Minesweeper.java

public class Minesweeper {
    public static void main(String[] args) {
        int row = Integer.parseInt(args[0]);
        int col = Integer.parseInt(args[1]);
        int total_mines = Integer.parseInt(args[2]);
        int[][] grid = new int[row][col];
        int[] indices = new int[row * col];
        
        for (int i = 0; i < (row * col); i++) {
            indices[i] = i;
        }
        for (int i = 0; i < (row * col); i++) {
            int ran = i + (int) (Math.random() * (row * col) - i);
            int x = indices[i];
            indices[i] = indices[ran];
            indices[ran] = x;
        }
        for (int i = 0; i < total_mines; i++) {
            int r = indices[i] / col;
            int c = indices[i] % col;
            grid[r][c] = -1;
        }
        for (int i = 0; i < row; i++) {
            for (int j = 0; j < col; j++) {
                int count = 0;
                if (grid[i][j] == -1) {
                    if (j == 0)
                        System.out.print("* ");
                    else if (j == col - 1)
                        System.out.print(" *");
                    else
                        System.out.print(" * ");
                }
                else {
                    if (j < col - 1 && grid[i][j + 1] == -1) count++;
                    if (j > 0 && grid[i][j - 1] == -1) count++;
                    if (i < row - 1 && grid[i + 1][j] == -1) count++;
                    if (i > 0 && grid[i - 1][j] == -1) count++;
                    if (i < row - 1 && j < col - 1 && grid[i + 1][j + 1] == -1) count++;
                    if (i > 0 && j < col - 1 && grid[i - 1][j + 1] == -1) count++;
                    if (i < row - 1 && j > 0 && grid[i + 1][j - 1] == -1) count++;
                    if (i > 0 && j > 0 && grid[i - 1][j - 1] == -1) count++;

                    if (j == 0)
                        System.out.print(count + " ");
                    else if (j == col - 1)
                        System.out.print(" " + count);
                    else
                        System.out.print(" " + count + " ");
                }
            }
            System.out.println();
        }
    }
}