YosiefAhmed's blog

By YosiefAhmed, history, 21 month(s) ago, In English

How i can learn from such as this problem 1705D - Марк и лампочки

I need help.

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21 month(s) ago, # |
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This kind of problems is required to find any observations so the only way to be good in this is practice. Solve more such problems.