Referring to this problem , the answer seems to be n*n/2 - 1 (for n > 1) .

Can someone explain the intuition behind this solution, or is it just guessed by observing some small inputs and outputs?

Referring to this problem , the answer seems to be n*n/2 - 1 (for n > 1) .

Can someone explain the intuition behind this solution, or is it just guessed by observing some small inputs and outputs?

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