Double-Array Search
by
jojonki
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Slide 1
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc ݕࡧͯ͠ΈΑ͏ʂ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc base[1]͔Βελʔτʂ “a#”Λݕࡧʂ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 base[1]+code(a)=4 index 4ʹҠಈ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “a#”Λݕࡧʂ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 check[4] == ભҠݩindex? OK! ભҠՄೳ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “a#”Λݕࡧʂ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 base[4]+code(#)=3 index 3ʹҠಈ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “a#”Λݕࡧʂ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 check[3] == ભҠݩindex? OK! ભҠՄೳ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “a#”Λݕࡧʂ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 base͕-1ऴ Αͬͯޠኮaొ͞Ε͍ͯΔʂ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “a#”Λݕࡧʂ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “bc#”Λݕࡧʂ base[1]+code(b)=5 index 5ʹҠಈ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 check[5] == ભҠݩindex? OK! ભҠՄೳ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “bc#”Λݕࡧʂ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “bc#”Λݕࡧʂ base[5]+code(c)=6 index 6ʹҠಈ 6 -1 7 7 5
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7 5 3 3 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 check[6] == ભҠݩindex? OK! ભҠՄೳ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “bc#”Λݕࡧʂ 6 -1 7
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 base[6]+code(#)=7 index 7ʹҠಈ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “bc#”Λݕࡧʂ 6 -1 7 7 5
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7 5 3 3 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 check[7] == ભҠݩindex? OK! ભҠՄೳ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “bc#”Λݕࡧʂ 6 -1 7
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7 5 3 3 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “bc#”Λݕࡧʂ 6 -1 7 base͕-1ऴ Αͬͯޠኮbcొ͞Ε͍ͯΔʂ
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “c”Λݕࡧʂ base[1]+code(c)=6 index 6ʹҠಈ 6 -1 7 7 5
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3 3 -1 3 -1 0 0 1 5 1 4 0 base check index 1 2 5 4 6 3 check[6] == ભҠݩindex? NO! “c”ભҠෆՄ จࣈίʔυ #: 0 a: 1 b: 2 c: 3 ޠኮࣙॻ a bc “c”Λݕࡧʂ 6 -1 7 7 5