IOPC 15 I : approach to solve

general
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No, I am not asking for the specific question’s answer. I am asking for ways to learn how to crack such problems. I know, it’s a deal of practice but the real question is where? Where do I attain algorithmic thinking?
The question is simple, and three fold:

  1. Where can I learn how to take fast inputs?

  2. Where do I get practice questions such as these?

  3. Why are my solutions getting WA while other solutions implementing same logic pass through?

I know it’s a generic question but it really irritates me when implementation supersedes logic in answering a question.

Thanks in advance.
Sorry if anyone is offended.

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  1. This question did not need any such fast inputs

  2. This question was very similar to : Problem - 446C - Codeforces

  3. How are people supposed to tell you the reason why you keep getting WAs without even showing us your code or telling the approach you took to solve the problem ?

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