Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
今日の"どう書く"問題のアルゴリズム例
Search
Takashi Kanemoto
February 13, 2019
Programming
1
440
今日の"どう書く"問題のアルゴリズム例
Nagoya.php #14 LT 資料
https://nagoyaphp.connpass.com/event/115049/
Takashi Kanemoto
February 13, 2019
Tweet
Share
More Decks by Takashi Kanemoto
See All by Takashi Kanemoto
FigmaとPHPで作る1ミリたりとも表示崩れしない最強の帳票印刷ソリューション
ttskch
43
19k
データベース/SQL超入門!完全初心者向けに世界一分かりやすく解説します
ttskch
1
3.2k
Symfony UX Autocompleteとかいう 顧客が本当に必要だったもの
ttskch
0
1.3k
就活生あるいは新人エンジニアさんへのお節介なアドバイス
ttskch
0
1.3k
symfony/pantherでWordleを解いてみた
ttskch
0
190
ついに、Webアプリでの帳票印刷のベストプラクティスを編み出しました💡
ttskch
16
18k
phpenvやめました🤦♂️
ttskch
0
740
PHPでCSVのインポート/エクスポートに立ち向かう
ttskch
1
1.8k
phpenv on Mac 難しすぎワロタ
ttskch
0
480
Other Decks in Programming
See All in Programming
Let's learn code review
riofujimon
2
430
From Spring Boot 2 to Spring Boot 3 with Java 21 and Jakarta EE
ivargrimstad
0
110
Elm Form Validation
bkuhlmann
0
510
Fragment Composition of GraphQL
quramy
7
1k
使ってみよう Azure AI Document Intelligence
kosmosebi
2
320
0→1と1→10の狭間で Javaという技術選定を振り返る/Reflecting on the Decision to Choose Java Between Scaling from 0 to 1 and 1 to 10
jaguar_imo
2
380
冗長なエラーログを削減し、スタックトレースを手に入れる / Reducing Verbose Error Logs and Obtaining Stack Traces
upamune
0
790
"config" ってなんだ? / What is "config"?
okashoi
0
240
スキーマ駆動開発による品質とスピードの両立 - 私達は何故、スキーマを書くのか
kentaroutakeda
0
170
デフォルトにして至高、RubyMineの大好きな所
ruzia
0
420
Site Reliability Engineering for GMO
pyama86
8
1k
スクラムガイドのスプリントレトロスペクティブを改めて読みかえしてみた / Re-reading the Sprint Retrospective Section in the Scrum Guide
mackey0225
3
430
Featured
See All Featured
Into the Great Unknown - MozCon
thekraken
10
1k
Debugging Ruby Performance
tmm1
70
11k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
30
6k
The Brand Is Dead. Long Live the Brand.
mthomps
49
29k
A designer walks into a library…
pauljervisheath
200
23k
Building an army of robots
kneath
300
41k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
274
13k
Rebuilding a faster, lazier Slack
samanthasiow
73
8.2k
The Pragmatic Product Professional
lauravandoore
25
5.8k
ParisWeb 2013: Learning to Love: Crash Course in Emotional UX Design
dotmariusz
104
6.6k
Gamification - CAS2011
davidbonilla
76
4.6k
5 minutes of I Can Smell Your CMS
philhawksworth
199
19k
Transcript
1 ࠓͷ”Ͳ͏ॻ͘”ͷ ΞϧΰϦζϜྫ 2019/02/13 #nagoyaphp /39
ʹ͍ͭͯ 2/39
͖ͨͭͪʢ໊͋ͩʣ 3 • (ג)ΧϧςοτίϛϡχέʔγϣϯζCTO • WebΤϯδχΞྺ7ɺPHPྺ7 • #nagoyaphpʊ • #symfony_meetup
/39
͖ͨͭͪʢ໊͋ͩʣ 4 • ͓ख͍ͨ͠ຊʢ2015/12ʣ • Schooߨࢣʢ2018/04ʣ ʮGitHubΛͬͨσϓϩΠࣗಈԽ࣮ફʯ ʮجຊ͔Β͔ͬ͠ΓֶͿ Symfony2ೖʯ /39
ͨ ͭ ͖ ͪ twitter.com/ttskch ͋͞ɺ͋ͳͨࠓ͙͢ϑΥϩʔ͠Α͏!!! શແྉ ·͞ʹ໊ݴػ ਓੜͰେͳ͜ͱɺͯ͢ ͖͔ͨͭͪΒڭΘͬͨ
͖ͨͭͪΛϑΥϩʔͨ͠Β ࠊ௧͕࣏Γ·ͨ͠ 100% φϯτʂ ϑΥϩϫʔ͔Βͷࢧ࣋ 100% ͍ͯ͠Δ ͍ͯ͠ͳ͍ ϑΥϩϫʔ͞Μ100ਓʹฉ͖·ͨ͠ ͖ͨͭͪΛϑΥϩʔ͍ͯ͠Δʁ 5/39
ձࣾʹ͍ͭͯ 6/39
(ג)Χϧςοτίϛϡχέʔγϣϯζ 7 https://quartet-communications.com /39
(ג)Χϧςοτίϛϡχέʔγϣϯζ 8 https://www.google.co.jp/search?q=Χʔςϯ /39
(ג)Χϧςοτίϛϡχέʔγϣϯζ 9 https://lisket.jp /39
We are hiring!ʢϚδͰʣ 10 • PHPer/JSer ઈࢍେืूதʂʢϦϞʔτόΠτՄʣ • Symfony+Angular ͰɺWebࠂۀքΛ
ϗϫΠτʹ͢ΔΈΛ࡞ͬͯ·͢ • ܦӦϏδϣϯʮੈքҰޮతͳཧళʯ /39
We are hiring!ʢϚδͰʣ 11 • ࣗࣾαʔϏεʮLisketʯͰࣗࣾͷۀޮԽ • શࣾһͷฏۉۀ͕࣌ؒ5h/݄͙Β͍Ͱ͢ ಛผड /39
We are hiring!ʢϚδͰʣ 12 ΤϯδχΞͷಇ͖͢͞େࣄʹͯ͠·͢✨ /39
We are hiring!ʢϚδͰʣ 13 ·͓͚ͣͩͰʂؾܰʹ͔͚͍ͯͩ͘͞ /39
14 ࠓͷ”Ͳ͏ॻ͘”ͷ ΞϧΰϦζϜྫ 2019/02/13 #nagoyaphp /39
ͷ༰ 15 http://nabetani.sakura.ne.jp/hena/orde17palin/ /39
$count = 0; for ($i = $min; $i < $max;
$i++) { $number = base_convert(strval($i), 10, $base); if ($number === strrev($number)) { $count++; } } return $count; 16 ࠷ॳʹॻ͍ͨίʔυ ۪ʹ૯ͨΓͰఆ͍ͯͭ͘͠ /39
public function dataProvider() { return [ ['12,34,5', 5], ['10,11,10', 0],
['1,100,3', 18], : : ['66160071,153732445,5', 5605], ['18799557,189007582,14', 33741], ['78547566,225312226,20', 18346], ['143084571,506549072,18', 62323], ['2099642384,2789567569,6', 14787], ]; } 17 ςετέʔε /39
݁Ռ 18 ܭࢉྔ͕େ͖͗ͯ͢λΠϜΞτ… /39
ͪΐͬͱ ಄ΛͬͯΈΔ 19/39
ਓؒͲ͏ͬͯղ͍͍ͯΔ͔ 20 ྫʣ10ਐͷ123ʙ150ͰճจΛ୳͢߹ /39
ਓؒͲ͏ͬͯղ͍͍ͯΔ͔ 20 123 ྫʣ10ਐͷ123ʙ150ͰճจΛ୳͢߹ /39
ਓؒͲ͏ͬͯղ͍͍ͯΔ͔ 20 123 131 ྫʣ10ਐͷ123ʙ150ͰճจΛ୳͢߹ /39
ਓؒͲ͏ͬͯղ͍͍ͯΔ͔ 20 123 131 141 ྫʣ10ਐͷ123ʙ150ͰճจΛ୳͢߹ /39
ਓؒͲ͏ͬͯղ͍͍ͯΔ͔ 20 123 131 141 151 ྫʣ10ਐͷ123ʙ150ͰճจΛ୳͢߹ /39
ਓؒͲ͏ͬͯղ͍͍ͯΔ͔ 20 123 131 141 151 ྫʣ10ਐͷ123ʙ150ͰճจΛ୳͢߹ /39
ਓؒͲ͏ͬͯղ͍͍ͯΔ͔ 20 • 1ͣͭ૿͠ͳ͕Βʮ͜Εճจ͔ʁʯ ͳΜͯͬͯͳ͍ • ճจ͕ࠨӈରশͳ͜ͱΛར༻͍ͯ͠Δ • ࠨΛ1ͣͭ૿͠ͳ͕ΒڸจࣈྻΛ ࡞ͬͯΔ
123 131 141 151 ྫʣ10ਐͷ123ʙ150ͰճจΛ୳͢߹ /39
͍͔ͭ͘ύλʔϯ͕͋Δͳʁ 21 • ܻ͕ۮ͔ح͔ʢ123ͱ1234ʣ • ࠨΛͦͷ··స͢Δ͔ɺ1૿͔ͯ͠Β స͢Δ͔ʢ120→121ͱ123→131ʣ • ࠨΛ1૿ͨ͠ͱ͖ʹܻ͕૿͑Δ͔૿͑ ͳ͍͔ʢ99→101ͱ88→99ʣ
/39
/39 ͍͔ͭ͘ύλʔϯ͕͋Δͳʁ 22 • ܻ͕ۮ͔ح͔ʢ123ͱ1234ʣ • ࠨΛͦͷ··స͢Δ͔ɺ1૿͔ͯ͠Β స͢Δ͔ʢ120→121ͱ123→131ʣ • ࠨΛ1૿ͨ͠ͱ͖ʹܻ͕૿͑Δ͔૿͑
ͳ͍͔ʢ99→101ͱ88→99ʣ
1. ܻ͕ۮ͔ح͔ 23 ࠨ ӈ ճจͷܻ 12 23 3
12 34 4 123 345 5 123 456 6 حܻͷ߹ɺਅΜதͷܻΛࠨӈ྆ํʹؚΊΔ /39
/39 ͍͔ͭ͘ύλʔϯ͕͋Δͳʁ 24 • ܻ͕ۮ͔ح͔ʢ123ͱ1234ʣ • ࠨΛͦͷ··స͢Δ͔ɺ1૿͔ͯ͠Β స͢Δ͔ʢ120→121ͱ123→131ʣ • ࠨΛ1૿ͨ͠ͱ͖ʹܻ͕૿͑Δ͔૿͑
ͳ͍͔ʢ99→101ͱ88→99ʣ
2. ࠨΛ1૿͔͢Ͳ͏͔ 25 ࠨ ӈ ࠨͷస ࣍ͷճจ 10 00
01 101 12 20 21 121 12 21 21 131 12 23 21 131 ӈ >= ࠨͷస ͷͱ͖ࠨΛ1૿͢ < < >= >= /39
͍͔ͭ͘ύλʔϯ͕͋Δͳʁ 26 • ܻ͕ۮ͔ح͔ʢ123ͱ1234ʣ • ࠨΛͦͷ··స͢Δ͔ɺ1૿͔ͯ͠Β స͢Δ͔ʢ120→121ͱ123→131ʣ • ࠨΛ1૿ͨ͠ͱ͖ʹܻ͕૿͑Δ͔૿͑ ͳ͍͔ʢ99→101ͱ88→99ʣ
/39
3. ࠨΛ1૿ܻ͕ͯ͠૿͑Δ͔ 27 1૿ͨ͠ͱ͖ʹࠨͷܻ͕૿͑Δ߹ ճจͷܻݩͷࣈΑΓ૿͑Δ ࠨ 1૿͢ͱ ࣍ͷճจ ճจͷܻ
8 9 99 2 9 10 101 3 19 20 202 3 /39
ίʔυʹͯ͠ΈΔ 28/39
$ tree src src ├── Dokaku14.php └── Palindrome ├── Finder.php
├── Generator.php └── Operator.php 29 Δ͜ͱ͕ෳࡶͳͷͰΫϥε͚ ࣍ͷճจΛݟ͚ͭΔ αʔϏε ʮࠨʯΛݩʹ ճจΛ࡞ΔαʔϏε จࣈྻʹର͢ΔܭࢉΛ αϙʔτ͢ΔαʔϏε /39
30 ݺͼग़͠ݩ͜Μͳײ͡ $count = 0; $current = base_convert(strval($min - 1),
10, $base); while (base_convert($current, $base, 10) < $max) { $current = $this->finder->findNextPalindrome($current, $base); $count++; } $count--; return $count; ࣍ͷճจ·ͰਐΊΔͷͰܭࢉྔେ෯Χοτ /39
public function findNextPalindrome(string $number, int $base): string { list($leftHalf, $rightHalf)
= $this->operator->cutIntoHalf($number); $palindromeLength = strlen($number); if ($this->operator->compare($rightHalf, strrev($leftHalf), $base) >= 0) { $halfLength = strlen($leftHalf); $leftHalf = $this->operator->increment($leftHalf, $base); if (strlen($leftHalf) > $halfLength) { $palindromeLength++; } } return $this->generator->generate($leftHalf, $palindromeLength); } 31 Finderͷ࣮͜Μͳײ͡ /39
ෳࡶʹݟ͑Δ͚Ͳ 32 ͜ΕΒͷॲཧΛ͍ͯ͠Δ͚ͩͰ͢ /39
GeneratorͱOperator 33 • ༰୯७ͳͷͰ͜͜ͰׂѪ͠·͢ ʢGitHubʹ্͕ͬͯΔͷͰݟͯΈ͍ͯͩ͘͞ʣ /39
ಈ͔ͯ͠ΈΔ 34/39
35 υϠΝʂ /39
·ͱΊ 36/39
ΊͬͪΌ಄ͬͯർΕ·ͨ͠ 37 • ͳΜ͔ͩΜͩ·Ͱ͔͔࣌ؒΓ·ͨ͠ • ࢴͷ্Ͱ࣮ݧ͠ͳ͕Βߟ͑Δͷେࣄˣ /39
ιʔεGitHubʹ্͛ͯ·͢✋ 38 https://github.com/ ttskch/nagoyaphp14 /39
39 @ttskch ʘThanks!ʗ /39