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ImageLayers（入圍賽750分真題）

Problem Statement
????
An image editing application allows users to construct images containing multiple layers. When dealing with large images, however, it is sometimes necessary to limit the number of layers due to memory constraints. If certain layers will not be altered during an editing session, they can be merged together to reduce the total number of layers in memory. You are given a macro containing commands to open files and merge layers. Each time a file is opened, it is loaded into a new layer of the current image. Layers are numbered starting at 0 for the bottommost layer, 1 for the layer directly on top of the bottommost layer, etc... Whenever a new layer is created, it is positioned on top of the previous topmost layer. An open command is formatted as "OPEN filename" where filename is the name of the file to open. Consecutive layers can be merged using the merge command, which is formatted as "MERGE layer1-layer2", where layer1 and layer2 specify an inclusive range of layer numbers that exist in the current image. After multiple layers are merged, all the layers are renumbered according to the original specification. For example, if an image contains four layers (0, 1, 2, 3), and layers 1 and 2 are merged into a single layer, the final image will contain three layers numbered 0, 1, 2 from bottom to top, where layer 0 is the same as before, layer 1 was previously layers 1 and 2, and layer 2 was previously layer 3.

Given the String[] macro, perform all the operations in the macro in order and return the final state of the image layers as a String[]. The String[] should contain exactly the same number of elements as there are layers in the final image, and each element i should correspond to the ith layer. Each element of the String[] should be a single space delimited list of the filenames contained in that layer. The filenames should be sorted in alphabetical order within each layer.
Definition
????
Class:
ImageLayers
Method:
contents
Parameters:
String[]
Returns:
String[]
Method signature:
String[] contents(String[] macro)
(be sure your method is public)
????

Constraints
-
macro will contain between 1 and 50 elements, inclusive.
-
Each element of macro will be formatted as either "OPEN filename" or "MERGE layer1-layer2".
-
Each filename in macro will contain between 1 and 15 lowercase letters ('a'-'z'), inclusive.
-
Each layer1 and layer2 in macro will be integers between 0 and n-1, inclusive, with no leading zeros, where n is the number of layers that exist in the image immediately before the command is executed.
-
Within each element of macro that represents a merge command, layer1 will be less than layer2.
-
The first element of macro will be an OPEN command.
Examples
0)

????
{"OPEN background",
"OPEN aone",
"OPEN atwo",
"OPEN foreground",
"MERGE 0-2",
"OPEN border"}
Returns: {"aone atwo background", "foreground", "border" }
After the first four commands in macro are executed, the layers are (from bottom to top):

0. background 1. aone 2. atwo 3. foreground

The merge command combines the bottom three layers into a single layer. There are now only two layers (from bottom to top):

0. background aone atwo 1. foreground

Finally, one last file is opened and placed in a new layer on top. The final return value contains the filenames within each layer sorted alphabetically:

0. aone atwo background 1. foreground 2. border
1)

????
{"OPEN sky",
"OPEN clouds",
"OPEN ground",
"MERGE 0-1",
"OPEN grass",
"MERGE 0-2",
"OPEN trees",
"OPEN leaves",
"OPEN birds",
"MERGE 1-2",
"MERGE 0-1"}
Returns: {"clouds grass ground leaves sky trees", "birds" }

????
{"OPEN a", "OPEN b", "OPEN a", "OPEN a", "MERGE 0-3"}
Returns: {"a a a b" }

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.

posted on 2005-08-23 11:44 emu 閱讀(1666) 評論(12) 編輯收藏所屬分類: google編程大賽模擬題及入圍賽真題

import java.util.*;
public class ImageLayers {
    public static void main(String[] args) {
        String[] macro = new String[] {"OPEN sky",
                         "OPEN clouds",
                         "OPEN ground",
                         "MERGE 0-1",
                         "OPEN grass",
                         "MERGE 0-2",
                         "OPEN trees",
                         "OPEN leaves",
                         "OPEN birds",
                         "MERGE 1-2",
                         "MERGE 0-1"}
;
        ImageLayers il = new ImageLayers();
        String[] contents = il.contents(macro);
        for (int i=0;i<contents.length;i++)
            System.out.println(contents[i]);


    }

    public String[] contents(String[] macro){
        ArrayList layers = new ArrayList();
        for (int i=0;i<macro.length;i++){
            String command = macro[i];
            if (command.startsWith("OPEN")){
                ArrayList layer = new ArrayList();
                layer.add(command.split(" ")[1]);
                layers.add(layer);
            }
            else if (command.startsWith("MERGE")){
                String[] l = command.split(" ")[1].split("-");
                int layer1 = Integer.parseInt(l[0],10);
                int layer2 = Integer.parseInt(l[1],10);
                ArrayList tmpLayers = (ArrayList)layers.get(layer1);
                for (int j=layer2;j>layer1;j--)
                    tmpLayers.addAll((ArrayList)layers.remove(j));
            }
        }
        String[] result = new String[layers.size()];
        for (int i=0;i<result.length;i++){
            Object[] stAr = ((ArrayList)layers.get(i)).toArray();
            Arrays.sort(stAr);
            String s = Arrays.toString(stAr).replace(',',' ');
            result[i] = s.substring(1,s.length()-1);
        }

        return result;
    }

}
  回復   更多評論

# re: ImageLayers（入圍賽750分真題） 2005-08-25 11:01 emu

遺憾的很，我這個答案沒有通過google的系統測試。回復更多評論

# re: ImageLayers（入圍賽750分真題） 2005-12-09 09:55 chenrenbo

你好像沒有對結果排序回復更多評論

# re: ImageLayers（入圍賽750分真題） 2005-12-09 10:54 emu

Arrays.sort(stAr); 不是排序是什么？回復更多評論

# re: ImageLayers（入圍賽750分真題） 2005-12-09 14:42 drekar

你的排序結果是用2個空格做間隔的("clouds<space><space>grass")，可能系統測試期望結果是1個空格("clouds<space>grass")。

把 String s = Arrays.toString(stAr).replace(",", "");
改成 String s = Arrays.toString(stAr).replace(",", "");
應該就好了。

下面是我的解法:

import java.util.ArrayList;
import java.util.Arrays;

public class ImageLayers {

　ArrayList canvas = new ArrayList();
　
　public String[] contents(String[] macro) {
　　if (null == macro)
　　　return new String[0];

　　for (int i=0; i<macro.length; i++) {
　　　String[] temp = macro[i].split(" ");
　　　if (temp[0].equalsIgnoreCase("OPEN"))
　　　　open(temp[1]);
　　　else
　　　　merge(temp[1]);
　　}
　　
　　String [] result = new String[canvas.size()];
　　for (int i=0; i<canvas.size(); i++)
　　　result[i] = (String)canvas.get(i);
　　return result;
　}
　
　public void open(String filename) {
　　canvas.add(filename);
　}
　
　public void merge(String layers) {
　　if (null == layers)
　　　return;
　　
　　String[] temp = layers.split("-");
　　int baseLayer = Integer.parseInt(temp[0]);
　　int lastLayer = Integer.parseInt(temp[1]);
　　if (baseLayer >= lastLayer || lastLayer >= canvas.size())
　　　return;
　　
　　String newLayerName = (String)canvas.get(baseLayer);
　　canvas.remove(baseLayer);
　　for (int i=baseLayer+1; i<= lastLayer; i++) {
　　　newLayerName += " " + canvas.get(baseLayer);
　　　canvas.remove(baseLayer);
　　}
　　temp = newLayerName.split(" ");
　　Arrays.sort(temp);
　　newLayerName = temp[0];
　　for (int i=1; i<temp.length; i++)
　　　newLayerName += " " + temp[i];

　　canvas.add(baseLayer, newLayerName);
　}
　
　/**
　 * @param args
　 */
　public static void main(String[] args) {
　　ImageLayers il = new ImageLayers();
　　String[] macro = { "OPEN sky", "OPEN clouds", "OPEN ground",
　　　　"MERGE 0-1", "OPEN grass", "MERGE 0-2", "OPEN trees",
　　　　"OPEN leaves", "OPEN birds", "MERGE 1-2", "MERGE 0-1" };
　　String[] result = il.contents(macro);
　　
　　for (int i=0; i<result.length; i++)
　　　System.out.println(result[i]);
　}
}

每次merge都排序，還是沒有你的代碼優化。回復更多評論

# 上個貼子有錯 2005-12-09 14:44 drekar

第3－4行應該是『

把 String s = Arrays.toString(stAr).replace(',', ' ');
改成 String s = Arrays.toString(stAr).replace(",", "");

』, :) 回復更多評論

# re: ImageLayers（入圍賽750分真題） 2005-12-09 14:50 emu

這道題當時沒有得分，恐怕不只是沒有排序，還有這個空格的問題。回復更多評論

# re: ImageLayers（入圍賽750分真題） 2005-12-11 11:51 john_wang71

試試看這個，完全用java.util.*中的類實現：
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;

public class ImageLayers
{
public String[] contents(String[] macro)
{
String[] s = new String[] {};
try
{
Vector v = new Vector();
for (int i = 0; i < macro.length; i++)
{
String m = macro[i];
switch (m.charAt(0))
{
case 'O':
List c = new ArrayList();
c.add(m.substring(5));
v.add(c);
break;
case 'M':
int pos = m.indexOf('-');
int l1 = Integer.parseInt(m.substring(6, pos));
List c1 = (List) v.elementAt(l1);
int l2 = Integer.parseInt(m.substring(pos + 1));
for (int l3 = l2; l3 > l1; l3--)
{
List c3 = (List) v.elementAt(l3);
for (Iterator iter3 = c3.iterator(); iter3.hasNext();)
c1.add(iter3.next());
v.remove(l3);
}
}
}
s = new String[v.size()];
int i = 0;
for (Iterator iter = v.listIterator(); iter.hasNext();)
{
List c = (List) iter.next();
Collections.sort(c);
StringBuffer sb = new StringBuffer();
boolean first = true;
for (Iterator iter1 = c.iterator(); iter1.hasNext();)
{
if (first)
first = false;
else
sb.append(' ');
sb.append(iter1.next());
}
s[i++] = sb.toString();
}
}
catch (Exception e)
{
}
return s;
}
}
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# re: ImageLayers（入圍賽750分真題） 2005-12-11 17:55 小飛俠

public class test {
public static String[] content(String[] macro) {
String[] mystr;
int cur, i,j, n, begin, end;
n = macro.length;
cur = 0;
mystr = new String[n];
//第一步操作,獲取merge的String數組
for (i = 0; i < n; i++) {
if (macro[i].startsWith("OPEN")) {
mystr[cur] = macro[i].substring(5);
}

if (macro[i].startsWith("MERGE")) {
begin = Integer.parseInt(macro[i].substring(6, macro[i].indexOf("-")));
end = Integer.parseInt(macro[i].substring(macro[i].indexOf("-")+1));

//實現合并操作
cur = begin;
for (j = begin + 1; j <= end; j++) {
mystr[cur] = mystr[cur].concat(" ").concat(mystr[j]);
mystr[j] = null;
}
}
cur++;
}

for (i = 0; i < n; i++) {
System.out.println(mystr[i]);
}

//下面將原始的合并后的字符串數組,排序: 排序后,返回真正的數組
mystr = sorts(mystr);

System.out.println("sort ===");
for (i = 0; i < mystr.length; i++) {
System.out.println(mystr[i]);
}

return mystr;
}

public static String[] sorts(String[] mystr) {
String[] ret;
int i, j, n, cnt, cur=0;

n = mystr.length;
cnt = 0;

//獲取實際的數組單元
for(i = 0, n = mystr.length; i < n; i++) {
if (mystr[i] != null)
cnt++;

}

ret = new String[cnt];

for (i = 0; i < n; i++) {
//對單元進行排序
if (mystr[i] != null) {
ret[cur++] = sort(mystr[i]);
}

}

System.out.println(cnt);
return ret;
}

//單元排序, 最簡單的冒泡排序
public static String sort(String str) {
String[] a;
int i, j,n, flag;
String temp;

if (str.indexOf(" ") < 0) {
return str;
}

//開始排序
a = str.split(" ");
n = a.length;
for (i = 1; i < n; i++) {
flag = 0;
for (j = 0; j < (n - i) ; j++) {
if (a[j].compareTo(a[j+1]) > 0) {
temp = a[j];
a[j] = a[j+1];
a[j+1] = temp;
flag = 1;
}
}

if (flag == 0) {
break;
}
}

//merge
str = a[0];
for (i = 1; i < n; i++) {
str = str.concat(" ").concat(a[i]);
}

return str;
}

public static void main(String args[]) {
String[] macro = {"OPEN sky",
"OPEN clouds",
"OPEN ground",
"MERGE 0-1",
"OPEN grass",
"MERGE 0-2",
"OPEN trees",
"OPEN leaves",
"OPEN birds",
"MERGE 1-2",
"MERGE 0-1"};

content(macro);

}
} 回復更多評論

# re: ImageLayers（入圍賽750分真題） 2005-12-12 09:12 emu

不贊成自己實現排序回復更多評論

# re: ImageLayers（入圍賽750分真題） 2005-12-12 11:49 小飛俠

哈,是的:)

把自己的排序,改成Arrays.sort(split) :)

嘻嘻,今天要比賽了,祝福各位,祝福emu, 也祝福我,小飛俠:)嘻嘻回復更多評論

# re: ImageLayers（入圍賽750分真題） 2005-12-12 15:23 emu

750分題的時間復雜度降不下來，看來通不過資格賽了，可惜…… 回復更多評論

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