🛠️ How It Works: The code iterates through the array and tracks seen elements using a set (seen). If an element appears more than once, it is added to a duplicate set (duplicateSet). The final result ...

We are Given an array of integers Arr containing N+1 integers where each integer is in the range [1, N] inclusive. Duplicate in an array of N+1 integers in C++ Algorithm : Take the size of the array ...