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Hello guys,
Today, I am facing a serious problem, I get idea, but I don't is it possible to do it.
Assume that, I have a number n and I want to calculate count numbers that is co-prime to n and it is also in range [L, R]
I read totient Euler but I think it won't help me ...
Thanks so much for trying to understand my poor English. :(
After reading this you should be able to solve the problem for N,L,R<=1e18
Thanks sir, let me read it :D