Naive day5 solution
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@ -8,5 +8,5 @@ proc solve_for_day(n: int) {.used.} =
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echo solvers[n]()
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when isMainModule:
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solve_all()
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# solve_for_day(4)
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# solve_all()
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solve_for_day(5)
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30
2020/src/day5.nim
Normal file
30
2020/src/day5.nim
Normal file
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@ -0,0 +1,30 @@
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import streams, bitops, sets
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# TODO: this one needs some refining for sure
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proc row(l: string): uint64 =
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for c in l:
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result = result.rotateLeftBits(1)
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if c == 'B': result.setBit(0)
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proc col(l: string): uint64 =
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for c in l:
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result = result.rotateLeftBits(1)
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if c == 'R': result.setBit(0)
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# do I really need row * 8 + col or can I just keep rotating and shifting
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proc toId(row: uint64, col: uint64): uint64 = (row*8)+col
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proc part1*(s: Stream): int =
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for l in s.lines():
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let id = cast[int](toId(row(l[0 .. 6]), col(l[7 .. ^1])))
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if id > result: result = id
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proc part2*(s: Stream): int =
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var ids = initHashSet[int]()
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for l in s.lines():
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let id = cast[int](toId(row(l[0 .. 6]), col(l[7 .. ^1])))
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ids.incl(id)
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for i in 1..890:
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if ids.contains(i+1) and ids.contains(i-1) and not ids.contains(i):
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return i
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@ -3,7 +3,7 @@ import input_requestor, os, macros, strformat, tables
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macro loadDays(): untyped =
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var solver_str = "var solvers = {\n"
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result = newStmtList()
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for day in 1..4:
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for day in 1..5:
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let module = fmt"day{day}"
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if fileExists joinPath("src/", &"{module}.nim"):
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result.add parseStmt fmt"from {module} import nil"
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