Minimum edit array

Question

Preferably with java or just the pseudocode is fine.
Given the integer array a = [A1, A2, ···, an]. Your task is to do a series of operations on the array to make it a non descending array: you need to select a number x for each operation, and then move all elements equal to X in the array to the beginning or end of the array. For example, array a = [2, 1, 3, 1, 1, 3, 2] can be changed into a non descending array by the following two operations:
1. Move all elements equal to 1 to the beginning of the array to get [1, 1, 1, 2, 3, 3, 2] ;
2. Move all elements equal to 3 to the end of the array to get [1, 1, 1, 2, 2, 3, 3].
Please design an algorithm to calculate the minimum number of operations required to change a given array into a non descending array

Answer 1

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