shuffle card deck issues in language agnostic [closed]

Answer 1

A linear-time solution in C#3 for the first problem is:-

IEnumerable ProductExcept(List l, List indexes) {
    if (l.Count(i => i == 0) == 1) {
        int singleZeroProd = l.Aggregate(1, (x, y) => y != 0 ? x * y : x);
        return from i in indexes select l[i] == 0 ? singleZeroProd : 0;
    } else {
        int prod = l.Aggregate(1, (x, y) => x * y);
        return from i in indexes select prod == 0 ? 0 : prod / l[i];
    }
}

Edit: Took into account a single zero!! My last solution took me 2 minutes while I was at work so I don't feel so bad :-)