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[Help] Count number of integers from 1 to n can be represented as ax + by with given positive integers n,a,b and x,y must be natural numbers
Given $$$n, a, b$$$ are all positive numbers $$$(1 \le a, b, n \le 10^{18})$$$.
Count how many numbers from $$$1$$$ to $$$n$$$ that can be represented as $$$a\times x + b\times y$$$ with $$$x,y \ge 0$$$ are arbitrarily non-negative integers.
I only know a $$$O(\sqrt{n})$$$ algorithm.
Thanks.
