wet lands of florida

#include <stdio.h>
#include <string.h>
#define mx 510

char grid[mx][mx];
char grid2[mx][mx];

int count = 0;
int ara[] = { -1, 0, 1 };
int n, m;
int len;

void init()
{
    int i, j;

    for (i = 0; i < mx; i++)
        for (j = 0; j < mx; j++)
            grid[i][j] = grid2[i][j] = '\0';
}

int checkValidity(int x, int y)
{
    if (x < 0)
        return 0;
    if (x >= m)
        return 0;

    if (y < 0)
        return 0;
    if (y >= len)
        return 0;

    return 1;
}

void copyGrid()
{
    count = 0;
    int i, j;

    for (i = 0; i < m; i++)
    {

        for (j = 0; j < strlen(grid[i]) ; j++)
        {
            grid2[i][j] = grid[i][j];
        }
        grid2[i][j] = '\0';
    }
}

void fill(int x, int y)
{
    int i, j;

    grid2[x][y] = 'L';
    count++;

    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            if (checkValidity(x + ara[i], y + ara[j]) && grid2[x + ara[i]][y + ara[j]] == 'W')
            {
                fill(x + ara[i], y + ara[j]);
            }
        }
    }

}


int main()
{
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);

    int t, T, i, j, k;
    int x, y;
    int u, v;
    char st[100];
    int fcheck = 0;

    scanf("%d", &T);
    getchar();
    getchar();

    for (t = 1; t <= T; t++)
    {
        i = 0;
        n = 0;
        m = 0;

        if (t != 1)
            printf("\n");

        init();

        while ( gets(grid[i]) )
        {
            if (grid[i][0] == '\0')
                break;
            if (grid[i][0] != 'W' && grid[i][0] != 'L' && 0 == n)
                n = i;
            i++;
        }
        m = i;
        len = strlen(grid[0]);

        for (k = n; k < m; k++)
        {
            x = y = i = 0;

            while (grid[k][i] != ' ')
                x = x * 10 + (grid[k][i++] - '0');
            i++;

            while (grid[k][i] != '\0')
                y = y * 10 + (grid[k][i++] - '0');

            copyGrid();

            fill(x - 1, y - 1);
            printf("%d\n", count);

        }
    }
}