87 lines
2.5 KiB
Nim
87 lines
2.5 KiB
Nim
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# Copyright 2021 Christian Ulrich
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# usage: ./part1 < input
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import sequtils
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import strutils
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type
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Cell = tuple[val: uint8, checked: bool]
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Board = array[5, array[5, Cell]]
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iterator lines(board: Board): array[5, Cell] =
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for i in 0 .. high(Board):
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yield board[i]
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iterator columns(board: Board): array[5, Cell] =
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for i in 0 .. high(board[0]):
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var column: array[5, Cell]
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for j in 0 .. high(Board):
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column[j] = board[j][i]
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yield column
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proc check(board: var Board, val: uint8) =
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for i in 0 .. high(Board):
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for cellIndex, cell in board[i].pairs():
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if cell.val == val:
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board[i][cellIndex].checked = true
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proc readDrawnNumbers(): seq[uint8] =
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result = readLine(stdin).split(',').mapIt(uint8(parseUint(it)))
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proc readBoards(): seq[Board] =
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var
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line: string
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board: Board
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while true:
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if not readLine(stdin, line):
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return
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for i in 0 .. high(Board):
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if not readLine(stdin, line):
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return
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board[i][0 .. high(Board)] = line.splitWhitespace(4)
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.mapIt((uint8(parseUint(it)), false))
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result.add(board)
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proc bingoScore(board: Board, latestNumber: uint8): int =
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var unmarkedSum = 0
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for line in board.lines():
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unmarkedSum.inc(line.foldl(if not b.checked: a + int(b.val) else: a, 0))
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result = unmarkedSum * int(latestNumber)
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proc bingo(): int =
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let drawnNumbers = readDrawnNumbers()
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var boards = readBoards()
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for number in drawnNumbers:
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for board in boards.mitems():
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board.check(number)
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for line in board.lines():
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if line.allIt(it.checked):
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return board.bingoScore(number)
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for column in board.columns():
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if column.allIt(it.checked):
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return board.bingoScore(number)
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proc main(): int =
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try:
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echo bingo()
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except Exception as error:
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echo error.msg
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result = -1
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when isMainModule:
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quit(main())
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