Hi everybody. I am learning about sqgment tree, so I want some problems on Codeforces to practise. Can you give me?

I'm 17 years old and I'm learning about coding. So I want to know how to code faster and more effectively? Help me, please!!!!

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Hi everybody. I'm learning about SQRT decomposition and I want some problems. Can you give me? Thanks very much. ♥♦♣♠

Hi everybody. I'm learning about KMP. I want some KMP problems on Codeforces. Give me some. Thanks!!!