You could use something like
(x_1, i_1), (x_2, i_2), ..., (x_k,i_k), ... (first k tuples of value, index)
with x_n >= x_m for every n < m (tuples must be ordered by value)
than use the i index numbers from the tuples
edit: just saw there is a similar approach to this with sets in another comment.
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