My code for the problem https://mirror.codeforces.com/problemset/problem/682/D gets a TLE, Please can someone help me in figuring it out the reason? Genrally solutions involve 4D DP but I tried solving it using 3D DP. Thanks in advance. Link to my code- https://mirror.codeforces.com/contest/682/submission/127054863

This is to seek help from Experienced people on how to Improve,I have been regularly solving problrms from a long time now and I do try to appear In virtual contests almost daily. So is there some mistake in my practising strategy. If so please help me out. You may visit my profile for reference. thanks in advance.

Just wrote a recursive code and memoised it,sample test cases do pass but memory limit exceeds in test 4. please help,thanks in advance:). link to my code:https://mirror.codeforces.com/contest/545/submission/94629751.