52 lines
2.0 KiB
Org Mode
52 lines
2.0 KiB
Org Mode
#+title: Notes
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* part 2 and i'm struggling.
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maybe i need to mark 'inside' cells while i dig?
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i don't know which is 'outside' from the getgo?
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if i mark 'all the rightside', will that help to calculate inside?
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* well, if we dont' have instruction with steps:1 i can just count points above and belove the line
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without more complicated things
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just count 'seenUp' and 'seenDown' if equal - then we changed side
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and - we shouldn't have 'step1' because all numbers are soooo big.
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ok. let's do that? with maps of cols.
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** CANCELLED add map[row]map[col]any
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** CANCELLED separate method to set it up after we have all of the BorderCellCols
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** CANCELLED during digInsides on each consecutive - check above and below and count
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when there's a jump - compare counts, to make decision on whether to switch 'isInside'
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** no. just because they are long doesn't mean they won't ever get one near another
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* another idea is to save | and corners, as if we're going from left to right
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this seems reasonable.
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** DONE i guess []SpecialSymbol which has Col and Symbol
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** DONE no, let's make it map. yes will have to init, but yuck anyway
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** TODO then different logic on border building.
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if U \ D - on all but last add '|'
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on last - calc with the next turn, what should be saved 'as if traversing from the left'
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for L \ R - on last - calc what the turn was
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** TODO !! between last and first movement the corner is unknown.
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so, copy the first instruction to the end?
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** moment of hope.
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my calculation for example input for part 2
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day18 result: 952408144115
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952408144115
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*** YES.
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*** about 1M for 4 minutes
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** so, my input is ~16M rows
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3.5 seconds per 10k
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** well, maybe i can parallel.
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*** parallel example
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day18 result: 952407566854
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*** and with separate done channel from the summing goroutine
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952408144115
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**** YES
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** and
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2023/12/18 23:35:31 border is 195341588; inside is 148441957805559
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2023/12/18 23:35:31
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day18 result: 148442153147147
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* i should have used a formula. maybe then it would taken less than 4 hours
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