InterviewBit Problems   Zigzag String : Unsolved

About the Zigzag String : Unsolved category (1)
Some one please tell the mistake (1)
ZigZag string question (1)
Ambiguity in Zigzag Tester (5)
Memory Limit Exceeded without dynamic Allocation (2)
Corret output but still not accepted (2)
WA even though answer is writeyour comment (1)
Got the same output as expected for PAYPALISHIRING still getting it wrong (5)
Solution with Time Complexity of O(n*stringlength) is accepted (1)
WA even though answer is write (4)
Question unclear (3)
What is wrong with my solution (1)
Online Compile Not Working Properly (1)
MLE by using just one string of length same as input string? (1)
What the heck is this? (1)
Getting extra space at the end of custom input string (1)
Unable to Understand (1)
Something wrong with tester (2)
WA on submission (1)
Solved:Problem of getting WA for correct output (2)
Complier's Fault or mine (1)