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1.Use Linear Sieve to take primes no more than $$$n$$$ out, store them.
2.Use
upper_bound()
to find the position of the smallest prime strictly greater than $$$n$$$. Then we can calculate $$$\pi(n)$$$ easily.3.$$$\forall i: i\ge 0 $$$ and $$$ p_{A\times i+B} \le n$$$, store $$$p_{A\times i+B}$$$ for answer.
4.Output what you stored for answer.
I did this and got AC but I think purpose of problem setter is behind this question is not this so I asked.
There's a time constraint of $$$10$$$ seconds, with $$$1024$$$ MB memory avaliable.
I think the purpose of the author could be that ( enumerate primes )