[프로그래머스] 평행

import java.util.*;

class Solution {
    public int solution(int[][] dots) {
        double[] line = new double[6];

        int index = 0; 

        for(int i = 0; i < 3; i++) {
            for(int j = i + 1; j < 4; j++) {
                double slope 
                    = (double)(dots[i][1] - dots[j][1]) / (double)(dots[i][0] - dots[j][0]);
                line[index] = slope;
                index++;
            }
        }
        
        for(int i = 0; i < 5 ; i++){
            for(int j = i + 1; j < 6; j++) {
                if (line[i] == line[j]) return 1;
            }
        }

        return 0;
    }
}