[해커랭크003] Diagonal Difference

Practice>Algorithms>Warmup>Diagonal Difference

 

포인트

1. 2중 List (기존 List와 유사하게 사용)

  - 삽입 .add(값)

  - 사용 .get(INDEX_NUM)

  - 수정 .set(INDEX_NUM, 수정값)

2. 절대값 함수

  - Math.abs(적용값)

 

정답.

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

class Result {

    /*
     * Complete the 'diagonalDifference' function below.
     *
     * The function is expected to return an INTEGER.
     * The function accepts 2D_INTEGER_ARRAY arr as parameter.
     */

    public static int diagonalDifference(List<List<Integer>> arr) {
        // Write your code here

        int array_size = arr.size();
        int sum_l_to_r =0;
        int sum_r_to_l =0;

        for(int i=0; i< array_size ; i++){
            sum_l_to_r += arr.get(i).get(i);
            sum_r_to_l += arr.get(i).get(array_size-1-i);
        }
        return Math.abs(sum_l_to_r - sum_r_to_l);
    }

}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int n = Integer.parseInt(bufferedReader.readLine().trim());

        List<List<Integer>> arr = new ArrayList<>();

        for (int i = 0; i < n; i++) {
            String[] arrRowTempItems = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");

            List<Integer> arrRowItems = new ArrayList<>();

            for (int j = 0; j < n; j++) {
                int arrItem = Integer.parseInt(arrRowTempItems[j]);
                arrRowItems.add(arrItem);
            }

            arr.add(arrRowItems);
        }

        int result = Result.diagonalDifference(arr);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}