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Beryllium 2013

Start date: Sept. 6, 2013, 4 p.m. UTC
Calculate the number of pairs (P, S) such that {A[0], ..., A[P]} = {A[S], ..., A[N-1]}.

Stats:

3237 started 617 silver awards 146 golden awards

Hall of fame:

1
Chenyang Wu
Time: 47 minutes
2
Denis Yudin
Time: 55 minutes
3
Xiongjun Liang
Time: 1 hour, 8 minutes