InterviewBit Problems   Remove Element from Array : Solved

About the Remove Element from Array : Solved category (1)
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Can someone explain what's wrong in this solution except time complexity? I'm not getting same output (2)
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Why the Binary search can't take place , as the question ask to do it in less than O(n) (2)
O(n) time complexity and O(1) space complexity by me in C++ (1)
[C++][Remove Element from Array] using iterators (1)
O(n) Time C++ Solution w/ O(1) Space [Simple] (1)
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