Given a vector of real numbers x, find the index idx of n th maximum value. If nth maximum occurs more than once, return the indices of all those occurences.

Example 1:

Input: x = [2 4.5 3 1 3.33], n = 4

Output: idx = 1, since 4th maximum is 2

Example 2: Input: x = [2 4.5 3.33 3 1 3.33], n = 2

Output: idx = [3 6], since 2nd maximum is 3.33

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