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The editorial is empty. Don't waste your submission on it.
This is a very poor puzzle, for the simple reason that there does not seem to be an elegant solution for it. Just brute-force it.
So the solution is very easy, but the implementation is very tedious and boring.
In some test cases, they use "X" in place of "+".
These is not consistent
marked as medium with only 30 points, are you kidding :/
If people didn't got the clue, then this one is hard. I personally think this one is hard.