https://school.programmers.co.kr/learn/courses/30/lessons/42746?language=java
public class PG_가장큰수 {
public String solution(int[] numbers) {
String[] stringArray = new String[numbers.length];
StringBuilder sb = new StringBuilder();
//String answer = "";
for(int i=0; i<stringArray.length; i++){
stringArray[i] = Integer.toString(numbers[i]);
}
Arrays.sort(stringArray, Collections.reverseOrder());
for (int i=0; i<stringArray.length; i++) {
//if(stringArray[i])
sb.append(stringArray[i]);
}
return sb.toString();
}
public static void main(String[] args) {
PG_가장큰수 pg_가장큰수 = new PG_가장큰수();
int[] numbers = {3, 30, 34, 5, 9};
System.out.println(pg_가장큰수.solution(numbers));
}
}
public String solution(int[] numbers) {
String[] stringArray = new String[numbers.length];
StringBuilder sb = new StringBuilder();
//String answer = "";
for(int i=0; i<stringArray.length; i++){ //문자열 배열로 만들고
stringArray[i] = Integer.toString(numbers[i]);
}
Arrays.sort(stringArray, (a,b) -> (b+a).compareTo(a+b));
for(String s : stringArray){
sb.append(s);
}
return sb.toString();
}
public String solution(int[] numbers) {
String[] stringArray = new String[numbers.length];
StringBuilder sb = new StringBuilder();
for (int i = 0; i < stringArray.length; i++) { //문자열 배열로 만들고
stringArray[i] = Integer.toString(numbers[i]);
}
Arrays.sort(stringArray, (a, b) -> (b + a).compareTo(a + b));
if (stringArray[0].equals("0")) { //정렬 후에도 0이 맨앞이면
return "0";
}
for (String s : stringArray) {
sb.append(s);
}
return sb.toString();
}