InterviewBit Problems   Partitions : Unsolved

About the Partitions : Unsolved category (1)
I understood nlog(n) approach but I don't understand why it works. Can someone help me Understand (1)
Wrong output for C language solution (2)
Test case problem 12303 (1)
Why this is wrong? (4)
O(n) easy to understand (1)
Did not understand the logic, can someone help (4)
My brute force solution,that worked (1)
Partition solution explained-> (1)
Can any explain me the solution? (4) (1)
Explanation Video (1)
Why i+2 element? (2)
Wrong answers to testcases (1)