diff options
| -rw-r--r-- | 2020/eleven.nim | 85 | ||||
| -rw-r--r-- | 2020/input/eleven.txt | 95 |
2 files changed, 180 insertions, 0 deletions
diff --git a/2020/eleven.nim b/2020/eleven.nim new file mode 100644 index 0000000..7324b2d --- /dev/null +++ b/2020/eleven.nim @@ -0,0 +1,85 @@ +# Day Eleven: Seating System +import os, strutils, sequtils, sugar + +let input: string = paramStr(1) +var terminal: seq[seq[char]] = map(split(strip(readFile(input)), '\n'), row => @row) +let height: int = len(terminal) +let width: int = len(terminal[0]) + +while true: + var prev, future: seq[char] = @(repeat('.', width)) # dummy floor + var buffer: seq[seq[char]] = terminal + for i, row in buffer: + if height - i == 1: + future = @(repeat('.', width)) + else: + future = buffer[i+1] + for j, seat in row: + let threshold: int = + if j == 0: + count(prev[j..j+1], '#') + count($row[j+1], "#") + count(future[j..j+1], '#') + elif j == width - 1: + count(prev[j-1..j], '#') + count($row[j-1], "#") + count(future[j-1..j], '#') + else: + count(prev[j-1..j+1], '#') + count($row[j-1], "#") + + count($row[j+1], "#") + count(future[j-1..j+1], '#') + if seat == '#' and threshold >= 4: + buffer[i][j] = 'L' + elif seat == 'L' and threshold == 0: + buffer[i][j] = '#' + prev = row + if terminal == buffer: break + terminal = buffer +echo count($terminal, '#') + +terminal = map(split(strip(readFile(input)), '\n'), row => @row) +while true: + var prev, future: seq[char] = @(repeat('.', width)) # dummy floor + var buffer: seq[seq[char]] = terminal + for i, row in buffer: + if height - i == 1: + future = @(repeat('.', width)) + else: + future = buffer[i+1] + for j, seat in row: + var threshold: int = 0 + # left + for k in countdown(j-1, 0): + if terminal[i][k] == '#': inc(threshold) + if terminal[i][k] != '.': break + # right + for k in j+1 .. width - 1: + if terminal[i][k] == '#': inc(threshold) + if terminal[i][k] != '.': break + # up + for k in countdown(i-1, 0): + if terminal[k][j] == '#': inc(threshold) + if terminal[k][j] != '.': break + # down + for k in i+1 .. height - 1: + if terminal[k][j] == '#': inc(threshold) + if terminal[k][j] != '.': break + # down-left + for k in 1 .. min(i, j): + if terminal[i-k][j-k] == '#': inc(threshold) + if terminal[i-k][j-k] != '.': break + # up-left + for k in 1 .. min(height-1-i, j): + if terminal[i+k][j-k] == '#': inc(threshold) + if terminal[i+k][j-k] != '.': break + # down-right + for k in 1 .. min(i, width-1-j): + if terminal[i-k][j+k] == '#': inc(threshold) + if terminal[i-k][j+k] != '.': break + # up-right + for k in 1 .. min(height-1-i, width-1-j): + if terminal[i+k][j+k] == '#': inc(threshold) + if terminal[i+k][j+k] != '.': break + if seat == '#' and threshold >= 5: + buffer[i][j] = 'L' + elif seat == 'L' and threshold == 0: + buffer[i][j] = '#' + prev = row + if terminal == buffer: break + terminal = buffer +echo count($terminal, '#') diff --git a/2020/input/eleven.txt b/2020/input/eleven.txt new file mode 100644 index 0000000..1930bda --- /dev/null +++ b/2020/input/eleven.txt @@ -0,0 +1,95 @@ 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