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【Go言語】map
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Tomoki Ota
August 16, 2024
Programming
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【Go言語】map
mapについて解説しています
Tomoki Ota
August 16, 2024
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Transcript
Tomoki Ota ʲGoݴޠʳmap
mapͱ? 2
mapͱʁ 3
mapͱʁ 4
mapͱʁ GoͰɺmapϋογϡςʔϒϧͷσʔλߏʹجͮ͘ 5
mapͱʁ ෦తʹϋογϡςʔϒϧɺόέοτͷϙΠϯλͷྻ ֤όέοτΩʔͱͷϖΞΛ8ͭ࣋ͭ 6
mapͷϋογϡςʔϒϧ map[string]intͷόέοτ0ʹͨ͠ϋογϡςʔϒϧදݱͷྫ 7 hash(“two") = 0
ཁૉͷૠೖ 8 ผͷཁૉͷ map[string]intͷόέοτ0ʹͨ͠ϋογϡςʔϒϧදݱͷྫ
ཁૉͷૠೖ(όέοτ͕͍ͬͺ͍ͷͱ͖) 9
ಡΈग़͠ɺߋ৽ɺআͷܭࢉྔ 10 Λόέοτͷ૯ͱ͢Δͱɺ (σϑΥϧτ1ɺΦʔόϑϩʔ࣌ෳͷόέοτ) p ࠷ѱ࣌ؒܭࢉྔ ͱͳΔ O(p)
ॳظԽ
ॳظԽ
100ສݸͷཁૉͷՃ Ϛοϓ͕ࣗಈͰ֦େͯ͠ɺόέοτΛอ࣋͢Δྻ͕2ഒͱͳΔ
Ϛοϓ͕֦େ͢Δ݅ ྻͷཁૉ͝ͱʹόέοτ͕อ࣋͢Δཁૉͷฏۉ(Load Factor)͕ ͋Δఆ(ݱঢ়6.5ɻ80%)ΑΓେ͖͍ͱ͖ Φʔόʔϑϩʔ͍ͯ͠Δྻͷཁૉ͕ͱͯେ͖͍ͱ͖
Ωʔͷૠೖͷܭࢉྔ 15 Ϛοϓ͕֦େ͢Δͱ͖ɺશͯͷΩʔ͕શͯͷόέοτ࠶ஔ͢Δɻ ΛϚοϓͷཁૉͷ૯ͱ͢Δͱ n ࠷ѱ࣌ؒܭࢉྔ ͱͳΔ O(n)
ॳظԽ 16 makeͰॳظԽ͢Δ
ॳظԽ 17
ॳظԽ 18 αΠζnΛࢦఆ͢ΔͱɺGoϥϯλΠϜʹগͳ͘ͱnݸͷཁૉΛ อ࣋Ͱ͖ΔϚοϓΛׂΓͯΔΑ͏ʹཁٻ͢Δɻ ❌ ࠷େnݸͷཁૉΛ࣋ͭϚοϓΛ࡞Δ
mapͱϝϞϦʔϦʔΫ
mapͱϝϞϦʔϦʔΫ
mapͱϝϞϦʔϦʔΫ 1. ۭϚοϓΛׂΓͯΔ 2. 100ສݸͷཁૉΛՃ͢Δ 3. શͯͷཁૉΛऔΓআ͍ͯɺGCΛ࣮ߦͤ͞Δ 4. ֤εςοϓͷޙɺώʔϓͷେ͖͞(Mb)Λදࣔ
mapͱϝϞϦʔϦʔΫ 1. ۭϚοϓΛׂΓͯΔ 2. 100ສݸͷཁૉΛՃ͢Δ 3. શͯͷཁૉΛऔΓআ͍ͯɺGCΛ࣮ߦͤ͞Δ 4. ֤εςοϓͷޙɺώʔϓͷେ͖͞(Mb)Λදࣔ
mapͱϝϞϦʔϦʔΫ 1. ۭϚοϓΛׂΓͯΔ 2. 100ສݸͷཁૉΛՃ͢Δ 3. શͯͷཁૉΛऔΓআ͍ͯɺGCΛ࣮ߦͤ͞Δ 4. ֤εςοϓͷޙɺώʔϓͷେ͖͞(Mb)Λදࣔ
GoͷϚοϓruntime.hmapߏମͷϙΠϯλɻ ͜ͷߏମʹɺϚοϓͷόέοτΛࣔ͢BϑΟʔϧυͳͲෳͷϑΟʔϧυ͕͋Δɻ mapͱϝϞϦʔϦʔΫ
mapͱϝϞϦʔϦʔΫ
100ສݸͷཁૉΛՃ͢Δ → Bͷ18ɺ όέοτͱͳΔ 100ສݸͷཁૉΛऔΓআ͘ → B18ͷ··ɻΏ͑ʹɺϚοϓ·ͩಉ͡ͷόέοτΛอ࣋͢Δ 218 = 262144
mapͱϝϞϦʔϦʔΫ
mapͱϝϞϦʔϦʔΫ 1࣌ؒͷσʔλΛอଘ͢Δͱ͢ΔɻେنͳϓϩϞʔγϣϯΛߦ ͏߹ɺ1࣌ؒޙʹɺඦສਓͷ͓٬༷͕γεςϜʹଓ͢Δ͔ ͠Εͳ͍ɻ͔͠͠ɺϓϩϞʔγϣϯͷޙɺϐʔΫ࣌ͱಉ ͡ͷόέοτ͕Ϛοϓʹอ࣋͞Εͨ··ʹͳΔɻ͜ͷΑ͏ͳγ φϦΦͷ߹ɺϝϞϦͷফඅྔ͕େ෯ʹݮগͤͣɺϝϞϦͷফඅ͕ ଟ͘ͳΔɻ
ݱࡏͷϚοϓͷίϐʔΛఆظతʹ࠶࡞͢Δ mapܕ͕ྻͷϙΠϯλΛอ࣋͢ΔΑ͏ʹมߋ͢Δ ख࡞ۀͰ࠶ىಈͨ͘͠ͳ͍߹
͓·͚
͓·͚ όέοτʹ8ݸ·Ͱ֦େ͞Ε͍ͯΔͱ͜Ζʹɺ্ͷΑ͏ʹΞαΠϯ͢Δ߹Λߟ͑Δ
͓·͚
͓·͚
͓·͚ 1. ϋογϡͷੜ 2. ֨ೲ͢Δόέοτͷબ 3. tophashͷੜ 4. tophashΛར༻ͯ͠ॻ͖ࠐΉ͖ϝϞϦҐஔΛಛఆ 5.
৽͍͠όέοτͷՃͱνΣʔϯ
ϋογϡͷੜ
֨ೲ͢Δόέοτͷબ
tophashͷੜ
tophashͷੜ
tophashΛར༻ͯ͠ॻ͖ࠐΉ͖ϝϞϦҐஔΛಛఆ
৽͍͠όέοτͷՃͱνΣʔϯ