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Rubyで競技プログラミング(入門編)
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yhara
September 10, 2016
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Transcript
RubyͰڝٕϓϩάϥϛϯά(ೖฤ) RubyKaigi 2016 Kyoto LT (2016-09-10) yhara (Yutaka Hara) RubyKaigi
2016 Kyoto LT (2016-09-10) 1
NaCl দߐຊࣾ AtCoderձ • ਫ༵18:00-20:00 • 4,5ਓͰͬͯΔ • ݴޠࣗ༝ (͍·ͷͱ͜ΖΈΜͳRuby)
RubyKaigi 2016 Kyoto LT (2016-09-10) 2
ڝٕϓϩάϥϛϯάͬͯʁ RubyKaigi 2016 Kyoto LT (2016-09-10) 3
ϓϩάϥϛϯάίϯςετ RubyKaigi 2016 Kyoto LT (2016-09-10) 4
݅Λຬͨ͢ϓϩάϥϜΛɺ͘ɾ ਖ਼֬ʹهड़͢Δڝٕ RubyKaigi 2016 Kyoto LT (2016-09-10) 5
C(++, #)ͱJava͚ͩ͡Όͳ͍ͷʁ RubyKaigi 2016 Kyoto LT (2016-09-10) 6
RubyͰࢀՃͰ͖Δ RubyKaigi 2016 Kyoto LT (2016-09-10) 7
• Sphere Online Judge • Aizu Online Judge • yukicoder
• AtCoder ←ࠓ͜ΕΛհ RubyKaigi 2016 Kyoto LT (2016-09-10) 8
Ruby 2.3.0͕ೖͬͯΔ RubyKaigi 2016 Kyoto LT (2016-09-10) 9
Կ͔ΒΕ͍͍ͷʁ RubyKaigi 2016 Kyoto LT (2016-09-10) 10
• AtCoder Grand Contest • AtCoder Regular Contest • AtCoder
Beginner Contest • AtCoder Typical Contest RubyKaigi 2016 Kyoto LT (2016-09-10) 11
Βͳ͍ RubyKaigi 2016 Kyoto LT (2016-09-10) 12
աڈΛΔ RubyKaigi 2016 Kyoto LT (2016-09-10) 13
• ͖ͳͱ͖ʹͰ͖Δ • যΒͳͯ͘ࡁΉ RubyKaigi 2016 Kyoto LT (2016-09-10) 14
• AtCoder Grand Contest • AtCoder Regular Contest • AtCoder
Beginner Contest • AtCoder Typical Contest RubyKaigi 2016 Kyoto LT (2016-09-10) 15
AtCoder Beginner Contest • A: ָউ • B: ؆୯ •
C: ॳڃ • D: தڃ(Γͨ͑͋͝Δ) ※ճʹΑͬͯқʹඍົͳ͕ࠩ͋Γ·͢(͍͖ͳΓ͍͠ճҾ͍ ͯམͪࠐ·ͳ͍Α͏ʹ) RubyKaigi 2016 Kyoto LT (2016-09-10) 16
Rubyͩͱ λΠϜΞτ ͦ͠͏…ʁ RubyKaigi 2016 Kyoto LT (2016-09-10) 17
ͦΕͳΓઓ͑Δ RubyKaigi 2016 Kyoto LT (2016-09-10) 18
ΞϧΰϦζϜେࣄ RubyKaigi 2016 Kyoto LT (2016-09-10) 19
ྫɿҰྻΦηϩ (C) RubyKaigi 2016 Kyoto LT (2016-09-10) 20
ҰྻΦηϩ • NݸͷۨͱɺQݸͷϨϯδ͕༩͑ΒΕΔ • ֤ൣғΛͻͬ͘Γฦͨ͠ͱ͖ͷ࠷ऴঢ়ଶΛٻΊΑ ••••••••• 1..4 2..6 8..9 ɹɹ↓
◦•••◦◦•◦◦ RubyKaigi 2016 Kyoto LT (2016-09-10) 21
֤ൣғʹ͍ͭͯۨΛసͤ͞Ε͍͍͚ͩ͡ ΌͶʁ ranges.each do |r| r.each do |i| line[i] =
!line[i] end end RubyKaigi 2016 Kyoto LT (2016-09-10) 22
ͱ͜Ζ͕ RubyKaigi 2016 Kyoto LT (2016-09-10) 23
• Φηϩ͕(࠷େ)20ສݸ͋Δ • ൣғ(࠷େ)20ສݸ͋Δ RubyKaigi 2016 Kyoto LT (2016-09-10) 24
ेԯճɺస͠ͳ͍ͱ͍͚ͳ͍ ranges.each do |r| # <- 20ສճ r.each do |i|
# <- ͦΕͧΕສճ͘Β͍ line[i] = !line[i] end end RubyKaigi 2016 Kyoto LT (2016-09-10) 25
⏰ ੍ݶ࣌ؒ2ඵ RubyKaigi 2016 Kyoto LT (2016-09-10) 26
͏·͍Γ͔ͨ ৭͕มΘΔͱ͜Ζ͚ͩΛ͓֮͑ͯ͘ 2 10001 23005 ↓ɹɹɹɹ↓ɹɹ↓ ◦••...•◦...◦••• RubyKaigi 2016 Kyoto
LT (2016-09-10) 27
௨ͬͨʂ RubyKaigi 2016 Kyoto LT (2016-09-10) 28
RubyͰڝϓϩͰ͖Δͧ ! (গͳ͘ͱBeginner ContestͳΒ) RubyKaigi 2016 Kyoto LT (2016-09-10) 29
! ༨ஊ ! RubyKaigi 2016 Kyoto LT (2016-09-10) 30
RubyKaigi 2016 Kyoto LT (2016-09-10) 31
ABC037-D • 1000x1000ͷ໎࿏Λ୳ࡧ͢Δ • νϟϨϯδϟʔٻΉ • Ruby33ഒ͘ͳΔͱ͍͏ᷚͳͷͰ͖ͬͱ௨ΔΑ͏ʹͳΔ ͣʁ RubyKaigi 2016
Kyoto LT (2016-09-10) 32
Crystalͩͱ௨Δ(͕͢͞) ※CrystalɿRubyʹΑ͘ࣅͨ੩తܕ͚ݴޠ RubyKaigi 2016 Kyoto LT (2016-09-10) 33
pypy2௨ͬͯΔ ※pypy2ɿPythonॲཧܥͷҰͭ RubyKaigi 2016 Kyoto LT (2016-09-10) 34
Python3!? RubyKaigi 2016 Kyoto LT (2016-09-10) 35
RubyKaigi 2016 Kyoto LT (2016-09-10) 36
RubyKaigi 2016 Kyoto LT (2016-09-10) 37
RubyKaigi 2016 Kyoto LT (2016-09-10) 38
(ྑ͍ࢠਅࣅ͠ͳ͍Α͏ʹ !) RubyKaigi 2016 Kyoto LT (2016-09-10) 39