InterviewBit Problems   Longest Common Subsequence : Unsolved

About the Longest Common Subsequence : Unsolved category (1)
I am getting runtime error only on this platform ..can someone resolve the issue in my is working fine on local edtior and GFG (2)
Why are we taking 2d array we can store sequence in simple vector or 1D array (2)
Can be derived from LCS, LPS => LCS (A, reverse(A)) (2)
If Top down gives tle, pass string by reference (3)
Top down TLE ? Go for Bottom up! (4)
REQUEST for important link (1)
I used array instead of vector, but it is not working for large test cases, why? (5)