gistfile1.txt

1.palindrome
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

public class GroupByAnagram {
    public static String[][] groupAnagrams(String[] words) {
        Map<String, List<String>> anagrams = new TreeMap<>();
        for (String word : words) {
            char[] chars = word.toCharArray();
            sortChar(chars);
            String sortedWord = new String(chars);
            if (anagrams.containsKey(sortedWord)) {
                anagrams.get(sortedWord).add(word);
            } else {
                List<String> list = new ArrayList<>();
                list.add(word);
                anagrams.put(sortedWord, list);
            }
        }
        String[][] result = new String[anagrams.size()][];
        int i = 0;
        for (List<String> list : anagrams.values()) {
            result[i] = list.toArray(new String[list.size()]);
            i++;
        }
        return result;
    }
    public static char[] sortChar(char[] chars) {
        for (int i = 0; i < chars.length - 1; i++) {
            for (int j = 0; j < chars.length - i - 1; j++) {
                if (chars[j] > chars[j + 1]) {
                    char temp = chars[j];
                    chars[j] = chars[j + 1];
                    chars[j + 1] = temp;
                }
            }
        }
        return chars;
    }

    public static void main(String[] args) {
        String[] words = {"cook","save","aves","vase","taste","state","map"};
        String[][] anagramGroups = groupAnagrams(words);
        for (String[] group : anagramGroups) {
            for (String word : group) {
                System.out.print(word + " ");
            }
            System.out.println();
        }
    }
}
2.SQL Query
SELECT * FROM CHILDREN LEFT JOIN PARENT ON PARENT.id = CHILDREN.parent_id;