Fast modular linear congruence solver #27
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Implements a fast linear congruence solver mod 2^n, exploiting a bunch of ways to make things faster when the modulus is a power of two.
a % MOD==a & (MOD - 1)gcd(a, MOD)==1 << tzcnt(a)gcd(a, MOD)anda*x == gcd(a, MOD), sinceMOD*ysimplifies to zero. The latter is solved using the fast modular multiplicative inverse algorithm