Brush number of questions: 4
Today saw the combination of inclusion and exclusion count + + Mobius function, advanced algorithm contest Guide 169 ~ 179
Combination count https://www.cnblogs.com/2462478392Lee/p/11328938.html
to sum up
Today played a Team cf training, she has found its own mistake, why after a sample is also wa1, they wanted to look at input% lld and% d! ! !