**Input Format:** - First line contains an integer **N** (1 <= N <= 10^6), the size of the array.- Second line contains **N** integers **a[i]** (1 <= a[i] <= N ...

Explanation: Total number of unique elements are 3, i.e[1,2,3] and Therefore return 3 after assigning [1,2,3] in the beginning of the array. Explanation: Total number of unique elements are 4, i.e[1,2 ...

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