Santa gifts

app.cs

class Program
{
    static void Main(string[] args)
    {
        var children = new List<Child> { new Child("Hudo", true), new Child("Genna", true), new Child("Calippio", false), new Child("Javier", false), new Child("Cristian", true)};
        var presents = new List<Present> { new Present("Tannoy speakers", 2), new Present("Candy", 1)};

        presents
            .SelectMany(x => Enumerable.Range(1, x.Quantity).Select(c => new Present(x.Name, 1)))
            .Zip(children.Where(x => x.WasGood), (present, child) => new Assignment(child.Name, present.Name))
            .Select(x => x.ToString())
            .ToList().ForEach(Console.WriteLine);
    }

  
    struct Child
    {
        public Child(string name, bool wasGood)
        {
            Name = name;
            WasGood = wasGood;
        }

        public string Name;
        public bool WasGood;
    }

    struct Present
    {
        public Present(string name, int quantity)
        {
            Name = name;
            Quantity = quantity;
        }

        public string Name;
        public int Quantity;
    }

    struct Assignment
    {
        public Assignment(string name, string present)
        {
            Name = name;
            Present = present;
        }

        string Name;
        string Present;

        public override string ToString()
        {
            return $"{Name} gets {Present}";
        }
    }
}

/*
Given a list of children { name:string, wasGood:boolean
}
And a list of presents { name:string, quantity:number } 
Santa needs you to write an assignPresents function that will return a list of present assignments { childName, presentName }.
Bad children get no present(are not in the results).
For example:
children =
[ { name: "Bart"    , wasGood: false }
, { name: "Milhouse", wasGood: true  }
, { name: "Lisa"    , wasGood: true  }
, { name: "Maggie"  , wasGood: true  }
]
presents =
[ { name: "Stacy Malibu doll"          , quantity: 2 }
, { name: "Cursed Krusty action-figure", quantity: 5 }
]
assign(children, presents) =
[ { childName: "Milhouse", presentName: "Stacy Malibu doll" }
, { childName: "Lisa"    , presentName: "Stacy Malibu doll" }
, { childName: "Maggie"  , presentName: "Cursed Krusty action-figure" }
]


Of course, Santa hates mutation(and mutants), so both children and presents must remain unchanged after calling assignPresents

(assignment is not random, if the first present has quantity Q just give that present to the first Q (good) children)
*/