Created
August 19, 2017 16:00
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Given an array of strings, group anagrams together.
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package com.hrishikeshmishra.practices.string; | |
import java.util.ArrayList; | |
import java.util.Arrays; | |
import java.util.HashMap; | |
import java.util.List; | |
import java.util.Map; | |
import static com.hrishikeshmishra.practices.string.GroupAnagrams.getGroup; | |
/** | |
* Problem | |
* Group Anagrams | |
* Given an array of strings, group anagrams together. | |
* | |
* @author hrishikesh.mishra | |
* @link http://hrishikeshmishra.com/group-anagrams/ | |
*/ | |
public class GroupAnagrams { | |
public static List<List<String>> getGroup(String[] array) { | |
/** Group Anagrams **/ | |
List<List<String>> result = new ArrayList<>(); | |
/** Group by Anagrams **/ | |
Map<String, List<String>> groups = new HashMap<>(); | |
/** Iterate all array element one by one**/ | |
for (String element : array) { | |
/** | |
* Convert element to unique key that will be same for all anagrams | |
*/ | |
String key = convertToUniqueString(element); | |
/** Check key is present in map or not **/ | |
if (groups.containsKey(key)) { | |
groups.get(key).add(element); | |
} else { | |
List<String> list = new ArrayList<>(); | |
list.add(element); | |
groups.put(key, list); | |
} | |
} | |
result.addAll(groups.values()); | |
return result; | |
} | |
public static String convertToUniqueString(String str) { | |
char[] chars = new char[26]; | |
for (char c : str.toCharArray()) { | |
chars[c - 'a']++; | |
} | |
return new String(chars); | |
} | |
} | |
class GroupAnagramsTest { | |
public static void main(String[] args) { | |
String[] array = {"eat", "tea", "tan", "ate", "nat", "bat"}; | |
System.out.printf("Array : %s, Group: %s\n ", Arrays.toString(array), getGroup(array)); | |
} | |
} |
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