/* 
 * demo of  display_board and attack
 */
#include <stdio.h>

void display_board(int n, int *conf);
int attack(int row1, int col1, int row2, int col2);

int main()
{
    /* valid configuration */
    int str[] = {2, 5, 3, 1, 7, 4, 6, 0};

    printf("%d\n", attack(str[0], 0, str[7], 7));
    display_board(sizeof(str)/sizeof(*str), str);

    return 0;
}