InterviewBit Problems   Number of 1 Bits : Unsolved

About the Number of 1 Bits : Unsolved category (1)
Why this solution is not working? Time limit exceeding (1)
Simple C++ solution easy to understand code (1)
Why is this not accepted? (7)
Java Solution using AND(&) bitwise operator (1)
C++ solution with explanation (1)
What's wrong in this?Pls help (2)
VV Easy C++ solution! (1)
Whats wrong in this methhod? (3)
Just divide by 2 if remainder is '1' increment (1)
What exactly is input here? (3)
Uses g++ compiler inside (2)