ICPC Dhaka Regional 2019 H Solution C++

#include <bits/stdc++.h>
using namespace std;
int counts = 0;
int rows, cols;
void floodfill(int x, int y, char grid[1000][1000])
{
    if (grid[x][y] == '#')
    {
        return;
    }
    grid[x][y] = '#';
    counts++;
    if (grid[x][y+1] != '*' && y+2<cols)//go right
    {
        floodfill(x,y+2, grid);
    }
    if (grid[x][y-1]!='*' && y-2> 0)//go left
    {
        floodfill(x,y-2,grid);
    }
    if (grid[x+1][y] != '*' && x+2<rows)//go down
    {
        floodfill(x+2,y,grid);
    }
    if (grid[x-1][y] != '*' && x-2>0)//go up
    {
        floodfill(x-2,y,grid);
    }
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int tc;
    cin >> tc;
    for (int i = 0; i < tc; ++i)
    {
        cout << "Case " << i+1 << ": ";
        int row, col;
        cin >> row >> col;
        char grid[row][col];
        for (int j = 0; j < row; ++j)
        {
            for (int k = 0; k < col; ++k)
            {
                cin >> grid[j][k];
            }
        }
        int new_row = row+(row-1);
        int new_col = col+(col-1);
        char grid2[new_row][1000] = {' '};
        int tmp_j = 0;
        for (int j = 0; j < new_row; j+=2)
        {
            int tmp_k = 0;
            for (int k = 0; k < new_col; k+=2)
            {
                grid2[j][k] = grid[tmp_j][tmp_k++];
            }
            tmp_j++;
        }
        for (int j = 0; j < new_row; j+=2)
        {
            for (int k = 0; k < new_col; k+=2)
            {
                if (grid2[j][k] == 'D')
                {
                    grid2[j+1][k] = '*';//down
                }
                if (grid2[j][k] == 'B')
                {
                    grid2[j+1][k] = '*';//down
                    grid2[j][k+1] = '*';//right
                }
                if (grid2[j][k] == 'R')
                {
                    grid2[j][k+1] = '*';//right
                }
            }
        }
        counts = 0;
        rows = new_row;
        cols = new_col;
        for (int i = 1; i < new_col; i+=2)
        {
            if (grid2[0][i] != '*')
            {
                floodfill(1, i, grid2);
            }
        }
        cout << counts << endl;
    }
    return 0;
}