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row = ceil((k-n)/double(m-1));
First rule of float numbers: never use float numbers.
row = (k-n + (m-2)) / (m-1);
This gives accepted. http://codeforces.com/contest/976/submission/37799166
P.S. not sure why it gives AC in C++17. Better optimizatior, maybe.
Thank you , i got it now , that case is not picking up all the precisions and so ceiling was not working there , so integer ceiling or using a long double instead of double gives AC. Thanks a lot , lesson learned :)
I actually wasn't exaggerating: never use double unless it's printf function and problem except a float answer. Almost all of the problem (on your and mine level at least) can be solved without float numbers, and you won't get a lot of problems using them. Just an advice, ofc.