#include "stdio.h"
#define max_matrix 10
int visited[max_matrix],matrix[max_matrix][max_matrix];
int n;
int board_traverse();
int main()
{
int i,j;
scanf("%d",&n);
if (n<1)
{
printf("n must be >1\n");
exit(0);
}
if (n>max_matrix)
{
printf("n must be <%d\n",max_matrix);
exit(0);
}
for (i=0;i<n;i++)
{
visited[i]=0;
for (j=0;j<n;j++)
matrix[i][j] = 0;
}
while (scanf("%d %d",&i,&j)==2)
{
matrix[i-1][j-1]=1;
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