Help,could you tell me what's the problem of my procedure?
#include <stdio.h>
 
static int map[11][11];
int q[150][2];
int N,i,j;
int x,y,a,b;
int head,tail;
 
int main()
{
    scanf("%d",&N);
 
    a = 10,b = 10;
    for(i = 0;i < N;i++)
    {
        scanf("%d%d",&x,&y);
        map[x][y] = 1;
        if(x < a)
        {
            a = x,b = y;
        }
        else if(x == a && y < b)
        {
            a = x,b = y;
        }
        scanf("\n");
    }
 
 
    printf("%d %d\n",a,b);
    for(head = 0,tail = head + 1,q[head][0] = a,q[head][1] =
b,map[a][b] = 2;head < tail;head++)
    {
        x = q[head][0];
        y = q[head][1];
        if(map[x + 1][y] == 1)
        {
            map[x + 1][y] = 2;
            q[tail][0] = x + 1;
            q[tail++][1] = y;
            printf("R");
        }
        if(map[x][y + 1] == 1)
        {
            map[x][y + 1] = 2;
            q[tail][0] = x;
            q[tail++][1] = y + 1;
            printf("T");
        }
        if(map[x - 1][y] == 1)
        {
            map[x - 1][y] = 2;
            q[tail][0] = x - 1;
            q[tail++][1] = y;
            printf("L");
        }
        if(map[x][y - 1] == 1)
        {
            map[x][y - 1] = 2;
            q[tail][0] = x;
            q[tail++][1] = y - 1;
            printf("B");
        }
        map[x][y] = 3;
 
        if(tail - 1 == head)
            printf(".\n");
        else
            printf(",\n");
    }
 
    return 0;
}