Eroare de compilare: user.c:7:15: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token int A(const P &p,const P &q) { return p.x<q.x||(p.x==q.x&&p.y<q.y); } ^ user.c: In function ‘main’: user.c:31:22: error: ‘A’ undeclared (first use in this function) qsort(a,n,sizeof(P),A); ^ user.c:31:22: note: each undeclared identifier is reported only once for each function it appears in user.c:28:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in","r",stdin),freopen("cmap.out","w",stdout),scanf("%d",&n); ^ user.c:28:38: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in","r",stdin),freopen("cmap.out","w",stdout),scanf("%d",&n); ^ user.c:28:67: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in","r",stdin),freopen("cmap.out","w",stdout),scanf("%d",&n); ^ user.c:30:11: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&a[i].x,&a[i].y); ^