%d%d", &n, &m);
ecnt = ;
while(m--) {
int u, v;
scanf("%d%d", &u, &v);
add_edge(u, v);
}
bfs();
memset(win, -, sizeof(win));
if(dfs()) puts("Vladimir");
else puts("Nikolay");
}
SGU 520 Fire in the Country(博弈+搜索)的更多相关文章
- HDU 5723 Abandoned country 最小生成树+搜索
Abandoned country Time Limit: 8000/4000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others ...
- 【迭代博弈+搜索+剪枝】poj-1568--Find the Winning Move
poj 1568:Find the Winning Move [迭代博弈+搜索+剪枝] 题面省略... Input The input contains one or more test cas ...
- Gym 101246D Fire in the Country(dfs求SG函数)
http://codeforces.com/gym/101246/problem/D 题意: 给定一个无向有环图,大火从1点开始,每个时间点与它相邻的点也将会着火,现在有两个人轮流操作机器人,机器人从 ...
- D - Stone Division HackerRank - stone-division (博弈+搜索)
题目链接:https://cn.vjudge.net/problem/HackerRank-stone-division 题目大意:给你n,m,然后是m个数.每一次你可以选择一个a[i],如果能被n整 ...
- B. Sleepy Game 博弈搜索
题意:给一个有向图和起点,然后只有一名选手,这名选手可以随意挪动棋子,最终不能动的时候走过的边为奇数边为Win并输出路径,否则如果有环输出Draw,否则输出Lose; 题目链接 知道状态数最多只有n* ...
- 极小极大搜索方法、负值最大算法和Alpha-Beta搜索方法
1. 极小极大搜索方法 一般应用在博弈搜索中,比如:围棋,五子棋,象棋等.结果有三种可能:胜利.失败和平局.暴力搜索,如果想通过暴力搜索,把最终的结果得到的话,搜索树的深度太大了,机器不能满足, ...
- 转:极小极大搜索方法、负值最大算法和Alpha-Beta搜索方法
转自:极小极大搜索方法.负值最大算法和Alpha-Beta搜索方法 1. 极小极大搜索方法 一般应用在博弈搜索中,比如:围棋,五子棋,象棋等.结果有三种可能:胜利.失败和平局.暴力搜索,如果想通 ...
- shodan搜索
扫描一切联网的设备 www.shodan.io 一.ip 直接搜索:123.123.123.123 二.搜索服务 http http country:"DE" 指定搜索德国 htt ...
- Shodan新手入坑指南
*本文原创作者:xiaix,本文属FreeBuf原创奖励计划,未经许可禁止转载 亲们~黑五 Shodan Membership 只要5刀,你剁手了没? 什么是 Shodan? 首先,Shodan 是一 ...
随机推荐
- 第一个electron
1 开发环境:node环境 2 下载electron:npm install electron --save-dev 3 package.json配置如下: { "name": & ...
- hdu_4336_Card Collector
In your childhood, do you crazy for collecting the beautiful cards in the snacks? They said that, fo ...
- 【mongdb主从复制和同步】
主从同步: Master: Slave: 副本集: #在卷本中加任意主机 #登录从 #登录主 #同步日志 #仲裁: 向集群中添加主机成为仲裁 #查看集群里的成员角色参数:
- table表单制作个人简历
应用table表单,编程个人简历表单,同时运用了跨行rowspan和跨列colspan. <!DOCTYPE html> <html> <head> <met ...
- PHP基础1--环境搭建
主要: 环境搭建 站点配置 环境搭建 web运行流程: 1. 浏览器输入地址,回车(发送请求) 2. 根据规则找到对应web服务器.规则如下: 首先在本机hosts文件中找对应IP hosts位置: ...
- hadoop生态搭建(3节点)-16.elk配置
# ==================================================================ELK环境准备 # 修改文件限制 # * 代表Linux所有用户 ...
- Spark_安装配置_运行模式
一.Spark支持的安装模式: 1.伪分布式(一台机器即可) 2.全分布式(至少需要3台机器) 二.Spark的安装配置 1.准备工作 安装Linux和JDK1.8 配置Linux:关闭防火墙.主机名 ...
- linux 搭建ss
因为收藏的各种教程被xx,所以决定自己写 第一步.安装ss sudo pip install shadowsocks 第二步.配置IP.端口.密码.加密方式 vi /etc/shadowsocks.j ...
- 棋盘覆盖(我们学校自己的UOJ上的变形题)
题目 #include<iostream> #include<cstring> #include<cstdlib> #include<cstdio> # ...
- 北京Uber优步司机奖励政策(12月8日)
滴快车单单2.5倍,注册地址:http://www.udache.com/ 如何注册Uber司机(全国版最新最详细注册流程)/月入2万/不用抢单:http://www.cnblogs.com/mfry ...