Are you fond of collecting some kind of stuff? Mike is crazy about
collecting stamps. He is an active member of Stamp Collecting Сommunity(SCC)
.
SCC consists of N members which are fond of philately. A few days ago Mike
argued with the others from SCC. Mike told them that all stamps of the
members could be divided in such a way that i'th member would get i postage
stamps. Now Mike wants to know if he was right. The next SCC meeting is
tomorrow. Mike still has no answer.
So, help Mike! There are N members in the SCC, i'th member has Ci stamps in
his collection. Your task is to determine if it is possible to redistribute
C1 + C2 + ... + Cn stamps among the members of SCC thus that i'th member
would get i stamps.
This is a(n):
Details:
Are you fond of collecting some kind of stuff? Mike is crazy about collecting stamps. He is an active member of Stamp Collecting Сommunity(SCC) .
SCC consists of N members which are fond of philately. A few days ago Mike argued with the others from SCC. Mike told them that all stamps of the members could be divided in such a way that i'th member would get i postage stamps. Now Mike wants to know if he was right. The next SCC meeting is tomorrow. Mike still has no answer.
So, help Mike! There are N members in the SCC, i'th member has Ci stamps in his collection. Your task is to determine if it is possible to redistribute C1 + C2 + ... + Cn stamps among the members of SCC thus that i'th member would get i stamps.