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An easy problem Time Limit : 6000/3000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other) Problem Description When Teddy was a child , he was always thinking about some simple math problems

Ignatius and the Princess III Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 65536/32768K (Java/Other) Problem Description "Well, it seems the first problem is too easy. I will let you kno

RXD and math Problem Description RXD is a good mathematician. One day he wants to calculate: ∑i=1nkμ2(i)×⌊nki−−−√⌋ output the answer module 109+7. 1≤n,k≤1018 μ(n)=1(n=1) μ(n)=(−1