Function factorial

source/MRMesh/MRFreeFormDeformer.cpp:45–53

simple factorial func

// simple factorial func
int factorial( int n )
{
    if ( n == 0 || n == 1 )
        return 1;
    int res = n;
    for ( int i = n - 1; i > 1; --i )
        res *= i;
    return res;
}

//             n!
// C(n,k) = --------