<rt id="bn8ez"></rt>
<label id="bn8ez"></label>
  • 

    • <span id="bn8ez"></span>
    

    <label id="bn8ez"><meter id="bn8ez"></meter></label>
    

    
    

    




    







												


        


    

    
	
	


    
	
    
		將Java進行到底
    
		將Java進行到底
	
    

    
    		
	

    

    


    
	
		
    
			


    
posts - 15, 
comments - 66, 
trackbacks - 0


    
	

    

    
	
					


    
	
	
    


    


    Problem Statement 
    

    
     
A simple line drawing program uses a blank 20 x 20 pixel canvas and a directional cursor that starts at the upper left corner pointing straight down. The upper left corner of the canvas is at (0, 0) and the lower right corner is at (19, 19). You are given a String[], commands, each element of which contains one of two possible commands. A command of the form "FORWARD x" means that the cursor should move forward by x pixels. Each pixel on its path, including the start and end points, is painted black. The only other command is "LEFT", which means that the cursor should change its direction by 90 degrees counterclockwise. So, if the cursor is initially pointing straight down and it receives a single "LEFT" command, it will end up pointing straight to the right. Execute all the commands in order and return the resulting 20 x 20 pixel canvas as a String[] where character j of element i represents the pixel at (i, j). Black pixels should be represented as uppercase 'X' characters and blank pixels should be represented as '.' characters. 
    

    


    Definition 
    

    
     


    


    
Class: 
DrawLines 
    

    
Method: 
execute 
    

    
Parameters: 
String[] 
    

    
Returns: 
String[] 
    

    
Method signature: 
String[] execute(String[] commands) 
    

    
(be sure your method is public) 
    

    
     
    

    

    

    


    Notes 
    

    
- 
The cursor only paints the canvas if it moves (see example 1). 
    

    


    Constraints 
    

    
- 
commands will contain between 1 and 50 elements, inclusive. 
    

    
- 
Each element of commands will be formatted as either "LEFT" or "FORWARD x" (quotes for clarity only), where x is an integer between 1 and 19, inclusive, with no extra leading zeros. 
    

    
- 
When executing the commands in order, the cursor will never leave the 20 x 20 pixel canvas. 
    

    


    Examples 
    

    
0) 

    

    
     


    


    


    


    

    {"FORWARD 19", "LEFT", "FORWARD 19", "LEFT", "FORWARD 19", "LEFT", "FORWARD 19"}
    

    

    Returns: 
{"XXXXXXXXXXXXXXXXXXXX",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "X..................X",
 "XXXXXXXXXXXXXXXXXXXX" }
    

    


    


    
This sequence of commands draws a 20 x 20 outline of a square. The cursor is initially at (0, 0) pointing straight down. It then travels to (0, 19) after the first FORWARD command, painting each pixel along its path with a '*'. It then rotates 90 degrees left, travels to (19, 19), rotates 90 degrees left, travels to (19, 0), rotates 90 degrees left, and finally travels back to (0, 0). 
    

    
1) 

    

    
     


    


    


    


    

    {"LEFT", "LEFT", "LEFT", "LEFT", "LEFT", "LEFT", "LEFT", "LEFT"}
    

    

    Returns: 
{"....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "...................." }
    

    


    


    
The cursor spins round and round, but never actually paints any pixels. The result is an empty canvas. 
    

    
2) 

    

    
     


    


    


    


    

    {"FORWARD 1"}
    

    

    Returns: 
{"X...................",
 "X...................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "....................",
 "...................." }
    

    


    


    
Going forward by one pixel creates a line that is 2 pixels long because both the start and end points are painted. 
    

    
3) 

    

    
     


    


    


    


    

    {"LEFT", "FORWARD 19", "LEFT", "LEFT", "LEFT",
 "FORWARD 18", "LEFT", "LEFT", "LEFT", "FORWARD 17",
 "LEFT", "LEFT", "LEFT", "FORWARD 16", "LEFT",
 "LEFT", "LEFT", "FORWARD 15", "LEFT", "LEFT", "LEFT",
 "FORWARD 14", "LEFT", "LEFT", "LEFT", "FORWARD 13",
 "LEFT", "LEFT", "LEFT", "FORWARD 12", "LEFT", "LEFT",
 "LEFT", "FORWARD 11", "LEFT", "LEFT", "LEFT", "FORWARD 10",
 "LEFT", "LEFT", "LEFT", "FORWARD 9", "LEFT", "LEFT",
 "LEFT", "FORWARD 8", "LEFT", "LEFT", "LEFT", "FORWARD 7"}
    

    

    Returns: 
{"XXXXXXXXXXXXXXXXXXXX",
 "...................X",
 "..XXXXXXXXXXXXXXXX.X",
 "..X..............X.X",
 "..X.XXXXXXXXXXXX.X.X",
 "..X.X..........X.X.X",
 "..X.X.XXXXXXXX.X.X.X",
 "..X.X.X........X.X.X",
 "..X.X.X........X.X.X",
 "..X.X.X........X.X.X",
 "..X.X.X........X.X.X",
 "..X.X.X........X.X.X",
 "..X.X.X........X.X.X",
 "..X.X.X........X.X.X",
 "..X.X.XXXXXXXXXX.X.X",
 "..X.X............X.X",
 "..X.XXXXXXXXXXXXXX.X",
 "..X................X",
 "..XXXXXXXXXXXXXXXXXX",
 "...................." }
    

    

    

    


    This problem statement is the exclusive and proprietary property of TopCoder, Inc. Any unauthorized use or reproduction of this information without the prior written consent of TopCoder, Inc. is strictly prohibited. (c)2003, TopCoder, Inc. All rights reserved. 

    答案：

    

      1public class DrawLines {
      2
      3
      4    public String[] execute(String[] commands){
      5        if (commands == null || commands.length == 0) return null;
      6
      7        // initialize result array
      8        String[][] canvas = new String[20][20];
      9        for(int i = 0; i < 20; i++){
     10            for(int j = 0; j < 20; j++){
     11                canvas[i][j] = ".";
     12            }
     13        }
     14
     15        // execute commands
     16        int m = 0;
     17        int n = 1;
     18        int x = 0;
     19        int y = 0;
     20        int movelength = 0;
     21        for(int index = 0; index < commands.length; index++){
     22            if("LEFT".equalsIgnoreCase(commands[index])){
     23                System.out.println("LEFT");
     24                if(m == 0 && n == 1){
     25                    m = 1;
     26                    n = 0;
     27                }    else if(m == 1 && n == 0){
     28                    m = 0;
     29                    n = -1;
     30                }    else if(m == 0 && n == -1){
     31                    m = -1;
     32                    n = 0;
     33                }    else if(m == -1 && n == 0){
     34                    m = 0;
     35                    n = 1;
     36                }
     37                System.out.println("m, n:" + m + "," + n);
     38                continue;
     39            }
     40
     41            if("FORWARD".equalsIgnoreCase(commands[index].substring(0, 7))){
     42                movelength = Integer.parseInt(commands[index].substring(8, commands[index].length()));
     43                System.out.println("movelength:" + movelength);
     44                if(m == 0 && n == 1){
     45                    for(int j = y; j <= y + movelength * n; j += n){
     46                        canvas[x][j] = "X";
     47                    }
     48                    y = y + movelength * n;
     49                }
     50                if(m == 0 && n == -1){
     51                    for(int j = y; j >= y + movelength * n; j += n){
     52                        canvas[x][j] = "X";
     53                    }
     54                    y = y + movelength * n;
     55                }
     56                if(n == 0 && m == 1){
     57                    for(int i = x; i <= x + movelength * m; i += m){
     58                        canvas[i][y] = "X";
     59                    }
     60                    x = x + movelength * m;
     61                }
     62                if(n == 0 && m == -1){
     63                    for(int i = x; i >= x + movelength * m; i += m){
     64                        canvas[i][y] = "X";
     65                    }
     66                    x = x + movelength * m;
     67                }
     68                System.out.println("x, y:" + x + "," + y);
     69            }
     70        }
     71
     72        // format result
     73        String[] result = new String[20];
     74        for(int j = 0; j < 20; j++){
     75            result[j] = "";
     76            for(int i = 0; i < 20; i++){
     77                result[j] += canvas[i][j];
     78            }
     79        }
     80        return result;
     81
     82
     83    }
     84
     85    /**
     86     * @param args
     87     */
     88    public static void main(String[] args) {
     89        DrawLines drawLines = new DrawLines();
     90        String[] input = new String[7];
     91        //input = {"FORWARD 19", "LEFT", "FORWARD 19", "LEFT", "FORWARD 19", "LEFT", "FORWARD 19"};
     92        input[0] = "FORWARD 19";
     93        input[1] = "LEFT";
     94        input[2] = "FORWARD 19";
     95        input[3] = "LEFT";
     96        input[4] = "FORWARD 19";
     97        input[5] = "LEFT";
     98        input[6] = "FORWARD 19";
     99
    100        String[] result = drawLines.execute(input);
    101
    102        for(int i = 0; i < result.length; i++){
    103            System.out.println(result[i]);
    104        }
    105    }
    106
    107}
    108
    
	
    posted on 2005-11-27 23:37 風蕭蕭 閱讀(1161) 評論(0)  編輯  收藏  所屬分類: 雜談 
    

    







    
	    
    




    








    

				

    

    
	
		
    
			
    			
			
    
	
    
		
    <2005年11月>
    
	
    日一二三四五六
    303112345
    6789101112
    13141516171819
    20212223242526
    27282930123
    45678910
    

    

			

    常用鏈接
    


    留言簿(8)
    




		
    隨筆分類
    
		
				
			
	
		
    隨筆檔案
    
		
				
			
	
		
    文章分類
    
		
				
			
	
		
    文章檔案
    
		
				
			
	
		
    相冊
    
		
				
			
	
		
    收藏夾
    
		
				
			
	
		
    myfriends
    
		
				
      
			
				
    
			
	
		
    opensource
    
		
				
			
	




    搜索
    

      
	
    • 
		
    •  
	
      • 

    


    最新評論
	
    

    
	
			
		

    


    閱讀排行榜
    



    評論排行榜
    


    
	

    




    







    
        
	



主站蜘蛛池模板：
人人公开免费超级碰碰碰视频|
成年女人免费v片|
亚洲国产精品成人午夜在线观看
|
国产一区二区三区免费看|
99re免费在线视频|
一级特黄色毛片免费看|
国产成人精品日本亚洲直接|
国产亚洲3p无码一区二区|
免费萌白酱国产一区二区|
无码国产精品一区二区免费式影视
|
美女露隐私全部免费直播|
亚洲六月丁香六月婷婷蜜芽|
亚洲精品蜜桃久久久久久|
波多野结衣中文一区二区免费
|
亚洲成人免费电影|
亚洲国产精品VA在线看黑人
|
男男黄GAY片免费网站WWW|
ASS亚洲熟妇毛茸茸PICS|
亚洲啪啪免费视频|
亚洲精品一区二区三区四区乱码
|
99精品视频免费观看|
嫩草成人永久免费观看|
成av免费大片黄在线观看|
一区二区免费在线观看|
羞羞漫画登录页面免费|
在线精品自拍亚洲第一区|
亚洲欧美日韩中文无线码|
亚洲av一本岛在线播放|
亚洲精品国产专区91在线|
亚洲国产人成在线观看69网站
|
亚洲av色香蕉一区二区三区|
精品国产成人亚洲午夜福利|
国产精品亚洲片夜色在线
|
欧美a级在线现免费观看|
免费精品国产日韩热久久|
亚洲一区二区免费视频|
久久久久久久91精品免费观看|
三年片在线观看免费大全|
国产成人免费高清激情视频|
午夜视频在线观看免费完整版|
国产美女精品久久久久久久免费|