ࠓ೔ͷ”Ͳ͏ॻ͘”໰୊ͷ ΞϧΰϦζϜྫ 2019/04/17 #nagoyaphp @ttskch

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͖ͨͭͪʢ໊͋ͩʣ • (ג)ΧϧςοτίϛϡχέʔγϣϯζCTO • WebΤϯδχΞྺ7೥ɺPHPྺ7೥ • #nagoyaphpʊ • #symfony_meetup

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We are hiring!ʢϚδͰʣ • ࣗࣾαʔϏεʮLisketʯͰࣗࣾͷۀ຿΋ޮ཰Խ • શࣾһͷฏۉ࢒ۀ͕࣌ؒ5h/݄͙Β͍Ͱ͢ ಛผ৆ड৆

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We are hiring!ʢϚδͰʣ ·ͣ͸͓࿩͚ͩͰ΋ʂؾܰʹ੠͔͚͍ͯͩ͘͞

ࠓ೔ͷ”Ͳ͏ॻ͘”໰୊ͷ ΞϧΰϦζϜྫ 2019/04/17 #nagoyaphp @ttskch

http://nabetani.sakura.ne.jp/hena/ordf04octsp/

௖఺਺ͷٻΊํ

1 2 4 8 16 32 64 128

3 5 4 4

3 5 4 4 1 2 3 2

1 2 3 2 3 5 4 4 ؔ܎ͯͦ͠͏

3 5 4 4 1 2 3 2

3 5 4 4 1 2 3 2 3 -1 = 2

3 5 4 4 1 2 3 2 2 + 3 = 5 3 -1 = 2

3 5 4 4 1 2 3 2

3 5 4 4 1 2 3 2 2 -1 = 1

3 5 4 4 1 2 3 2 1 + 3 = 4 2 -1 = 1

3 5 4 4 ࣮ઢؒͷڑ཭͔Β௖఺਺͸ٻΊΒΕΔ

5

5 4

5 4 4 -1 = 3

5 4 3 + 3 = 6 4 -1 = 3

5 4 4 -1 = 3 3 + 3 = 6 3 + 2= 5

5 4 ڑ཭͕4ͷͱ͖͚ͩܭࢉํ๏͕มΘΔ

1 2 4 8 16 32 64 128

2 8 16 64 1 2 3 2 1 4 32 128

21 23 24 26 1 2 3 2 20 22 25 27

21 23 24 26 1 2 3 2 20 22 25 27

21 23 24 26 1 2 3 2 20 22 25 27 ൪߸Λ2ͷྦྷ৐Ͱද͢ͱࢦ਺෦ͷࠩͰڑ཭ΛٻΊΒΕΔ

21 23 24 26 2 3 2 22 25 Ұप͢Δͱۙͮ͘ߏ଄ͳͷͰ8ͷ৒༨Λ࢖͑͹Αͦ͞͏✋ 1 20 27

ೖྗͷύʔε

1 2 4 8 16 32 64 128

2 8 16 64 165 Λ 1 + 4 + 32 + 128 ʹ෼ղ͍ͨ͠ 1 4 32 128

2 8 16 64 1 4 32 128

21 23 24 26 20 22 25 27

165 = 27x1 + 26x0 + 25x1 + 24x0 + 23x0 + 22x1 + 21x0 + 20x1 21 23 24 26 20 22 25 27

165 = b10100101 21 23 24 26 20 22 25 27

21 23 24 26 20 22 25 27 ೖྗΛ2ਐ਺Ͱද͢ͱɺ஋͕1ͷܻ͕࣮ઢͷҐஔΛࣔ͢

࣮૷ྫ

public function run(string $input): string { $lines = array_values(array_filter(range(0, 7), function (int $i) use ($input) { return str_split(sprintf('%b', $input))[$i] ?? false; })); $vertices = []; for ($i = 0; $i < count($lines); $i++) { $distance = ($lines[($i + 1) % count($lines)] - $lines[$i] + 8) % 8; $vertices[] = ($distance === 4 ? 2 : 3) + $distance - 1; } sort($vertices); return implode('', $vertices); }

public function run(string $input): string { $lines = array_values(array_filter(range(0, 7), function (int $i) use ($input) { return str_split(sprintf('%b', $input))[$i] ?? false; })); $vertices = []; for ($i = 0; $i < count($lines); $i++) { $distance = ($lines[($i + 1) % count($lines)] - $lines[$i] + 8) % 8; $vertices[] = ($distance === 4 ? 2 : 3) + $distance - 1; } sort($vertices); return implode('', $vertices); } ೖྗΛ2ਐ਺ʹม׵ͯ͠ɺཱ͍ͬͯΔϏοτͷҐஔʢ0ʙ7ʣΛ഑ྻʹ͢Δɻ ྫ୊ͷ৔߹͸ $lines === [0, 2, 5, 7] ͱͳΔɻ͜Ε͕࣮ઢͷҐஔɻ ೖྗͷύʔε

public function run(string $input): string { $lines = array_values(array_filter(range(0, 7), function (int $i) use ($input) { return str_split(sprintf('%b', $input))[$i] ?? false; })); $vertices = []; for ($i = 0; $i < count($lines); $i++) { $distance = ($lines[($i + 1) % count($lines)] - $lines[$i] + 8) % 8; $vertices[] = ($distance === 4 ? 2 : 3) + $distance - 1; } sort($vertices); return implode('', $vertices); } [0, 2, 5, 7] ͱ͍͏഑ྻʹରͯ͠ɺཁૉؒͷ͔ࠩΒ࣮ઢؒͷڑ཭ΛٻΊΔͱɺ (2-0+8)%8=2, (5-2+8)%8=3, (7-5+8)%8=2, (0-7+8)%8=1 ͱͳΔɻ ڑ཭͕4ͷ৔߹͸ 2+ڑ཭-1 ͕ɺڑ཭͕ͦΕҎ֎ͷ৔߹͸ 3+ڑ཭-1 ͕௖఺਺ɻ ௖఺਺ͷܭࢉ

https://github.com/ ttskch/nagoyaphp15

@ttskch ʘThanks!ʗ