Hello , i got stuck with the problem of dp where , i was not able to build dp state ? Link of the problem is https://atcoder.jp/contests/abc122/tasks/abc122_d
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Keep the position and last three letters in the dp state. For each new letter, check if old three letters + new letter doesn't violate the rules. Then you can calculate the dp easily. I would prefer to implement recursively as it looks like a dfs.
it seem like good solution , thanks .