import java.util.*; class Solution { public boolean solution(String[] phone_book) { boolean answer = true; Arrays.sort(phone_book, new Comparator(){ public int compare(String s1, String s2){ return s1.length()-s2.length(); } }); for(int i=0; i

class Solution { public String solution(String s) { String answer = ""; int flag =0; for(int i=0; i

class Solution { public int[][] solution(int[][] arr1, int[][] arr2) { int len1 = arr1.length; int len2 = arr1[0].length; int len3 = arr2[0].length; int[][] answer = new int[len1][len3]; for(int i=0; i

import java.util.*; class Solution { class User{ String uid; String nickname; User(String uid, String nickname){ this.uid = uid; this.nickname = nickname; } } public String[] solution(String[] record) { String[] answer = {}; int answersize = 0; List list = new ArrayList(); for(int i=0; i

class Solution { public int solution(int n) { int answer = 0; for(int i=1; i

class Solution { public String solution(int n) { String answer = ""; while(n!=0){ if(n%3==0){ answer = 4 + answer; n = n/3-1; }else{ answer = n%3 + answer; n /= 3; } } return answer; } }