http://acm.hdu.edu.cn/showproblem.php?pid=4707

Pet

Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)

Problem Description
One day, Lin Ji wake up in the morning and found that his pethamster escaped. He searched in the room but didn’t find the hamster. He tried to use some cheese to trap the hamster. He put the cheese trap in his room and waited for three days. Nothing but cockroaches was caught. He got the map of the school and foundthat there is no cyclic path and every location in the school can be reached from his room. The trap’s manual mention that the pet will always come back if it still in somewhere nearer than distance D. Your task is to help Lin Ji to find out how many possible locations the hamster may found given the map of the school. Assume that the hamster is still hiding in somewhere in the school and distance between each adjacent locations is always one distance unit.
 
Input
The input contains multiple test cases. Thefirst line is a positive integer T (0<T<=10), the number of test cases. For each test cases, the first line has two positive integer N (0<N<=100000) and D(0<D<N), separated by a single space. N is the number of locations in the school and D is the affective distance of the trap. The following N-1lines descripts the map, each has two integer x and y(0<=x,y<N), separated by a single space, meaning that x and y is adjacent in the map. Lin Ji’s room is always at location 0.
 
Output
For each test case, outputin a single line the number of possible locations in the school the hamster may be found.
 
Sample Input
1 10 2 0 1 0 2 0 3 1 4 1 5 2 6 3 7 4 8 6 9
 
Sample Output
2
 
Source
 
 

分析:

这道题要求找出超出陷阱范围的点的个数,用BFS搜索到D即可。

AC代码:

 #include<cstdio>
#include<algorithm>
#include<cstring>
#include<queue>
#include<iostream>
#include<stack>
#include<map>
#include<string>
using namespace std;
vector<int> num[];
int d[];
int depth, n;
int bfs(){
int val = ;
queue<int> q;
while(!q.empty()){
q.pop();
}
q.push();
while(!q.empty()){
int temp = q.front();
q.pop();
if(d[temp] >= depth){
return val;
}
for(int i = ; i < num[temp].size(); i++){
if(d[num[temp][i]] == 0x3f3f3f3f){
q.push(num[temp][i]);
d[num[temp][i]] = d[temp]+;
val++;
}
}
}
}
int main()
{
int tcase;
scanf("%d", &tcase);
while(tcase--){
scanf("%d%d", &n, &depth);
memset(d, 0x3f3f3f3f, sizeof(d));
for(int i = ; i < n; i++){
num[i].clear();
}
d[] = ;
for(int i = ; i < n-; i++){
int x, y;
scanf("%d%d", &x, &y);
num[x].push_back(y);
num[y].push_back(x);
}
int bumanzu = bfs();
printf("%d\n", n-bumanzu-);
}
return ;
}

队友lk又用DFS写了一个,时间上明显降低了,但是空间占用率也上去啦,,,

AC代码:

 #include<cstdio>
#include<algorithm>
#include<cstring>
#include<queue>
#include<iostream>
#include<stack>
#include<map>
#include<string>
using namespace std;
int d;
const int maxn = +;
bool vis[maxn];
vector<int> maze[maxn];
void dfs(int val, int depth){
if(depth > d)
return;
vis[val] = true;
for(int i = ; i < maze[val].size(); i++)
if(!vis[maze[val][i]])
dfs(maze[val][i], depth+);
return;
}
int main(){
int t, n, x, y;
scanf("%d", &t);
while(t--){
scanf("%d%d", &n, &d);
for(int i = ; i < n; i++)
maze[i].clear();
memset(vis, false, sizeof(vis));
for(int i = ; i < n-; i++){
scanf("%d%d", &x, &y);
maze[x].push_back(y);
maze[y].push_back(x);
}
dfs(, );
int cnt = ;
for(int i = ; i < n; i++)
if(!vis[i])
cnt++;
printf("%d\n", cnt);
}
return ;
}

hduoj 4707 Pet 2013 ACM/ICPC Asia Regional Online —— Warmup的更多相关文章

  1. hduoj 4706 Herding 2013 ACM/ICPC Asia Regional Online —— Warmup

    hduoj 4706 Children's Day 2013 ACM/ICPC Asia Regional Online —— Warmup Herding Time Limit: 2000/1000 ...

  2. hduoj 4712 Hamming Distance 2013 ACM/ICPC Asia Regional Online —— Warmup

    http://acm.hdu.edu.cn/showproblem.php?pid=4712 Hamming Distance Time Limit: 6000/3000 MS (Java/Other ...

  3. hduoj 4710 Balls Rearrangement 2013 ACM/ICPC Asia Regional Online —— Warmup

    http://acm.hdu.edu.cn/showproblem.php?pid=4710 Balls Rearrangement Time Limit: 6000/3000 MS (Java/Ot ...

  4. hduoj 4708 Rotation Lock Puzzle 2013 ACM/ICPC Asia Regional Online —— Warmup

    http://acm.hdu.edu.cn/showproblem.php?pid=4708 Rotation Lock Puzzle Time Limit: 2000/1000 MS (Java/O ...

  5. hduoj 4715 Difference Between Primes 2013 ACM/ICPC Asia Regional Online —— Warmup

    http://acm.hdu.edu.cn/showproblem.php?pid=4715 Difference Between Primes Time Limit: 2000/1000 MS (J ...

  6. hduoj 4706 Children&#39;s Day 2013 ACM/ICPC Asia Regional Online —— Warmup

    http://acm.hdu.edu.cn/showproblem.php?pid=4706 Children's Day Time Limit: 2000/1000 MS (Java/Others) ...

  7. 2013 ACM/ICPC Asia Regional Online —— Warmup

    1003 Rotation Lock Puzzle 找出每一圈中的最大值即可 代码如下: #include<iostream> #include<stdio.h> #inclu ...

  8. HDU 4714 Tree2cycle(树状DP)(2013 ACM/ICPC Asia Regional Online ―― Warmup)

    Description A tree with N nodes and N-1 edges is given. To connect or disconnect one edge, we need 1 ...

  9. HDU 4749 Parade Show 2013 ACM/ICPC Asia Regional Nanjing Online

    题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4749 题目大意:给一个原序列N,再给出一个序列M,问从N中一共可以找出多少个长度为m的序列,序列中的数 ...

随机推荐

  1. App之百度云推送

    集成SDK 下载最新的Android SDK压缩包并解压,在新建工程或已有工程中增加百度云推送功能. 我下载的是 ,里面有一个同名的文件夹,文件夹中有 导入云推送jar包和so文件: 将解压后的lib ...

  2. C 判断路径存在

    1   用   int   access(const   char   *pathname,   int   mode);   判断有没有此文件或目录 --它区别不出这是文件还是目录2   用   i ...

  3. BlueDroid介绍

    目录 1. 基本结构 2. 代码区 自从Android 4.2开始,Android开始使用自己的蓝牙协议栈BlueDroid,而不是bluez BlueDroid可分为两层: - BTE: Bluet ...

  4. HBase的数据迁移(含HDFS的数据迁移)

    1.启动两个HDFS集群 hadoop0,hadoop1,都是伪分布式的集群 2.启动hadoop3的zookeeper与hbase 注意点:需要开启yarn服务,因为distcp需要yarn. 3. ...

  5. Struts Upload上传文件

    1.Unable to find 'struts.multipart.saveDir' property setting. Defaulting to javax.servlet.context.te ...

  6. 【Android测试】【第十四节】Appium——简述

    ◆版权声明:本文出自胖喵~的博客,转载必须注明出处. 转载请注明出处:http://www.cnblogs.com/by-dream/p/5124340.html 前言 同样的,这一篇我要介绍的也是一 ...

  7. 面向对象世界里转转七(Liskov替换原则)

    前言:Liskov替换原则是关于继承机制的应用原则,是实现开放封闭原则的具体规范,违反了Liskov原则必然意味着违反了开放封闭原则.因此,有必要对面向对象的继承机制及其基本原则做以探索,来进一步了解 ...

  8. jQuery控制CSS样式

    <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <m ...

  9. Fiddler-001-抓包工具初识

    Fiddler 是一个非常简单的网络调试器,也是目前最常用的http抓包工具之一 .通过 Fiddler,我们能够能够记录客户端和服务器之间的所有 HTTP请求,即记录并检查所有你的电脑和互联网之间的 ...

  10. php中的编码问题

    转自:http://www.jb51.net/article/22501.htm php的header来定义一个php页面为utf编码或GBK编码 php页面为utf编码 header("C ...