InterviewBit Problems   REC_CMPL3 : Solved

About the REC_CMPL3 : Solved category (1)
Code nation is hiring (1)
There is a bug in this problem (2)
Simple way to understand through tree (1)
Way of looking at it (2)
Its Pretty Simple (1)
Space complexity REC_CMPL3 (1)
Solution is not fully elaborated (2)
Hopefully a good explaination (1)
Dynamic Programming at work (1)
Can anyone please explain the solution (2)