darioielardi

import 'dart:math';

class Quick {

  void swap(List<int> arr, int i, int j) {
    var temp = arr[i];
    arr[i] = arr[j];
    arr[j] = temp;
  }

darioielardi

class Singleton {
  	
  Singleton._internal();
  
  static final Singleton _singleton = new Singleton._internal();
  
  factory Singleton() => _singleton;
}