2d arrays

• 1 min read

AP CSA

Popcorn hack 1

int[][] scores = {
    {100, 85, 95, 96},
    {98, 100, 100, 95},
    {92, 100, 98, 100},
    {100, 100, 97, 99},
    {100, 100, 100, 70},
    {100, 100, 99, 98},
    {100, 94, 100, 93}
};

int score1 = scores[2][0];
int score2 = scores[4][3];
int score3 = scores[6][3];
System.out.println(score1);
System.out.println(score2);
System.out.println(score3);
scores[6][3] = 100;
int score3 = scores[6][3];
System.out.println(score3);


92
70
93
100

HW Latin Square

int[][] square = {
    {1, 3, 2},
    {2, 1, 3},
    {3, 2, 1}
};

public static boolean isLatin(int[][] square) {
    int n = square.length;

    for (int row = 0; row < n; row++) {
        boolean[] seen = new boolean[n + 1];
        for (int col = 0; col < n; col++) {
            int value = square[row][col];
            if (value < 1 || value > n || seen[value]) {
                return false;
            }
            seen[value] = true;
        }
    }

    for (int col = 0; col < n; col++) {
        boolean[] seen = new boolean[n + 1];
        for (int row = 0; row < n; row++) {
            int value = square[row][col];
            if (value < 1 || value > n || seen[value]) {
                return false;
            }
            seen[value] = true;
        }
    }
    return true;
}

System.out.println(isLatin(square));

true