martinr448

import Foundation

@objcMembers class ClassA: NSObject, NSSecureCoding {
	var title: String
	
	init(title: String) {
		self.title = title
	}

	func encode(with aCoder: NSCoder) {

martinr448

def sum_of_products(a, n):
    running_totals = [0] * n
    for x in a:
        for i in range(n - 1):
            running_totals[i] += running_totals[i + 1] * x
        running_totals[-1] += x
    return running_totals[0]

martinr448

import Foundation

func permute<E>(i: Int, array: [E]) -> [E] {
    var i = i
    var result = array
    for j in 0..<array.count {
        let k = i % (array.count - j)
        i /= (array.count - j)
        result.swapAt(j, j + k)
    }

martinr448

def from_permutation_to_disjoints_cycles(perm):
    mappings = { a: b for a, b in zip(*perm) }
    cycles = []
    for a in perm[0]:
        b = mappings.pop(a, None)
        if b is None:
            continue # `a` has already been handled
        cycle = [a]
        while a != b:
            cycle.append(b)