zoukankan      html  css  js  c++  java
  • UVA

    /*
      A. 这题用到了之前做过的一些题的一些思想:
      
      例如:
      
      1. 之前做过的 UVA - 1103 Ancient Messages ( http://blog.csdn.net/mofushaohua_ln/article/details/78162277 )
      
      两题十分相似之处在于,都是连通块问题,且都要在最外围,加上一圈“空气”,以使得所有空气格子得以连通
      
      2. 之前做过的 UVA - 221 Urban Elevations ( http://blog.csdn.net/mofushaohua_ln/article/details/77799245 )
      
      两题都用到了坐标离散化的思想,来减少所需单元格的数目
      不过需要注意的是,floodfill时,运用离散化后的坐标来处理连通块,是没有问题的。但是,在统计表面积和体积时,一定要用原始坐标,否则必定WA
      
      B. 该题主要思路见小白书 P172
      不考虑雕塑本身,而考虑“空气”,在网格周围加一圈“空气”(目的时为了让所有空气格子连通),然后做一次 floodfill,即可得到空气的 “内表面积” 和体积,这个表面积就是雕塑的外表面积,雕塑体积等于总体积减去空气体积
      
      floodfill 时直接使用离散化后的新坐标,但在统计表面积和体积时则需要使用原始坐标
      
    */


    #include <iostream>
    #include <algorithm>
    #include <queue>
    #include <cstring>
    #define rep(i, n) for ( int i = 0; i < (n); i++ )
    using namespace std;
    
    const int N = 50 + 5;
    const int C = 1e3 + 1;
    
    int n, x0[N], y0[N], z0[N], x1[N], y1[N], z1[N];
    
    // 离散化后的坐标
    int nx, ny, nz;
    int xs[N * 2], ys[N * 2], zs[N * 2];
    
    // 种子填充
    const int dx[] = { 1, -1, 0, 0, 0, 0 };
    const int dy[] = { 0, 0, 1, -1, 0, 0 };
    const int dz[] = { 0, 0, 0, 0, 1, -1 };
    int color[N * 2][N * 2][N * 2];
    
    struct Cell
    {
    	int x, y, z;
    	Cell (int x = 0, int y = 0, int z = 0) : x(x), y(y), z(z)
    	{
    	}
    	
    	bool valid() const
    	{
    		return x >= 0 && x < nx - 1 && y >= 0 && y < ny - 1 && z >= 0 && z < nz - 1;
    	}
    	
    	bool solid() const
    	{
    		return color[x][y][z] == 1; // solid
    	}
    	
    	bool getVis() const
    	{
    		return color[x][y][z] == 2; // visited
    	}
    	
    	void setVis() const
    	{
    		color[x][y][z] = 2;
    	}
    	
    	Cell neighbour (int dir) const
    	{
    		return Cell( x + dx[dir], y + dy[dir], z + dz[dir] );
    	}
    	
    	int getVolume() const
    	{
    		return ( xs[x + 1] - xs[x] ) * ( ys[y + 1] - ys[y] ) * ( zs[z + 1] - zs[z] );
    	}
    	
    	int getArea(int dir) const
    	{
    		if (dx[dir]) return ( ys[y + 1] - ys[y] ) * ( zs[z + 1] - zs[z] );
    		if (dy[dir]) return ( xs[x + 1] - xs[x] ) * ( zs[z + 1] - zs[z] );
    		return ( xs[x + 1] - xs[x] ) * ( ys[y + 1] - ys[y] );
    	}
    };
    
    void discretize (int* x, int& n) // 坐标离散化
    {
    	sort(x, x + n);
    	n = unique(x, x + n) - x;
    }
    
    int ID (int *x, int n, int x0)
    {
    	return lower_bound(x, x + n, x0) - x;
    }
    
    void FloodFill(int &v, int &s)
    {
    	v = s = 0;
    	Cell c;
    	c.setVis();
    	queue<Cell> q;
    	q.push(c);
    	
    	while (!q.empty())
    	{
    		Cell c = q.front();
    		q.pop();
    		v += c.getVolume();
    		
    		rep(i, 6)
    		{
    			Cell c2 = c.neighbour(i);
    			if (!c2.valid()) continue;
    			if (c2.solid()) s += c.getArea(i);
    			else if (!c2.getVis())
    			{
    				c2.setVis();
    				q.push(c2);
    			}
    		}	
    	}
    	v = C * C * C- v;
    }
    
    int main()
    {
    	int t;
    	cin >> t;
    	while (t--)
    	{
    		nx = ny = nz = 2;
    		xs[0] = ys[0] = zs[0] = 0;
    		xs[1] = ys[1] = zs[1] = C;
    		
    		cin >> n;
    		rep(i, n)
    		{
    			cin >> x0[i] >> y0[i] >> z0[i] >> x1[i] >> y1[i] >> z1[i];
    			
    			x1[i] += x0[i]; y1[i] += y0[i]; z1[i] += z0[i];
    			xs[nx++] = x0[i]; xs[nx++] = x1[i];
    			ys[ny++] = y0[i]; ys[ny++] = y1[i];
    			zs[nz++] = z0[i]; zs[nz++] = z1[i];
    		}
    		discretize(xs, nx);
    		discretize(ys, ny);
    		discretize(zs, nz);
    		
    		// paint
    		memset( color, 0, sizeof(color) );
    		
    		rep(i, n)
    		{
    			int X1 = ID ( xs, nx, x0[i] ), X2 = ID ( xs, nx, x1[i] );
    			int Y1 = ID ( ys, ny, y0[i] ), Y2 = ID ( ys, ny, y1[i] );
    			int Z1 = ID ( zs, nz, z0[i] ), Z2 = ID ( zs, nz, z1[i] );
    			
    			for (int X = X1; X < X2; X++)
    				for (int Y = Y1; Y < Y2; Y++)
    					for (int Z = Z1; Z < Z2; Z++)
    					{
    						color[X][Y][Z] = 1;
    					}
    		}
    		
    		int v, s;
    		FloodFill(v, s);
    		cout << s << " " << v << endl;	
    	}
    }

  • 相关阅读:
    ASP.Net核心对象HttpRequest
    HTTP状态码和常用对照表
    Http协议之Get和Post的区别
    Http协议之Request和Response
    HTTP协议的几个概念
    表单内容提交到数据库案例
    关于表单提交的规则
    HttpHandler简介
    DHCP(五)
    DHCP(四)
  • 原文地址:https://www.cnblogs.com/mofushaohua/p/7789390.html
Copyright © 2011-2022 走看看