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1052008dotrungkien
2 năm trước
Giả sử có n x n ô vuông được tô tối đa k màu. Hỏi có bao nhiêu khả năng tô màu? Nếu đặt hàm f(n,k) thì f(n,k) chính là số dư của khả năng tô màu cần tìm chia cho 10^9 + 7. Ví dụ f(1,17)=17, f(17,1)=1, f(2,2)=6, f(2,3)=24, f(3,2)=140. Bạn nào có thể tìm được cách tính của hàm f(n,k) giúp mình với.
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