I recently tried the (medium) problem WORDS1 (Play on Words).
I tried to solve the problem but I kept getting TLE. My program works for all test cases I have tried till now. So I thought of taking a look at someone else’s solution. Most solutions were badly written (short identifiers, no comments, irreguar indentation). But this one:
seemed good. But after analysing it, It seemed wrong to me. To be sure, I copied the code, compiled it and ran it (without editing).
But that program outputs “The door cannot be opened.” instead of “Ordering is possible.” for the input
4 bc de ab cd
This is wrong since the input can be reordered to “ab bc cd de”.
How was this submission accepted?
I’m new to data structures and algorithms, so I wouldn’t know if this problem uses a well-known complicated data structure or a difficult algorithm. Please give me some hints. I’ve been trying this problem for 3 days.