[SW Expert Academy] 숫자 조작 (D3)

https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AX4EJPs68IkDFARe&categoryId=AX4EJPs68IkDFARe&categoryType=CODE&problemTitle=%EC%88%AB%EC%9E%90+%EC%A1%B0%EC%9E%91&orderBy=FIRST_REG_DATETIME&selectCodeLang=ALL&select-1=&pageSize=10&pageIndex=1

SW Expert Academy

 

1. arr 배열 한 번만 선언

import java.util.Scanner;

class Solution {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int t = sc.nextInt();

		for (int tc = 1; tc <= t; tc++) {
			String num = sc.next();

			int min = Integer.parseInt(num);
			int max = Integer.parseInt(num);

			char[] arr = num.toCharArray(); //같은 배열 쓰면서 계속 원복 시킴

			for (int i = 0; i < num.length() - 1; i++) {
				for (int j = i + 1; j < num.length(); j++) {
					swap(i, j, arr);
					if (arr[0] == '0') {
						swap(i, j, arr);
						continue;
					}
					max = Math.max(Integer.parseInt(new String(arr)), max);
					min = Math.min(Integer.parseInt(new String(arr)), min);
					swap(i, j, arr);
				}
			}

			System.out.println("#" + tc + " " + min + " " + max);

		}

	}

	public static void swap(int i, int j, char arr[]) {
		char tmp = arr[i];
		arr[i] = arr[j];
		arr[j] = tmp;
	}

}

 

2. arr 배열 여러 번 선언

import java.util.Scanner;

class Solution {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();

		for (int tc = 1; tc <= t; tc++) {

			String str = sc.next();

			int max = Integer.parseInt(str);
			int min = Integer.parseInt(str);

			for (int i = 0; i < str.length() - 1; i++) {
				for (int j = i + 1; j < str.length(); j++) {
					char[] arr = str.toCharArray(); //배열 초기화함

					swap(i, j, arr);                    
                    if(arr[0]=='0') continue; //바꿨는데 맨 앞이 0이면

					max = Math.max(max, Integer.parseInt(new String(arr)));
					min = Math.min(min, Integer.parseInt(new String(arr)));
				}
			}
			System.out.println("#" + tc + " " + min + " " + max);
		}

	}

	public static void swap(int i, int j, char arr[]) {
		char tmp = arr[i];
		arr[i] = arr[j];
		arr[j] = tmp;
	}
}