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x的y次方对p求模.
inline long long PowerMod(long long x, long long y, long long p)
{
long long result = 1;
for (;y; y /= 2, x = x * x % p) if (y&1) result = (result * x) % p;
return result;
}
UINT Fuck ( UINT a, UINT b, UINT n )
{
UINT d = 1;
while ( b )
{
if ( b & 1 ) d = ( d * a ) % n;
b >>= 1;
a = ( a * a ) % n;
}
return d;
}