Special Problems that taught you something New

Правка en1, от abhinash6g, 2020-12-01 19:15:37

Hi! Codeforces Community. Many a times while practicing problems or in contest we get few problems that take hours of struggle but at the end leave us with something new, some brillaint concept, idea or trick. Just wanted to know about "Special Problems" that you may have come across, that had taught you something great! Please, forgive me for any mistake!

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en1 Английский abhinash6g 2020-12-01 19:15:37 413 Initial revision (published)