Editorial for BINARYSTRING - Xâu nhị phân đẹp
Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.
Submitting an official solution before solving the problem yourself is a bannable offence.
Bài này ta cần đếm số lượng kí tự
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