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On Monogon → Codeforces Global Round 12, 6 years ago
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Thanks for the reference, I also remember the similar problem but could not find it.
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I use Python for the first few contests. As you may know, the TOP masters all use cpp and it is much faster. So maybe think in Python first and then 'translated' into cpp. After some time it will be easy to direct use cpp for contests.
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Nice tutorial and problem set. Thank you.