[ACM] HDU 1796 How many integers can you find (容斥原理)
HowmanyintegerscanyoufindProblemDescription NowyougetanumberN,andaM-integersset,youshouldfindouthowmanyintegerswhicharesmallthanN,thattheycandividedexactlybyanyintegersintheset.Forexample,N=12,andM-i