搜索 F
来源:互联网 发布:php怎么找工作 编辑:程序博客网 时间:2024/06/05 16:01
Description
The digitized slides will be represented by a rectangular grid of periods, '.', indicating empty space, and the capital letter 'X', indicating part of an object. Simple examples are
XX Grid 1 .XXX Grid 2 XX .XXX .XXX ...X ..X. X...
An X in a grid square indicates that the entire grid square, including its boundaries, lies in some object. The X in the center of the grid below is adjacent to the X in any of the 8 positions around it. The grid squares for any two adjacent X's overlap on an edge or corner, so they are connected.
XXX XXX Central X and adjacent X's XXX
An object consists of the grid squares of all X's that can be linked to one another through a sequence of adjacent X's. In Grid 1, the whole grid is filled by one object. In Grid 2 there are two objects. One object contains only the lower left grid square. The remaining X's belong to the other object.
The technician will always click on an X, selecting the object containing that X. The coordinates of the click are recorded. Rows and columns are numbered starting from 1 in the upper left hand corner. The technician could select the object in Grid 1 by clicking on row 2 and column 2. The larger object in Grid 2 could be selected by clicking on row 2, column 3. The click could not be on row 4, column 3.
One useful statistic is the perimeter of the object. Assume each X corresponds to a square one unit on each side. Hence the object in Grid 1 has perimeter 8 (2 on each of four sides). The perimeter for the larger object in Grid 2 is illustrated in the figure at the left. The length is 18.
Objects will not contain any totally enclosed holes, so the leftmost grid patterns shown below could NOT appear. The variations on the right could appear:
Impossible Possible XXXX XXXX XXXX XXXX X..X XXXX X... X... XX.X XXXX XX.X XX.X XXXX XXXX XXXX XX.X ..... ..... ..... ..... ..X.. ..X.. ..X.. ..X.. .X.X. .XXX. .X... ..... ..X.. ..X.. ..X.. ..X.. ..... ..... ..... .....
Input
The end of the input is indicated by a line containing four zeros. The numbers on any one line are separated by blanks. The grid rows contain no blanks.
Output
Sample Input
2 2 2 2XXXX6 4 2 3.XXX.XXX.XXX...X..X.X...5 6 1 3.XXXX.X....X..XX.X.X...X..XXX.7 7 2 6XXXXXXXXX...XXX..X..XX..X...X..X..XX.....XXXXXXXX7 7 4 4XXXXXXXXX...XXX..X..XX..X...X..X..XX.....XXXXXXXX0 0 0 0
Sample Output
81840488
这道题基本题意为让你从所确定的点上下左右左上右上左下右下八个方向相连的区域的周长。
这个题为一道DFS题,可以将所给区域的外层都初始化为点号,当向上下左右四个方向搜索到点号时计数器加一,即为一个边缘,当深搜结束时,输出计数器的大小即可。
源代码如下:
#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int const MAX = 21;
char map[MAX][MAX];
bool vis[MAX][MAX];
int n, m, x, y;
int dirx[8] = {1, -1, 0, 0, 1, -1, 1, -1};
int diry[8] = {0, 0, 1, -1, 1, -1, -1, 1};
int ans;
int DFS(int x, int y)
{
vis[x][y] = true;
for(int i = 0; i < 4; i++)
if(map[x + dirx[i]][y + diry[i]] == '.')
ans++;
for(int i = 0; i < 8; i++)
{
int xx = x + dirx[i];
int yy = y + diry[i];
if(xx <= n && xx >= 1 && yy <= m && yy >= 1 && !vis[xx][yy] && map[xx][yy] == 'X')
DFS(xx, yy);
}
return ans;
}
int main()
{
while(scanf("%d %d %d %d", &n, &m, &x, &y) != EOF && n + m)
{
ans = 0;
memset(vis, false, sizeof(vis));
for(int i = 1; i <= n; i++)
scanf("%s", map[i] + 1);
for(int i = 0; i <= n + 1; i++)
map[i][0] = map[i][m + 1] = '.';
for(int i = 0; i <= n + 1; i++)
map[0][i] = map[n + 1][i] = '.';
DFS(x, y);
printf("%d\n", ans);
}
}
- 搜索 F
- 搜索-F
- 搜索-F
- 搜索比赛F题
- 搜索专题 F
- 搜索 F题
- 搜索练习题F-06
- kuangbin 简单搜索 F题
- eclipse搜索使用_Ctrl+F/H
- VS2005 Ctrl+F无法弹出搜索对话框
- vs shfit+ctrl+f 全局搜索失
- 【搜索入门专题1】hdu1253 【BFS】 F
- 记忆化搜索--剪枝 vijos Function(Function(F...
- Jquery完成CTRL+F的页面搜索功能
- U-boot命令(Ctrl + F 搜索更快哦)
- JS屏幕搜索,实现CTRL + F的效果
- F-SLIKAR 多校联合第七场 搜索问题
- 百度搜索结果页面的参数 形式(f)
- UnicodeDecodeError: ‘ascii’ codec……not in range(128)
- PHP如何查询MySQL数据页面并输出内容到页面,并另存为CSV或EXCEL文件
- https协议和http的区别。
- 【indeed】C
- DOM
- 搜索 F
- 进程学习10--syslog记录调试信息
- 2017年5月31日网站日志调研
- 安装beautifulsoup4 时出现 ImportError: cannot import name 'beautifulsoup'
- bzoj 1477 青蛙的约会 拓展欧几里得(详细解析)
- 用户代理与IP代理爬取糗事百科
- [bzoj4928][SDOI省队集训2017]dierti
- 解决继承SwitchPreference后丢失动画的问题
- 【编程题】调整红白蓝三色