[백준 1018] 체스판 다시 칠하기

문제

https://www.acmicpc.net/problem/1018

1018번: 체스판 다시 칠하기

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내가 작성한 코드

import java.io.*;
import java.util.ArrayList;
import java.util.StringTokenizer;

public class qor1018 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        StringTokenizer st = new StringTokenizer(br.readLine());
        int sero = Integer.parseInt(st.nextToken());
        int garo = Integer.parseInt(st.nextToken());

        String black = "BWBWBWBW";
        String white = "WBWBWBWB";

        ArrayList<String> chess = new ArrayList<>();
        for(int i = 0; i<sero; i++){
            chess.add(br.readLine());
        }

        int bmin = 64;
        int wmin = 64;

        // 첫 줄이 black인 경우
        int si = 0;
        int gi = 0;

        while(si<=sero-8){
            gi = 0;

            while(gi<=garo-8){
                int count = 0;

                for(int i = 0; i<8; i++){
                    String sen = chess.get(si+i);
                    if(i%2==0){
                        for(int j = 0; j<8; j++){
                            if(sen.charAt(gi+j) != black.charAt(j)){
                                count++;
                            }
                        }
                    }
                    else{
                        for(int j = 0; j<8; j++){
                            if(sen.charAt(gi+j) != white.charAt(j)){
                                count++;
                            }
                        }
                    }
                }

                if(count<bmin){
                    bmin = count;
                }

                gi++;
            }

            si++;
        }

        // 첫 줄이 white인 경우
        si = 0;
        gi = 0;

        while(si<=sero-8){
            gi = 0;

            while(gi<=garo-8){
                int count = 0;

                for(int i = 0; i<8; i++){
                    String sen = chess.get(si+i);
                    if(i%2==0){
                        for(int j = 0; j<8; j++){
                            if(sen.charAt(gi+j) != white.charAt(j)){
                                count++;
                            }
                        }
                    }
                    else{
                        for(int j = 0; j<8; j++){
                            if(sen.charAt(gi+j) != black.charAt(j)){
                                count++;
                            }
                        }
                    }
                }

                if(count<wmin){
                    wmin = count;
                }

                gi++;
            }

            si++;
        }

        if(bmin<wmin){
            bw.write(bmin+"");
        }
        else{
            bw.write(wmin+"");
        }

        bw.close();
    }
}

어휴야 길다