rougier

def binomial(n, k):
    """
    A fast way to calculate binomial coefficients by Andrew Dalke.
    See http://stackoverflow.com/questions/3025162/statistics-combinations-in-python
    """
    if 0 <= k <= n:
        ntok = 1
        ktok = 1
        for t in xrange(1, min(k, n - k) + 1):
            ntok *= n

erica

#if os(Linux)
    import Glibc
#else
    import Darwin
#endif

// Still not lovely but tested under OS X Swift 3 and Linux Swift 3

// Use fopen/fwrite to output string
func writeStringToFile(string: String, path: String) -> Bool {