Question here:
https://atcoder.jp/contests/abc239/tasks/abc239_d
The question for the limits is brute but what is the approach if all a,b,c,d can be upto 10**5. I could not figure anything out on that case. Please help me
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The maximal prime gap upto $$$2\times 10^5$$$ is about $$$100$$$. So if $$$D-C$$$ is greater than this gap, the second player wins. Otherwise brute force to find the answer.
thats genius. Thank you