Compilare: user.c: In function ‘main’: user.c:14:38: warning: unused variable ‘m’ [-Wunused-variable] int p , n , i , j , prim , ult , m , x , y; ^ user.c:18:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("alee.in" , "r" , stdin); ^ user.c:20:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d" , &n , &p); ^ user.c:31:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d" , &x , &y); ^ user.c:35:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d" , &pinit.lin , &pinit.col , &pfin.lin , &pfin.col); ^ user.c:58:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("alee.out" , "w" , stdout); ^