Editorial for Đánh Máy
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.
Subtask 1
- Duyệt trâu, xét mọi cặp xâu, đếm số cặp xâu thỏa mãn.
Subtask 2
- Sử dụng kĩ thuật Cây tiền tố (Cây Trie) để tối ưu bài toán.
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