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nice problem. found a method to compute F(m,n) in O((n/m)^2) time which causes it to run instantly
I'm using Java and have the problem, that the test cases except the first one always run out of time (>4s). I optimized my algorithm, now I can run 10^6 times a difficult input in time:
Still the test cases don't finish..
I don't get what's different in these..
Any hints or ideas what I'm missing? I really got stuck here..
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