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LongestWord.java
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LongestWord.java
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package com.hrishikeshmishra.practices.mixed;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Problem:
* Longest Word Made of Other Words
* Find the longest word made of other words
*
* @author hrishikesh.mishra
* @link http://hrishikeshmishra.com/longest-word-made-words/
*/
public class LongestWord {
public static String find(List<String> dictionary) {
Map<String, Boolean> isVisited = getWordMap(dictionary);
Collections.sort(dictionary, new LengthComparator());
for (String word : dictionary) {
if (isLongestWord(word, true, isVisited)) {
return word;
}
}
return null;
}
private static boolean isLongestWord(String word, boolean isOriginalWord, Map<String, Boolean> map) {
if (!isOriginalWord && map.containsKey(word)) {
return map.get(word);
}
for (int i = 1; i < word.length(); i++) {
String left = word.substring(0, i);
String right = word.substring(i);
if (map.containsKey(left) &&
map.get(left) &&
isLongestWord(right, false, map)) {
return true;
}
}
map.put(word, false);
return false;
}
private static HashMap<String, Boolean> getWordMap(final List<String> dictionary) {
return new HashMap<String, Boolean>() {
{
for (String word : dictionary) {
put(word, true);
}
}
};
}
private static class LengthComparator implements Comparator<String> {
@Override
public int compare(String o1, String o2) {
return Integer.compare(o2.length(), o1.length());
}
}
}
class LongestWordTest {
public static void main(String[] args) {
List<String> dictionary = new ArrayList<String>() {
{
add("test");
add("tester");
add("testertest");
add("testing");
add("testingtester");
}
};
System.out.println("Dictionary : " + dictionary);
System.out.println("Longest Word: " + LongestWord.find(dictionary));
}
}