fast gcd
int gcd(int a, int b)
{
if (a == 0)
return b;
return gcd(b % a, a);
}
fast gcd
int gcd(int a, int b)
{
if (a == 0)
return b;
return gcd(b % a, a);
}
fast gcd
unsigned int gcd(unsigned int u, unsigned int v)
{
int shift;
if (u == 0) return v;
if (v == 0) return u;
shift = __builtin_ctz(u | v);
u >>= __builtin_ctz(u);
do {
v >>= __builtin_ctz(v);
if (u > v) {
unsigned int t = v;
v = u;
u = t;
}
v = v - u;
} while (v != 0);
return u << shift;
}Copyright © 2021 Codeinu
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