[B! string-searching-algorithm] nabinnoã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

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string-searching-algorithmã«é–¢ã™ã‚‹nabinnoã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (6)

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Aho Corasick æ³• - naoyaã®ã¯ã¦ãªãƒ€ã‚¤ã‚¢ãƒªãƒ¼
é©å½“ãªå˜èªžç¾¤ã‚’å«ã‚€è¾žæ›¸ãŒã‚ã£ãŸã¨ã—ã¾ã™ã€‚ã€Œäº¬éƒ½ã®é«˜å€‰äºŒæ¡ã«ç¾Žå‘³ã—ã„ã¤ã‘éººã®ãŠåº—ãŒã‚ã‚‹ã€*1ã¨ã„ã†æ–‡ç« ãŒå…¥åŠ›ã¨ã—ã¦ä¸Žãˆã‚‰ã‚ŒãŸã¨ãã€ã“ã®æ–‡ç« ä¸ã«å«ã¾ã‚Œã‚‹è¾žæ›¸ä¸ã®ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã‚’æŠ½å‡ºã—ãŸã„ã€ã¨ã„ã†ã“ã¨ãŒã‚ã‚Šã¾ã™ã€‚ä¾‹ãˆã°è¾žæ›¸ã«ã€Œäº¬éƒ½ã€ã€Œé«˜å€‰äºŒæ¡ã€ã€Œã¤ã‘éººã€ã€Œåº—ã€ã¨ã„ã†å˜èªžãŒå«ã¾ã‚Œã¦ã„ãŸå ´åˆã«ã¯ã€ã“ã‚Œã‚‰ã®å˜èªž(ã¨å‡ºç¾ä½ç½®)ãŒå…¥åŠ›ã«å¯¾ã—ã¦ã®å‡ºåŠ›ã«ãªã‚Šã¾ã™ã€‚ ã“ã®é¡žã®å‡¦ç†ã¯ã€ä»»æ„ã®é–‹å§‹ä½ç½®ã‹ã‚‰éƒ¨åˆ†ä¸€è‡´ã™ã‚‹è¾žæ›¸ä¸ã®ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã‚’ã™ã¹ã¦å–ã‚Šå‡ºã™å‡¦ç†ã€ã¨ã„ã†ã“ã¨ã§ã€Œå…±é€šæŽ¥é è¾žæ¤œç´¢ (Common Prefix Search)ã€ãªã©ã¨å‘¼ã°ã‚Œã‚‹ãã†ã§ã™ã€‚å½¢æ…‹ç´ è§£æžã€Wikipedia ã‚„ã¯ã¦ãªã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã®ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ãƒªãƒ³ã‚¯å‡¦ç†ãªã©ãŒä»£è¡¨çš„ãªå¿œç”¨ä¾‹ã§ã™ã€‚ Aho Corasick æ³• ä»»æ„ã®ãƒ†ã‚ã‚¹ãƒˆã‹ã‚‰è¾žæ›¸ã«å«ã¾ã‚Œã‚‹ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã‚’ã™ã¹ã¦æŠ½å‡ºã™ã‚‹ã¨ã„ã†å‡¦ç†ã®å®Ÿç¾æ–¹æ³•ã¯è‰²ã€…ã¨ã‚ã‚Šã¾ã™ã€‚Aho Corasick æ³•ã¯ãã®æ–¹æ³•ã®ã²ã¨
nabinno 2014/10/06
naoya-ito

string-searching-algorithm

search-algorithm

algorithm

trie

tree-structure

graph-theory

data-structure

computer-science

alfred-aho
ãƒªãƒ³ã‚¯
Spaghetti Source - è¤‡æ•°ãƒ‘ã‚¿ãƒ¼ãƒ³æ¤œç´¢ (Aho-Corasick)
èª¬æ˜Ž è¤‡æ•°ã®ãƒ‘ã‚¿ãƒ¼ãƒ³æ–‡å—åˆ—ã‹ã‚‰ãªã‚‹é›†åˆã¨é•·ã„æ–‡å—åˆ—ãŒä¸Žãˆã‚‰ã‚Œã‚‹ï¼Žé•·ã„æ–‡å—åˆ—ã«å¯¾ã—ã¦ãƒžãƒƒãƒã™ã‚‹ãƒ‘ã‚¿ãƒ¼ãƒ³æ–‡å—åˆ—ã‚’ã™ã¹ã¦æ±‚ã‚ã‚‹ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ãŒ Aho Corasick ã§ã‚ã‚‹ï¼Žã“ã‚Œã¯è¤‡æ•°ãƒ‘ã‚¿ãƒ¼ãƒ³æ–‡å—åˆ—ã‚’ã‚ã‚‰ã‹ã˜ã‚ trie ã«å¤‰æ›ã—ã¦ã‹ã‚‰ KMP ã‚’å®Ÿè¡Œã—ï¼Œãƒ‘ã‚¿ãƒ¼ãƒ³ãƒžãƒƒãƒãƒ³ã‚°ãƒ»ã‚ªãƒ¼ãƒˆãƒžãƒˆãƒ³ã‚’æ§‹æˆã—ã¦ã„ã‚‹ã“ã¨ã«ãªã‚‹ï¼Ž è©³ã—ãã¯é©å½“ãªæˆæ›¸ã‚„ http://www.cs.uku.fi/~kilpelai/BSA05/lectures/slides04.pdf ãªã©ã‚’å‚è€ƒã®ã“ã¨ï¼Ž è¨ˆç®—é‡ æ§‹ç¯‰ O(m)ï¼Ž æ¤œç´¢ O(n + m)ï¼Ž ãŸã ã— m ã¯ãƒ‘ã‚¿ãƒ¼ãƒ³ã®æ–‡å—åˆ—é•·ã®ç·å’Œï¼Œn ã¯æ¤œç´¢ãƒ†ã‚ã‚¹ãƒˆé•·ï¼Ž ä½¿ã„æ–¹ struct PMA; ã‚’é©å®œè¨å®šã®ã“ã¨ï¼Ž build PMA(char *p[], int m) 0 ... m-1 ã®è¤‡æ•°ã®æ¤œç´¢ãƒ‘ã‚¿ãƒ¼ãƒ³ã‹ã‚‰ï¼Œãƒ‘ã‚¿ãƒ¼ãƒ³ãƒžãƒƒãƒãƒ³ã‚°ãƒ»ã‚ªãƒ¼ãƒˆãƒžãƒˆãƒ³ã‚’æ§‹ç¯‰ã™ã‚‹ï¼Ž match(c
nabinno 2014/10/06
string-searching-algorithm

search-algorithm

algorithm

computer-science
ãƒªãƒ³ã‚¯
ã‚¢ãƒ«ãƒ•ãƒ¬ãƒƒãƒ‰ãƒ»ã‚¨ã‚¤ãƒ› - Wikipedia
ã‚¢ãƒ«ãƒ•ãƒ¬ãƒƒãƒ‰ãƒ»ãƒ´ã‚¡ã‚¤ãƒŽãƒ»ã‚¨ã‚¤ãƒ›ï¼ˆAlfred Vaino Ahoã€1941å¹´8æœˆ9æ—¥ - ï¼‰ã¯ã€ã‚«ãƒŠãƒ€å‡ºèº«ã®è¨ˆç®—æ©Ÿç§‘å¦è€…ã€‚1995å¹´ã‹ã‚‰ãƒ‹ãƒ¥ãƒ¼ãƒ¨ãƒ¼ã‚¯ã®ã‚³ãƒãƒ³ãƒ“ã‚¢å¤§å¦ã§æ•™æŽˆã‚’å‹™ã‚ã¦ãŠã‚Šã€2003å¹´ã«ã¯åŒå¤§å¦åŒçª“ä¼šã‹ã‚‰ Great Teacher Award ã‚’æŽˆä¸Žã•ã‚ŒãŸã€‚ ã‚«ãƒŠãƒ€ã®ãƒˆãƒãƒ³ãƒˆå¤§å¦ã§å¿œç”¨ç‰©ç†å¦ã‚’å¦ã³ã€ã‚¢ãƒ¡ãƒªã‚«åˆè¡†å›½ã®ãƒ—ãƒªãƒ³ã‚¹ãƒˆãƒ³å¤§å¦ã§é›»æ°—å·¥å¦ã¨è¨ˆç®—æ©Ÿç§‘å¦ã®åšå£«å·ã‚’å–å¾—ã—ãŸã€‚1967å¹´ã‹ã‚‰1991å¹´ã¾ã§ãƒ™ãƒ«ç ”ç©¶æ‰€ã§ç ”ç©¶è€…ã¨ã—ã¦åƒãã€1997å¹´ã‹ã‚‰2002å¹´ã¾ã§åŒç ”ç©¶æ‰€ã®è¨ˆç®—æ©Ÿç§‘å¦ç ”ç©¶ã‚»ãƒ³ã‚¿ãƒ¼ã®å‰¯ã‚»ãƒ³ã‚¿ãƒ¼é•·ã‚’å‹™ã‚ãŸã€‚2011å¹´ç¾åœ¨ã€ã‚³ãƒãƒ³ãƒ“ã‚¢å¤§å¦ã®è¨ˆç®—æ©Ÿç§‘å¦ã®æ•™æŽˆã€‚1995å¹´ã‹ã‚‰1997å¹´ã¾ã§ã¨ã€2003å¹´æ˜¥ã«ã¯åŒå¤§å¦è¨ˆç®—æ©Ÿç§‘å¦éƒ¨é–€ã®éƒ¨é–€é•·ã‚’å‹™ã‚ãŸã€‚ åšå£«è«–æ–‡ã§ã€æ–‡è„ˆè‡ªç”±è¨€èªžã®ãƒ‘ãƒ¯ãƒ¼ã‚’æ‹¡å¼µã—ã¤ã¤æ±ºå®šå¯èƒ½æ€§ã¨é–‰åŒ…ç‰¹æ€§ã‚’ä¿æŒã™ã‚‹ indexed grammar[1] ã¨ nested-s
nabinno 2014/10/06
alfred-aho

canada

people

string-searching-algorithm

search-algorithm

algorithm

computer-science
ãƒªãƒ³ã‚¯
æ–‡å—åˆ—æŽ¢ç´¢ - Wikipedia
ã“ã®è¨˜äº‹ã¯æ¤œè¨¼å¯èƒ½ãªå‚è€ƒæ–‡çŒ®ã‚„å‡ºå…¸ãŒå…¨ãç¤ºã•ã‚Œã¦ã„ãªã„ã‹ã€ä¸ååˆ†ã§ã™ã€‚ å‡ºå…¸ã‚’è¿½åŠ ã—ã¦è¨˜äº‹ã®ä¿¡é ¼æ€§å‘ä¸Šã«ã”å”åŠ›ãã ã•ã„ã€‚ï¼ˆã“ã®ãƒ†ãƒ³ãƒ—ãƒ¬ãƒ¼ãƒˆã®ä½¿ã„æ–¹ï¼‰ å‡ºå…¸æ¤œç´¢?:Â "æ–‡å—åˆ—æŽ¢ç´¢"Â â€“Â ãƒ‹ãƒ¥ãƒ¼ã‚¹Â Â· æ›¸ç±Â Â· ã‚¹ã‚«ãƒ©ãƒ¼Â Â· CiNiiÂ Â· J-STAGEÂ Â· NDLÂ Â· dlib.jpÂ Â· ã‚¸ãƒ£ãƒ‘ãƒ³ã‚µãƒ¼ãƒÂ Â· TWL (2023å¹´8æœˆ) æ–‡å—åˆ—æŽ¢ç´¢ (ã‚‚ã˜ã‚Œã¤ãŸã‚“ã•ã) ã¨ã¯ã€ã‚ã‚‹æ–‡å—åˆ—ã®ä¸ã‹ã‚‰ã€åˆ¥ã®æ–‡å—åˆ—ï¼ˆå˜ä¸€ã®æ–‡å—åˆ—ã§ã‚ã‚‹å ´åˆã‚‚ã‚ã‚Œã°ã€æ•°åƒèªžã‹ã‚‰æ•°ä¸‡èªžä»¥ä¸Šã®è¾žæ›¸ã®èªžå½™ã§ã‚ã‚‹å ´åˆã‚‚ã‚ã‚‹ï¼‰ã‚’æŽ¢ç´¢ã™ã‚‹ã“ã¨ã§ã‚ã‚‹ã€‚å‰è€…ã®å˜ä¸€ã®æ–‡å—åˆ—ã®æŽ¢ç´¢ã¯è‹±æ–‡ã®ãƒ†ã‚ã‚¹ãƒˆã‚¨ãƒ‡ã‚£ã‚¿ç‰ã§å¿…é ˆã®æ©Ÿèƒ½ã§ã‚ã‚Šï¼ˆã„ã‚ã‚†ã‚‹ã‚¹ãƒšãƒ«ãƒã‚§ãƒƒã‚¯ã¨é–¢é€£ã™ã‚‹ï¼‰ã€å¾Œè€…ã¯ã€Œã‹ãªæ¼¢å—å¤‰æ›ã€ç‰ã§å¿…é ˆã®æ©Ÿèƒ½ã§ã‚ã‚‹ãŸã‚ã€ã“ã‚Œã¾ã§ã•ã¾ã–ã¾ãªã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ãŒè€ƒæ¡ˆã•ã‚Œã¦ã„ã‚‹ã€‚ ã“ã“ã§ã„ã†æ–‡å—åˆ—ã¨ã¯ã€ã‚ã‚‹å®šã¾ã£ãŸæ–‡å—é›†åˆã®è¦ç´ ã‚’ä»»æ„ã«ä¸¦ã¹ãŸç³»åˆ—ã®ã“ã¨ã§ã‚ã‚‹ã€‚é€š
nabinno 2014/10/06
string-searching-algorithm

search-algorithm

algorithm
ãƒªãƒ³ã‚¯
ã‚¨ã‚¤ãƒ›â€“ã‚³ãƒ©ã‚·ãƒƒã‚¯æ³• - Wikipedia
ã‚¨ã‚¤ãƒ›â€“ã‚³ãƒ©ã‚·ãƒƒã‚¯æ³•ï¼ˆè‹±: Ahoâ€“Corasick algorithmï¼‰ã¨ã¯ã€1975å¹´ã«ã‚¢ãƒ«ãƒ•ãƒ¬ãƒƒãƒ‰ãƒ»ã‚¨ã‚¤ãƒ›ã¨ Margaret J. Corasick ãŒç™ºè¦‹ã—ãŸæ–‡å—åˆ—æŽ¢ç´¢ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã§ã‚ã‚‹[1]ã€‚ ã‚¨ã‚¤ãƒ›â€“ã‚³ãƒ©ã‚·ãƒƒã‚¯æ³•ã¯ã€å…¥åŠ›ãƒ†ã‚ã‚¹ãƒˆã«ã¤ã„ã¦æœ‰é™ã®æ–‡å—åˆ—ç¾¤ï¼ˆè¾žæ›¸ï¼‰ã®å„è¦ç´ ã‚’æŽ¢ã™è¾žæ›¸å¼ãƒžãƒƒãƒãƒ³ã‚°ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã®ä¸€ç¨®ã§ã‚ã‚‹ã€‚å…¨ãƒ‘ã‚¿ãƒ¼ãƒ³ã®ãƒžãƒƒãƒãƒ³ã‚°ã‚’ä¸€æ–‰ã«æŽ¢ç´¢ã™ã‚‹ãŸã‚ã€ãã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã®è¨ˆç®—é‡ã¯ãƒ‘ã‚¿ãƒ¼ãƒ³ç¾¤ã®é•·ã•ã«å¯¾ã—ã¦ã‚‚å¯¾è±¡ãƒ†ã‚ã‚¹ãƒˆã®é•·ã•ã«å¯¾ã—ã¦ã‚‚ç·šå½¢ã§ã‚ã‚Šã€ã•ã‚‰ã«è¦‹ã¤ã‹ã£ãŸãƒžãƒƒãƒãƒ³ã‚°ã®æ•°ã«å¯¾ã—ã¦ã‚‚ç·šå½¢ã§ã‚ã‚‹ã€‚å…¨ã¦ã®ãƒžãƒƒãƒãƒ³ã‚°ã‚’æ¤œå‡ºã™ã‚‹ãŸã‚ã€ãƒ‘ã‚¿ãƒ¼ãƒ³ç¾¤ã«ã‚µãƒ–æ–‡å—åˆ—ãŒã‚ã‚Œã°ã€é‡è¤‡ã—ã¦æ¤œå‡ºã•ã‚Œã‚‹ç‚¹ã«æ³¨æ„ã•ã‚ŒãŸã„ï¼ˆã¤ã¾ã‚Šã€è¾žæ›¸ãŒ a, aa, aaa, aaaa ã§ã€å…¥åŠ›ãƒ†ã‚ã‚¹ãƒˆãŒ aaaa ã®å ´åˆãªã©ï¼‰ã€‚ å¤§ã¾ã‹ã«è¨€ãˆã°ã€ã“ã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã¯ãƒˆãƒ©ã‚¤æœ¨ã‚’æ§‹ç¯‰ã—ã€ã‚µãƒ•ã‚£ãƒƒã‚¯ã‚¹æœ¨çš„ã«æ–‡å—åˆ—ï¼ˆä¾‹ãˆã°ab
nabinno 2014/10/06
alfred-aho

string-searching-algorithm

search-algorithm

algorithm

computer-science
ãƒªãƒ³ã‚¯
RedDotRuby 2014 - Ruby.inspect by Koichi Sasada
Help us caption & translate this video! http://amara.org/v/FGZL/
nabinno 2014/10/06
movie

koichi-sasada

ruby

string.#inspect

object.#inspect

string-searching-algorithm
ãƒªãƒ³ã‚¯
1