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#!/usr/bin/env python3
TESTS = [
[12, 3, 8],
[2, 15, 17],
[456, 6, 1296],
[1234, 100, 9],
[11223344, 1000000, 142857],
[55667788, 10000000, 1000000007],
[1357, 24682468, 999999999],
[24680, 1357913579, 777777777],
[998, 1000000000000, 999],
[1234, 11111111111111, 30],
[1, 222222222222222, 123456789],
[2016, 666666666666666, 8888888888],
[11223344, 555666777888999, 1357924680],
[999999999999999967, 999999999999999877, 999999999999999989],
[123456789123456789, 123456789123456789, 987654321123456789]]
# Gọi l là "chiều dài" của x, l = int(log10(x) + 1) hay l = len(str(x))
# Đặt l ** 10 = a, dễ thấy y = x * (a**(n-1) + a**(n-2) + ... + a + 1)
# = x * (a**n - 1) / (a - 1)
# y chia m bằng k dư q hay x * (a**n - 1) / (a - 1) = k * m + q
# <=> x * (a**n - 1) = k * (a*m - a) + q * (a - 1)
# <=> q = x * (a**n - 1) % (a*m - a) / (a - 1)
with open('REMAINDER.TXT', 'w') as f:
for x, n, m in TESTS:
a = 10 ** len(str(x))
m *= a - 1
p = pow(a, n, m)
print(x * (p - 1) % m // (a - 1), file=f)
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