#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main()
{
    int matrix[4][4];
    int operation;

    //读取数据
    scanf("%d", &operation);
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            scanf("%d", &matrix[i][j]);
        }
    }

    switch (operation)
    {
    //上
    case 1:
        for (int j = 0; j < 4; j++)
        {
            for (int i = 0, k; i < 4; i++)
            {
                if (matrix[i][j] != 0)
                {
                    int tmp = matrix[i][j];
                    for (k = i-1; k >= 0; k--) //找到前面第一个非0项
                    {
                        if (matrix[k][j] != 0)
                        {
                            break;
                        }
                    }
                    matrix[i][j] = 0;
                    matrix[k + 1][j] = tmp;                         //移动
                 ...