InterviewBit Problems   Balance Array : Unsolved

About the Balance Array : Unsolved category (1)
O(n) with O(1) memory (1)
Why A = [5, 5, 2, 5, 8] special value 2 in this test cases? (2)
Can anyone explain the concept? (3)
What is the problem with this code plzzzz help? (2)
Compiler for C++ isn't working (1)
What's the logic behind the approach (2)
Easy in O(n) c++ (2)
Think of linear time and constant space solution (2)
C++ solution - using prefix sum , linear space O(n) solution (1)
Can be done in O(N) Time and O(1) Auxiliary Space very easily (1)
Using prefix sum and suffix Sum intutive c++ solution (1)
Simple O(n) Solution C++ Using Prefix Sum (1)
C++ Solution Partially correct (2)