[SWEA] 8821. 적고 지우기_JAVA feat.set사용하기

https://swexpertacademy.com/main/code/problem/problemDetail.do?problemLevel=3&contestProbId=AW37UDPKCgQDFATy&categoryId=AW37UDPKCgQDFATy&categoryType=CODE&problemTitle=&orderBy=FIRST_REG_DATETIME&selectCodeLang=ALL&select-1=3&pageSize=10&pageIndex=5 

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//set 삭제
set.remove();
//set 안에 값 확인 
set.contains();

import java.util.*;
import java.io.FileInputStream;

class Solution{
	public static void main(String args[]) throws Exception{
		Scanner sc = new Scanner(System.in);
		int T;
		T=sc.nextInt();
		for(int test_case = 1; test_case <= T; test_case++)
		{
            String str=sc.next();
            Set<Integer> set=new HashSet<>();
            for( char c: str.toCharArray()){
                if(set.contains(c-'0')){
                    set.remove(c-'0');
                }else set.add(c-'0');
            }
                       System.out.println("#"+test_case+" "+set.size());
		}
	}
}