Kanade has an infinity set H contain all of sets such as {(x,y)|x>=a,l
Kanade has an infinity set H contain all of sets such as {(x,y)|x>=a,l<=y<=r} (a,l,r are arbitrary real numbers) A point set S is good if and only if for each subset T of S there exist h in H satisfy h∩S=Th cap S=Th∩S=T Now kanade has n distinct points and she want to know how many non-empty subset of these points is good. You need to output the answer module 998244353
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标签： HBC17423vcd题解
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