[백준/BOJ] 30406. 산타 춘배의 선물 나눠주기 [Silver 1]

30406. 산타 춘배의 선물 나눠주기
       문제출처 : https://www.acmicpc.net/problem/30406

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static StringTokenizer st;
    static int zerocnt=0,onecnt=0,twocnt=0,threecnt=0,result=0,N;
    public static void main(String args[])throws IOException{
        N = Integer.parseInt(br.readLine());
        st = new StringTokenizer(br.readLine()," ");
        for(int i=0;i<N;i++){
            int temp = Integer.parseInt(st.nextToken());
            switch (temp) {
                case 0:
                    zerocnt++;
                    break;
                case 1:
                    onecnt++;
                    break;
                case 2:
                    twocnt++;
                    break;
                case 3:
                    threecnt++;
                    break;
                default:
                    break;
            }
        }
        //3
        if(threecnt<=zerocnt){
            zerocnt-=threecnt;
            result+=3*threecnt;
            threecnt=0;
        }else{
            threecnt-=zerocnt;
            result+=3*zerocnt;
            zerocnt=0;
        }
        if(onecnt<=twocnt){
            twocnt-=onecnt;
            result+=3*onecnt;
            onecnt=0;
        }else{
            onecnt-=twocnt;
            result+=3*twocnt;
            twocnt=0;
        }
        //2
        if(twocnt<=zerocnt){
            zerocnt-=twocnt;
            result+=2*twocnt;
            twocnt=0;
        }else{
            twocnt-=zerocnt;
            result+=2*zerocnt;
            zerocnt=0;
        }
        if(onecnt<=threecnt){
            threecnt-=onecnt;
            result+=2*onecnt;
            onecnt=0;
        }else{
            onecnt-=threecnt;
            result+=2*threecnt;
            threecnt=0;
        }
        //1
        if(onecnt<=zerocnt){
            zerocnt-=onecnt;
            result+=1*onecnt;
            onecnt=0;
        }else{
            onecnt-=zerocnt;
            result+=1*zerocnt;
            zerocnt=0;
        }
        if(twocnt<=threecnt){
            threecnt-=twocnt;
            result+=1*twocnt;
            twocnt=0;
        }else{
            twocnt-=threecnt;
            result+=1*threecnt;
            threecnt=0;
        }

        System.out.println(result);
    }    
}

어느순간부터 백준 티어가 잘안올라가는거같다.
더 높은곳, 더 어려운문제에 도전을 할 생각을해야하는데 현생에 치여살다보니 그럴 여유가 없기도 하고, 좀 나태해진것같기도하다...... 이래살면안되는데 ㅠ