long long gcd(long long x, long long y) {
if (y == 0)
return x;
else
return gcd(y, x % y);
}
时间复杂度O(1),空间复杂度O(logy)
long long gcd(long long x, long long y) {
if (y == 0)
return x;
else
return gcd(y, x % y);
}
时间复杂度O(1),空间复杂度O(logy)