func computeMonteCarlo(iterations: Int) {
DispatchQueue.concurrentPerform(iterations: iterations) { _ in
let (x, y) = (drand48() * 2 - 1, drand48() * 2 - 1)
let point = UIView(frame: CGRect(x: 3 * (x + 1) * 50, y: 3 * (y + 1) * 50, width: 3, height: 3))
if x * x + y * y <= 1 {
nPointsInside += 1
point.backgroundColor = UIColor.red
} else {
point.backgroundColor = UIColor.blue
}
DispatchQueue.main.async {
self.monteCarloGraph.addSubview(point)
}
}
}