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##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
Boolean 2D DP
Define = true if matches .
Base cases: (empty matches empty), if is all '*' (stars can match empty), and for (non-empty string can't match empty pattern).
The '*' transition is the tricky part: it can match zero characters () or one-or-more characters ().
