day18, struggling

day18/notes.org

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+#+title: Notes
+* part 2 and i'm struggling.
+maybe i need to mark 'inside' cells while i dig?
+i don't know which is 'outside' from the getgo?
+
+if i mark 'all the rightside', will that help to calculate inside?
+* well, if we dont' have instruction with steps:1 i can just count points above and belove the line
+without more complicated things
+
+just count 'seenUp' and 'seenDown' if equal - then we changed side
+
+and - we shouldn't have 'step1' because all numbers are soooo big.
+
+ok. let's do that? with maps of cols.
+** CANCELLED add map[row]map[col]any
+** CANCELLED separate method to set it up after we have all of the BorderCellCols
+** CANCELLED during digInsides on each consecutive - check above and below and count
+when there's a jump - compare counts, to make decision on whether to switch 'isInside'
+** no. just because they are long doesn't mean they won't ever get one near another
+* another idea is to save | and corners, as if we're going from left to right
+this seems reasonable.
+** TODO i guess []SpecialSymbol which has Col and Symbol
+** TODO then different logic on border building.
+if U \ D - on all but last add '|'
+on last - calc with the next turn, what should be saved 'as if traversing from the left'
+
+for L \ R - on last - calc what the turn was