[Java] 8821. 적고 지우기

D3 - 8821. 적고 지우기

문제출처: https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AW37UDPKCgQDFATy&categoryId=AW37UDPKCgQDFATy&categoryType=CODE


순서대로 숫자를 읽어 쓰여져 있을지를 확인하여 해결한 문제

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

class Solution
{
    static boolean[] isWritten = new boolean[10];
    public static void main(String args[]) throws Exception
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int T = Integer.parseInt(br.readLine());

        for(int test_case = 1; test_case <= T; test_case++)
        {
            Arrays.fill(isWritten, false);
            String numbers = br.readLine();
            for (int i = 0; i < numbers.length(); i++) {
                int num = (numbers.charAt(i)) - '0';
                isWritten[num] = !isWritten[num];
            }
            int count = 0;
            for (boolean b : isWritten) {
                if (b) count++;
            }
            System.out.println("#"+test_case+" "+count);
        }
        br.close();
    }
}