Hi I recently learned about tries and tried this question---- http://codeforces.net/contest/514/problem/C this is my solution to problem ---- http://codeforces.net/contest/514/submission/12742436 I would be glad if someone could take some time and explain what might be wrong with the solution , I have tried to add necessary comments to explain my approach.

PS- I was successful in solving this question using polynomial hashing but wanted to solve this using tries.

Thanks in advance.