The problem is NOT clear

  • 0

    See if inputs are as follows:
    the result should be (4*3)/2.
    Generally speaking, n is the number of duplicate elements, for k == 0, it should be n * (n-1) / 2

  • 0

    Shouldn't you then also say that the result of the first example should be 4 instead of 2? In other words, I think example 1 shows that you're wrong.

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