A round of Blackjack has ended and it's time to reveal the winner. Use the following two rules to determine the outcome of the round:
You are given a int points, where points[i] is the number of points received by the i-th player. If there is exactly one winner, return the 0-based index of the winning player. Otherwise, return -1.
|-||points will contain between 1 and 50 elements, inclusive.|
|-||Each element of points will be between 1 and 35, inclusive.|