diffã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ - Plan9日記ãµã¨è¦‹ã¤ã‘ãŸã€Œã‚ãªãŸãŒä¸€ç•ªå¥½ããªã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã‚’æ•™ãˆã¦ãã ã•ã„。ã¾ãŸã€ãã®ç†ç”±ã‚„ã©ã‚“ãªç‚¹ãŒå¥½ããªã®ã‹ã‚‚æ•™ãˆã¦ãã ã•ã„ã€ã‚’èªã‚“ã§ã€diffã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ を調ã¹ã¦ã¿ãŸã€‚2ã¤ã®ãƒ•ã‚¡ã‚¤ãƒ«ã®é•ã„を見ã¤ã‘ã‚‹ã«ã¯ã€å…±é€šã™ã‚‹éƒ¨åˆ†ãŒæœ€é•·ã«ãªã‚‹ãƒšã‚¢ã‚’見ã¤ã‘ã‚Œã°ã‚ˆã„。ã“ã‚Œã¯LCS (Longest Common Subsequence)å•é¡Œã¨å‘¼ã°ã‚Œã‚‹ã€‚LCSå•é¡Œã®æœ€é©è§£ã¯å‹•çš„計画法を用ã„ã¦æ±‚ã‚ã‚‹ã“ã¨ãŒã§ãã‚‹ãŒã€è¨ˆç®—時間ã€ãƒ¡ãƒ¢ãƒªä½¿ç”¨é‡ã¨ã‚‚ã«O(MN)ã«ãªã‚‹*1。ã“れより早ãã€ã¾ãŸå°ãƒ¡ãƒ¢ãƒªã§å®Ÿè¡Œã§ãるよã†ã«ã„ã‚ã„ã‚ãªã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ãŒæ案ã•ã‚Œã¦ã„る。 テã‚ストを比較ã™ã‚‹diffã¨ã„ã†Unixç³»ã®ã‚³ãƒžãƒ³ãƒ‰ãŒã‚ã‚Šã¾ã™ãŒã€ã“ã‚Œã¯å®Ÿã¯é«˜åº¦ã«æ•°å¦çš„ãªã‚¨ãƒ‡ã‚£ãƒƒãƒˆã‚°ãƒ©ãƒ•ã¨ã„ã†ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ãŒä½¿ã‚ã‚Œã¦ã„ã¾ã™ã€‚ [1] E.W.Myers, "An O(ND) difference algorithm and its variations"
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