I have a two arrays

One is

2 5 1 6 4 3

other is

1 2 3 4 5 6.

I want to make an array X which gives the index of its element on other
arrays.

Meaning X[1] = 3  1 is element of the second array and 3 is the index of
element 1 in first array.

How shall we get array X in O(nlogn).

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