Compilare: user.c: In function ‘main’: user.c:48:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("kbetray.in","r",stdin); ^ user.c:49:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("kbetray.out","w",stdout); ^ user.c:51:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.c:54:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.c: In function ‘min_max’: user.c:20:5: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] return id; ^ user.c: In function ‘max_min’: user.c:32:5: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] return id; ^ user.c: In function ‘main’: user.c:67:27: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(pereche[id_min].max>pereche[id_max].min){ ^ user.c:67:47: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(pereche[id_min].max>pereche[id_max].min){ ^