CCF2016.4 B题

思路：创建两个bool数组来模拟下落过程，一个存放面板状态，一个存放下落的格子。检测格子和面板对应位置是否同时为True，如果是则有冲突，不能继续下落，否则增加行号。为了统一处理，我们把面板最下面加一行True。

import java.util.*;
public class Main {
    static boolean[][] board = new boolean[20][20];
    static boolean[][] block = new boolean[4][4];
    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        for (int i = 0; i < 15; i++)
            for (int j = 0; j < 10; j++)
                board[i][j] = cin.nextInt() == 1;
        for (int i = 0; i < 10; i++)
            board[15][i] = true;
        for (int i = 0; i < 4; i++)
            for (int j = 0; j < 4; j++)
                block[i][j] = cin.nextInt() == 1;
        int c = cin.nextInt(), r = 0;
        c--;
        while (check(r + 1, c))
            r++;
        for (int i = 0; i < 4; i++)
            for (int j = 0; j < 4; j++)
                if (block[i][j])
                    board[r + i][c + j] = true;
        for (int i = 0; i < 15; i++) {
            for (int j = 0; j < 9; j++)
                System.out.print((board[i][j] ? 1 : 0) + " ");
            System.out.println(board[i][9] ? 1 : 0);
        }
    }
    static boolean check(int r, int c) {
        for (int i = 0; i < 4; i++)
            for (int j = 0; j < 4; j++)
                if (board[r + i][c + j] && block[i][j])
                    return false;
        return true;
    }
}