You and a friend are playing a best-of-three series (first to win 2 games wins the series). You are a stronger player and have a
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A matrix is diagonal if
In other words, you want non-zero elements only when the indices of the row and the column are the same: the first element of the first row must be non zero, the second element of the second row must be non-zero, and so on. All other elements must be zero.