湖南省第六届省赛题 Biggest Number (dfs+bfs,好题)
Biggest Number
- 描述
-
You have a maze with obstacles and non-zero digits in it:

You can start from any square, walk in the
maze, and finally stop at some square. Each step, you
may only walk into one of the four neighbouring squares (up, down,
left, right) and you cannot walk into
obstacles or walk into a square more
than once. When you finish, you can get a number by writing down the digits you
encounter in the same order as you meet them. For example, you can get numbers 9784, 4832145 etc. The biggest
number you can get is 791452384, shown in the picture above.Your task is to find the biggest number you can
get.
- 输入
- There will be at most 25 test cases. Each test begins with
two integers R and C (2<=R,C<=15, R*C<=30), the number of rows
and columns of the maze. The next R rows represent the maze. Each line
contains exactly C characters (without leading or trailing spaces), each
of them will be either '#' or one of the nine non-zero digits. There
will be at least one non-obstacle squares (i.e. squares with a non-zero
digit in it) in the maze. The input is terminated by a test case with
R=C=0, you should not process it. - 输出
- For each test case, print the biggest number you can find, on a single line.
- 样例输入
-
3 7
##9784#
##123##
##45###
0 0 - 样例输出
-
791452384
- 来源
- 湖南省第六届大学生计算机程序设计竞赛
- aaarticlea/png;base64,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" alt="" />
- 题解:非常巧妙地剪枝想法,每次DFS一个位置的时候,处理它能够到达的所有的点,我们假设这些点都是沿着它可以到达的,如果当前点的数量+当前的搜索长度<已经得到的最优解的长度,那么这段必定是可以减掉的,因为无论怎么走都达不到最优解的长度了.还有一种就是能够达到点的数量+当前的搜索长度 = 已经得到的最优解的长度,那么我们只要在当前搜索的解后面添一个最大的数字 '9',如果这样的结果字典序还比已经得到的最优解的字典序小,那么也没有搜索下去的必要了,直接剪枝,这里的BFS按照我的理解就相当于一个估价函数,让结果一直往正确的方向走.很厉害的题目。
- 还有一个小插曲:就是关于手动队列和STL自带队列,自带队列在某些时候要慎用,比如说这个题,BFS调用的次数比较多,给大家看一下两者的时间。
-
aaarticlea/png;base64,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" alt="" />(手动队列)aaarticlea/png;base64,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" alt="" />(STL自带)一直超时找不到原因,改成手动队列跑得飞快,还有就是 string 类型也要谨慎使用,这些STL自带功能会消耗时间
#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <queue>
using namespace std;
const int N = ;
int n,m,MAX;
char mp[N][N];
bool flag[N][N];
bool vis[N][N];
int dir[][] = {{,},{-,},{,-},{,}};
struct Node{
int x,y;
};
char res[N],ans[N],ans1[N];
bool check(int x,int y){
if(x<||x>n||y<||y>m||mp[x][y]=='#') return false;
return true;
}
Node q[N * N];
int bfs(int x,int y){
memset(flag,,sizeof(flag));
int head = , tail = ,ret = ;;
q[tail].x = x; ///手动队列非常快
q[tail++].y = y;
flag[x][y] = true;
while(head!= tail){
int nowx = q[head].x;
int nowy = q[head++].y;
for(int i=;i<;i++){
int nextx = nowx+dir[i][];
int nexty = nowy+dir[i][];
if(!check(nextx,nexty)||flag[nextx][nexty]||vis[nextx][nexty]) continue;
ret++;
flag[nextx][nexty] = true;
q[tail].x = nextx;
q[tail++].y = nexty;
}
}
return ret;
} void dfs(int x,int y,int step){
if(step>MAX||step==MAX&&strcmp(ans,res)>){
MAX = step;
strcpy(res,ans);
}
int GO = bfs(x,y); ///预处理最好的情况,所有点都可达
strcpy(ans1,ans);
ans1[step] = '';
if(GO+step<MAX||GO+step==MAX&&strcmp(ans1,res)<) return; ///剪枝,(x,y)能够走的距离 < 答案
for(int i=0;i<4;i++){
int nextx = x+dir[i][0];
int nexty = y+dir[i][];
if(!check(nextx,nexty)||vis[nextx][nexty]) continue;
vis[nextx][nexty] = true;
ans[step] = mp[nextx][nexty];
dfs(nextx,nexty,step+);
ans[step] = ;
vis[nextx][nexty] = false;
}
}
int main()
{
freopen("f.in","r",stdin);
freopen("f.txt","w",stdout);
while(scanf("%d%d",&n,&m)!=EOF,n+m){
int tot = ;
for(int i=;i<=n;i++){
scanf("%s",mp[i]+);
for(int j=;j<=m;j++){
if(mp[i][j]!='#') tot++;
}
}
memset(res,,sizeof(res));
MAX = -;
for(int i=;i<=n;i++){
for(int j=;j<=m;j++){
if(mp[i][j]=='#'||MAX==tot&&mp[i][j]<res[]) continue;
memset(vis,false,sizeof(vis));
ans[] = mp[i][j];
vis[i][j] = true;
dfs(i,j,);
}
}
printf("%s\n",res);
}
return ;
}
/**
5 6
245356
342534
534635
423535
324345
*/
湖南省第六届省赛题 Biggest Number (dfs+bfs,好题)的更多相关文章
- UVA - 11882 Biggest Number(dfs+bfs+强剪枝)
题目大意:给出一个方格矩阵,矩阵中有数字0~9,任选一个格子为起点,将走过的数字连起来构成一个数,找出最大的那个数,每个格子只能走一次. 题目分析:DFS.剪枝方案:在当前的处境下,找出所有还能到达的 ...
- 湖南省第六届大学生程序设计大赛原题 F Biggest Number (UVA1182)
Biggest Number http://acm.hust.edu.cn/vjudge/contest/view.action?cid=30851#problem/F 解题思路:DFS(检索)+BF ...
- 湖南省第6届程序大赛第6题 Biggest Number
Problem F Biggest Number You have a maze with obstacles and non-zero digits in it: You can start fro ...
- 山东省第六届省赛 H题:Square Number
Description In mathematics, a square number is an integer that is the square of an integer. In other ...
- 蓝桥杯第六届省赛 手链样式 STL
小明有3颗红珊瑚,4颗白珊瑚,5颗黄玛瑙.他想用它们串成一圈作为手链,送给女朋友.现在小明想知道:如果考虑手链可以随意转动或翻转,一共可以有多少不同的组合样式呢? 分析:这个题首先一定要理解题意,转动 ...
- 算法笔记_119:蓝桥杯第六届省赛(Java语言A组)试题解答
目录 1 熊怪吃核桃 2 星系炸弹 3 九数分三组 4 循环节长度 5 打印菱形 6 加法变乘法 7 牌型种数 8 移动距离 9 垒骰子 10 灾后重建 前言:以下试题解答代码部分仅供参考,若有 ...
- 算法笔记_120:蓝桥杯第六届省赛(Java语言B组部分习题)试题解答
目录 1 三角形面积 2 立方变自身 3 三羊献瑞 4 九数组分数 5 饮料换购 6 生命之树 前言:以下试题解答代码部分仅供参考,若有不当之处,还请路过的同学提醒一下~ 1 三角形面积 三角形 ...
- 地铁 Dijkstra(优先队列优化) 湖南省第12届省赛
传送门:地铁 思路:拆点,最短路:拆点比较复杂,所以对边进行最短路,spfa会tle,所以改用Dijkstra(优先队列优化) 模板 /******************************** ...
- FZOJ--2221-- RunningMan 福建第六届省赛
题目链接:http://acm.hust.edu.cn/vjudge/contest/127149#problem/J 题目大意: 因为总共就分三个队,因为两个队都要选取最优的策略,不论B队咋放,要使 ...
随机推荐
- redis的简单事务
Redis对事务的支持目前还比较简单.Redis只能保证一个client发起的事务中的命令可以连续的执行,而中间不会插入其他client的命令.当一个client在一个连接中发出multi命令时,这个 ...
- apue.3e 的安装 (基于ubuntu12.0.4)
本菜刚刚学习UNIX下高级编程,无奈搭建本书编程环境时遇到不少问题.幸好网上有各种大神的解决办法让我最终解决了问题.在这里感谢为LINUX开源操作系统奋斗的大神. 不过话说回来,网上大都是针对UNIX ...
- bzoj1969: [Ahoi2005]LANE 航线规划(树链剖分)
只有删边,想到时间倒流. 倒着加边,因为保证图连通,所以一开始一定至少是一棵树.我们先建一棵树出来,对于每一条非树边,两个端点在树上这段路径的边就不会变成关键边了,所以将它们对答案的贡献删去,那么直接 ...
- 网络编程----socketserver多并发实现、FTP上传多并发、udp协议套接字多并发
一.socketserver多并发 基于tcp的套接字,关键就是两个循环,一个 ...
- oracle中 trunc(),round(),ceil(),floor的使用
oracle中 trunc(),round(),ceil(),floor的使用 原文: http://www.2cto.com/database/201310/248336.html 1.round函 ...
- 电商网站中价格的精确计算(使用BigDecimal进行精确运算(实现加减乘除运算))
使用BigDecimal的String的构造器.商业计算中,使用bigdecimal的String构造器,一定要用. 重要的事情说三遍: 商业计算中,使用bigdecimal的String构造器! 商 ...
- git clone 指定分支的内容
使用Git下载指定分支命令为:git clone -b 分支名仓库地址 使用Git下载v.2.8.1分支代码,使用命令:git clone -b v2.8.1 https://git.oschina. ...
- Android的静默安装
原文 Android的静默安装似乎是一个很有趣很诱人的东西,但是,用普通做法,如果手机没有root权限的话,似乎很难实现静默安装,因为Android并不提供显示的Intent调用,一般是通过以下方式安 ...
- Eclipse自动代码补全
Windows——>Preferences——>Java-->Editor-->Content Asist, 在Auto activation triggers for Jav ...
- 去除UITableView多余的seperator
UIView *v = [[UIView alloc] initWithFrame:CGRectZero]; [tableView setTableFooterView:v]; [v release] ...