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What are AtCoder and competitive programming
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きりみん
August 16, 2019
Programming
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What are AtCoder and competitive programming
きりみん
August 16, 2019
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Transcript
͔̌Β̑ͰΘ͔Δ AtCoderͱ ڝٕϓϩάϥϛϯά @kirimin_chan
ࣗݾհ • όʔνϟϧ༮ঁϓϩάϥϚͷ͖ΓΈΜͪΌΜͰ ͢ʂ • ڝٕϓϩάϥϛϯάॳ৺ऀͰ͢ • ߴϨʔτίʔμʔΛࢦͯ͠मߦதʂ • ຖिAtCoderͷաڈΛղ͘৴ΛͬͯΔΑʂ
AtCoderͬͯͳʹʁ • AtCoderΦϯϥΠϯͰࢀՃͰ͖Δڝٕϓϩ άϥϛϯάͷαΠτͷ໊લͩΑ • ΄΅ຖिίϯςετ͕։࠵͞Ε͍ͯͯɺ୭Ͱ ແྉͰ؆୯ʹࢀՃͰ͖ΔΑ • աڈʹ͍ͭͰઓͰ͖ΔΑ
ڝٕϓϩάϥϛϯάͬͯͳʹʁ • ڝٕϓϩάϥϛϯάɺग़͞Εͨ݅Λຬͨ͢ ϓϩάϥϜΛղ͘εϐʔυਖ਼֬͞Λڝ͏ϓϩά ϥϛϯάΛ͏ڝٕͩΑ • ڝϓϩͱ͔ϓϩάϥϛϯάίϯςετͱ͔ݴͬͨ Γ͢ΔΑ • Web্Ͱ୭Ͱ؆୯ʹࢀՃͰ͖Δෑډͷ͍ڝٕ
ͩΑ
ϓϩάϥϛϯάͬͯͳʹʁ • ΞϓϦίϯϐϡʔλʔΛಈ͔ͨ͢Ίͷ໋ྩ จͷ͜ͱͩΑ • WebαΠτεϚϗΞϓϦςϨϏήʔϜ ϓϩάϥϛϯάΛͬͯ࡞ΒΕ͍ͯΔΑ • Ή͔ͣͦ͠͏ʹݟ͑Δ͚Ͳɺ࢝ΊΔͷʹඞཁ ͳࣝগͳ͘୭Ͱ͙͢ʹ࢝ΊΒΕΔΑʂ
val time = getTime() ←ίϯϐϡʔλʔ͔Β࣌ؒΛऔಘ͢Δ if (time >= 12) {ɹˡ͠12ͱಉ͔ͦ͡ΕΑΓେ͖͔ͬͨΒ
show("ޕޙͩΑ")ɹˡʮޕޙͩΑʯͱը໘ʹදࣔ͢Δ } else {ɹˡ͕ͪͬͨΒ show("ޕલͩΑ")ɹˡʮޕલͩΑʯͱը໘ʹදࣔ͢Δ } ϓϩάϥϛϯάͷΠϝʔδ • ϓϩάϥϛϯάͬͯ͜Μͳײ͡ͷͷͩΑ (͘͢͝؆ུԽͨ͠ϓϩάϥϜͷίʔυ)
࣮ࡍʹڝٕϓϩάϥϛϯάͰॻ ͘ϓϩάϥϜ
ڝٕϓϩάϥϛϯάͷԿָ͕͠ ͍ͷʁ • ύζϧͷΑ͏ʹΉ͔͍ͣ͠Λ͔Μ͕͑ͯ ղ͘ͷ͕ͨͷ͍͠ • ରઓήʔϜͷΑ͏ʹϓϩάϥϛϯάͷ݁Ռʹ είΞ(ϨʔτॱҐ)͕ग़Δͷ͕ͨͷ͍͠ • ͍Ζ͍ΖͳϓϩάϥϛϯάͷςΫχοΫΛֶ
Ϳ͜ͱ͕Ͱ͖Δ
ڝٕϓϩάϥϛϯά≠ιϑτ ΣΞ։ൃ • ڝٕϓϩάϥϛϯά͕ग़དྷͯΞϓϦήʔ ϜͳͲͷιϑτΣΞ͕࡞ΕΔΘ͚Ͱͳ͍ • ٯʹΞϓϦήʔϜ͕࡞Εͯڝٕϓϩάϥ ϛϯά͕ڧ͍ͱݶΒͳ͍ • Ͱڝٕϓϩάϥϛϯάϓϩάϥϛϯάͷ
ษڧʹͳΔ͠ɺιϑτΣΞ։ൃʹཱͭ
۩ମతʹͲΜͳΛղ͘ͷʁ • ϓϩάϥϛϯάͷجૅ͕͔Ε͙͢ʹղ͚ Δ͔ΒɺߴͳϓϩάϥϛϯάςΫχο Ϋֶͷ͕ࣝඞཁͳϨϕϧͷ·Ͱ ৭ʑ͋ΔΑ • ϓϩάϥϛϯάॳ৺ऀֶͷ͕ࣝͳͯ͘ ղ͚ΔϨϕϧͷͨ͘͞Μ͋ΔΑ
۩ମతʹͲΜͳΛղ͘ͷʁ Ҿ༻ݩɿAtCoder Beginner Contest A - Addition and Subtraction Easy
ͭ·ΓͲ͏͍͏͜ͱʁ • 2ͭͷࣈͱʮ+ʯ͔ʮ-ʯͷه߸͕͞ΕΔͷ Ͱɺ͠ࢉ͔Ҿ͖ࢉΛͯ݁͠ՌΛฦ͠ͳ͍͞ ͱ͍͏
ճྫ
͔ΜͨΜ☺
AtCoderͷಛ • ຊͷαΠτ͔ͩΒղઆຊޠʂ • ؆୯ͳ͔Β͍͠·Ͱͨ͘͞Μ͋Δ • աڈ͍ͭͰઓ͢Δ͜ͱ͕Ͱ͖Δ • ڝٕϓϩάϥϛϯάC++PythonͳͲͷݴޠͰ ղ͘ਓ͕ଟ͍͕ɺAtCoderJavaRubyͳͲॳ৺
ऀʹਓؾͷ͍Ζ͍ΖͳݴޠʹରԠ͍ͯ͠Δʂ
AtCoderͷಛ • Beginner Contest(ABC)Regular Contest(ARC) ͳͲ͍͔ͭ͘ͷϨϕϧͷίϯςετ͕͋Δ • ABCͰͯ͢ͷ͕ղ͚ͨΒWebϓϩάϥ Ϛʔͱͯ͠ΦʔόʔεϖοΫͳ͘Β͍ͷϨϕϧ ײ
• ͖ΓΈΜͪΌΜ͕ීஈઓͯ͠ΔͷABC
AtCoderͷಛ • ίϯςετຊ൪ͷʹΑͬͯϨʔτ͕͘ • ϨʔτʹΑͬͯ৭͚͞Ε͍ͯͯɺAtCoderຽ৭Ͱࣗͷڧ͞Λදݱ͢Δ • փɿॳظ৭ • ɿී௨ʹϓϩάϥϛϯά͕ಘҙ •
ɿϓϩάϥϚʔͱͯ͠όϦόϦࣄ͕Ͱ͖Δ • ਫɿී௨ͷϓϩάϥϚʔͱͯ͠จ۟ͳ͠ͷ࣮ྗ • ੨ɿߴͳϓϩάϥϛϯά͕ඞཁͳͷ։ൃͰ׆༂Ͱ͖Δ
Ͳ͏ͬͯ͡ΊΔͷʁ • ϓϩάϥϛϯά͕Ͱ͖ΔͳΒAtCoderͷαΠτͰ ొ͢Δ͚ͩʂ • ίϯςετ͍͍ͩͨຖिʹ։࠵͞Ε͍ͯΔ ͷͰɺࢀՃొͯͦ͠ͷ࣌ؒʹαΠτʹΞΫηε ͢Δ͚ͩʂ • ϓϩάϥϛϯά͕͔Βͳ͚Εϓϩάϥϛϯά
ͷೖॻΛങͬͯΈΑ͏ʂ
ҰॹʹڝٕϓϩάϥϛϯάΛ ͨͷ͠͏ʂ
ڵຯ͕ग़ͨΒ ʮ͖ΓΈΜͪΌΜͶΔʯ ͷಈը৴ΛݟͯΈͯͶʂ YouTubeͰʮ͖ΓΈΜͪΌΜ ͶΔʯͰݕࡧ✨✨✨