[JAVA] 프로그래머스 - 세로 읽기

https://school.programmers.co.kr/learn/courses/30/lessons/181904

프로그래머스

 

 

 

 

 

 

정답 

 

class Solution {
    public String solution(String my_string, int m, int c) {
        String answer = "";
        
        char arr[][] = new char[m][m];
        
        if(m>1)
        {
            for(int i=0; i<my_string.length(); i++)
            {
                String temp = my_string.substring(i,i+m);
                
                for(int j=0; j<m; j++)
                {
                    for(int k=0; k<m; k++)
                    {
                        arr[j][k] = temp.charAt(j);
                    }
                }
            }
        }
        
        char result [] = new char[m];
        
        for(int i=0; i<m; i++)
        {
            result[i] = arr[i][m-1];
        }
        
        for(int i=0; i<result.length; i++)
        {
            answer += String.valueOf(result[i]);
        }
        
        if(m==1)
            answer = my_string;
        
        return answer;
    }
}

 

 

다른 사람의 풀이 

 

class Solution {
    public String solution(String my_string, int m, int c) {
        String[][] array2d = new String[my_string.length() / m][m];
        int index = 0;
        for (int i = 0; i < array2d.length; i++) {
            for (int j = 0; j < array2d[i].length; j++) {
                array2d[i][j] = my_string.substring(index, index+1);
                index++;
            }
        }

        String answer = "";
        for (int i = 0; i < array2d.length; i++) {
            answer += array2d[i][c-1];
        }
        return answer;
    }
}