オフラインリアルタイムどう書くE12 の 回答

参加して解きました。

各行の最大高さを覚えて、どこで止まるかを計算しています。

e12.rb

def get_stop_point( board, mino, right )
  mino.map { |w_offset, h_offset, height|
    board[right + w_offset] - h_offset
  }.max
end

def update_board( board, mino, right, stop )
  mino.each { |w_offset, h_offset, height|
    board[right + w_offset] = stop + h_offset + height
  }
end

def solve(input)
  board = Hash.new(0)
  input.scan( /(\d+)([ILOST])/ ) { |right, c|
    right = right.to_i
    mino = {
      'I' => [
        [ 0, 0, 4, ],
      ],
      'L' => [
        [ 0, 0, 3, ],
        [ 1, 0, 1, ],
      ],
      'O' => [
        [ 0, 0, 2, ],
        [ 1, 0, 2, ],
      ],
      'S' => [
        [ 0, 0, 1, ],
        [ 1, 0, 2, ],
        [ 2, 1, 1, ],
      ],
      'T' => [
        [ 0, 1, 1, ],
        [ 1, 0, 2, ],
        [ 2, 1, 1, ],
      ],
    }[c]
    stop = get_stop_point( board, mino, right )
    update_board( board, mino, right, stop )
  }
  board.values.max.to_s
end

def test(input, answer)
  result = solve(input)
  if result != answer then
    puts 'NG: input = %s, answer = %s, result = %s' % [input, answer, result,]
    exit 1
  else
    puts 'OK: input = %s, answer = %s' % [input, answer,]
  end
end


test("1O3L0I0T", "5")
test("0I", "4")
test("0I0I", "8")
test("0I1I2I3I4I", "4")
test("0S0I", "5")
test("0I0S", "6")
test("2S0T2O3I", "8")
test("4O4T1T0S4L1L3L", "10")
test("0S2S4S6S8S10S12S14S", "16")
test("14S12S10S8S6S4S2S0S", "2")
test("5I2O10I0O4L10T9T11L8I2I10I12O7L12T12T12S11T9O10O13I12O10O7I9I7O0S1O2S0L1L", "23")
test("9T14L10L8T4I1T3S5I8T12O3S7L9O7L14T2I7O3S6S2L0L13T10O4I9T7L8S0I12O9S11L11T14T", "27")
test("9S9S7O11O16I2T9O12L10T9O0O13I9O1I2T14S7O9S11T5L7I14T13O0T12I3S10L10O7I15I6S2L12S8I16I3L", "23")
test("11T13I16S15T7O10L12S1I5I8S5I13I15O8S9I1T12I1S5S0L14I12L16T2S2S8L2S14L16O4I13L15L13S11S9T13S9S3L6O", "22")
test("12L10S7I5L14T12S9L1T14I0I5L1T2O18T9L0I15I16L10S1O15I0L17O5L18T4I18L7L7I13I3I12I2S3T5T3S16L14S14O11O15T14S", "17")
test("0S18S2S19I14T7L14L2L6I9I0L4I5L13L15I8S8T2I5I7O18T3S1T7I2L8O0S20T9I14T5L5I1T4L9O8T19T5S12O16T19L4O10O10T14L", "24")
test("7T5L6S4S8T6S10I19O20L14I18L21S7I11S11O1L13T20O9I7L2T8L2S20L3O14L9T17I8L8S14I6T2O11T21O18O6T15T1S3L6O19S18O20S19O16T6S14T", "26")
test("18S2I4S16L13S17I21O8I17T8I14O12T20I20S19S16S13T12T20I22I15O2I2I8I2S18I9I9T6O13O13L17I2L20L2L4I9I19O11T3S10O2S18T12I5O11S19O21S6I17T17S", "26")
test("11L5S0T22S18O13T2O22S15I12I21T16I3I1I22L11L11L22O13S24S15L13T15S19L10O15T7S24T19L0T13O11I12T13S4I24L15O3S19O10L19O0S20L7O11L21I22S18T19T23O8I22S24L0S", "21")
test("7L7I11T7S18O17L8S15L9I3O24S3O1O5O14L9T13S2O25S22T10T8L24S18S13T1O1L6I10I4S13O3S7L10T1T4L17S20I18O15S25S23S21I19T6O24S9L2O2O15L12L8L8O18I18L0T5O", "31")
test("999I999I999I999I999I999I999I999I999I999I999I", "44")