What's the quickest way to find all possible pairs in list?

Question

Basically I have list of players, and I want to pair them up so that each player will play everyone once. What\'s the quickest way to find this data?

Answer 1

assuming that players do not appear in the list twice, a double for loop is very quick:

for (int i=0, i <= playerList.Count - 2, i++)
    for (int j=i+1, j <= playerList.Count - 1, j++)
        //add a new pairing of player i and j