Created
July 27, 2021 13:52
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Problem 743
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| def A(k,n): | |
| total = 0 | |
| f0 = 1 | |
| modulo = 1000000007 | |
| power = pow(2, n//k, modulo) | |
| for a in range(0, n//k + 1): | |
| total = (total + (f0 * pow(power, k-2*a, modulo))) % modulo | |
| f0 = (f0*(k-2*a)*(k-2*a-1)) % modulo | |
| f0 = (f0*pow((a+1)**2, -1, modulo)) % modulo | |
| return total |
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