\uc811\ub450\uc5b4\uac00 \uac19\uc740 \ub2e8\uc5b4\ub97c \uadf8\ub8f9\ud654\ud560 \uc218 \uc788\ub294 \uad6c\uc870.<\/li>\n<\/ul>\n\n \ud2b8\ub77c\uc774\ub294 \uc77c\ubc18\uc801\uc73c\ub85c \ub2e4\uc74c\uacfc \uac19\uc740 \ubc29\uc2dd\uc73c\ub85c \uad6c\uc131\ub429\ub2c8\ub2e4:\n <\/p>\n
\nclass TrieNode {\n Dictionary Children;\n bool IsEndOfWord;\n\n public TrieNode() {\n Children = new Dictionary();\n IsEndOfWord = false;\n }\n}\n \nclass Trie {\n private TrieNode root;\n\n public Trie() {\n root = new TrieNode();\n }\n\n public void Insert(string word) {\n TrieNode current = root;\n foreach (char c in word) {\n if (!current.Children.ContainsKey(c)) {\n current.Children[c] = new TrieNode();\n }\n current = current.Children[c];\n }\n current.IsEndOfWord = true;\n }\n\n public bool Search(string word) {\n TrieNode current = root;\n foreach (char c in word) {\n if (!current.Children.ContainsKey(c)) {\n return false;\n }\n current = current.Children[c];\n }\n return current.IsEndOfWord;\n }\n\n public bool StartsWith(string prefix) {\n TrieNode current = root;\n foreach (char c in prefix) {\n if (!current.Children.ContainsKey(c)) {\n return false;\n }\n current = current.Children[c];\n }\n return true;\n }\n}\n <\/char,><\/char,><\/code><\/pre>\n3. \ubb38\uc81c \uc18c\uac1c<\/h2>\n
\uc774\ubc88 \uac15\uc88c\uc5d0\uc11c \ub2e4\ub8f0 \ubb38\uc81c\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n
\ubb38\uc81c: \ud2b9\uc815 \uc811\ub450\uc0ac\ub97c \uac00\uc9c4 \ub2e8\uc5b4\uc758 \uac1c\uc218 \uad6c\ud558\uae30<\/h3>\n
\n \uc8fc\uc5b4\uc9c4 \ub2e8\uc5b4 \ubaa9\ub85d\uacfc \ud2b9\uc815 \uc811\ub450\uc0ac prefix\uac00 \uc788\uc744 \ub54c, \uc774 \uc811\ub450\uc0ac\ub85c \uc2dc\uc791\ud558\ub294 \ub2e8\uc5b4\uc758 \uac1c\uc218\ub97c \ubc18\ud658\ud558\ub294 \ud568\uc218\ub97c \uc791\uc131\ud558\uc138\uc694.
\n
\n\uc785\ub825:<\/strong><\/p>\n\n- \ub2e8\uc5b4 \ubaa9\ub85d: [“apple”, “app”, “application”, “apricot”]<\/li>\n
- \uc811\ub450\uc0ac: “app”<\/li>\n<\/ul>\n
\ucd9c\ub825:<\/strong> 3 (\ub2e8\uc5b4 \ubaa9\ub85d\uc5d0\uc11c “app”, “apple”, “application”\uc774 \uc788\ub2e4.)\n <\/p>\n4. \ubb38\uc81c \ud574\uacb0 \uacfc\uc815<\/h2>\n
\n \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \ud2b8\ub77c\uc774 \uc790\ub8cc\uad6c\uc870\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub2e8\uc5b4\ub97c \uc0bd\uc785\ud558\uace0, \ud2b9\uc815 \uc811\ub450\uc0ac\ub85c \uc2dc\uc791\ud558\ub294 \ub2e8\uc5b4\uc758 \uac1c\uc218\ub97c \uc138\ub294 \ud568\uc218\ub97c \uad6c\ud604\ud560 \uac83\uc785\ub2c8\ub2e4. <\/p>\n
1. **\ub2e8\uc5b4 \uc0bd\uc785**: \uba3c\uc800 \ubaa8\ub4e0 \ub2e8\uc5b4\ub97c \ud2b8\ub77c\uc774\uc5d0 \uc0bd\uc785\ud574\uc57c \ud569\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \uac01 \ub2e8\uc5b4\uc758 \ubb38\uc790\ubcc4\ub85c \uc790\uc2dd \ub178\ub4dc\uac00 \uc0dd\uc131\ub429\ub2c8\ub2e4.
\n
\n 2. **\uc811\ub450\uc0ac \uac80\uc0c9**: \ud2b9\uc815 \uc811\ub450\uc0ac\ub85c \uae4a\uc774 \ud0d0\uc0c9\ud558\uba74\uc11c, \ud574\ub2f9 \uc811\ub450\uc0ac\ub85c \uc2dc\uc791\ud558\ub294 \ubaa8\ub4e0 \ub2e8\uc5b4\uc758 \uac1c\uc218\ub97c \uc138\ub294 \ub85c\uc9c1\uc744 \uad6c\ud604\ud569\ub2c8\ub2e4.
\n
\n 3. **\uacb0\uacfc \ubc18\ud658**: \uc811\ub450\uc0ac\ub85c \uc2dc\uc791\ud558\ub294 \ub2e8\uc5b4\uc758 \uac1c\uc218\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4.\n <\/p>\n
4.1 \ucf54\ub4dc \uad6c\ud604<\/h3>\n
\uc544\ub798\ub294 C#\uc73c\ub85c \uad6c\ud604\ud55c \uc804\uccb4 \ucf54\ub4dc\uc785\ub2c8\ub2e4:<\/p>\n
\nclass Solution {\n public int CountWordsWithPrefix(string[] words, string prefix) {\n Trie trie = new Trie();\n \n \/\/ \ubaa8\ub4e0 \ub2e8\uc5b4\ub97c \ud2b8\ub77c\uc774\uc5d0 \uc0bd\uc785\n foreach (string word in words) {\n trie.Insert(word);\n }\n \n \/\/ \uc811\ub450\uc0ac\ub85c \uc2dc\uc791\ud558\ub294 \ub2e8\uc5b4\uc758 \uac1c\uc218\ub97c \uc138\uae30\n return CountWordsStartingWithPrefix(trie, prefix);\n }\n\n private int CountWordsStartingWithPrefix(Trie trie, string prefix) {\n TrieNode current = trie.Root;\n foreach (char c in prefix) {\n if (!current.Children.ContainsKey(c)) {\n return 0; \/\/ \uc811\ub450\uc0ac\uc5d0 \ud574\ub2f9\ud558\ub294 \ub2e8\uc5b4\uac00 \uc5c6\uc73c\uba74 0 \ubc18\ud658\n }\n current = current.Children[c];\n }\n return CountAllWords(current); \/\/ \uc811\ub450\uc0ac \uc544\ub798\uc758 \ubaa8\ub4e0 \ub2e8\uc5b4 \uc138\uae30\n }\n\n private int CountAllWords(TrieNode node) {\n int count = 0;\n \n if (node.IsEndOfWord) {\n count++; \/\/ \ud604\uc7ac \ub178\ub4dc\uac00 \ub2e8\uc5b4\uc758 \ub05d\uc774\ub77c\uba74 \ub2e8\uc5b4 \uce74\uc6b4\ud2b8\n }\n \n foreach (var child in node.Children) {\n count += CountAllWords(child.Value); \/\/ \ubaa8\ub4e0 \uc790\uc2dd \ub178\ub4dc\uc5d0 \ub300\ud574 \uc7ac\uadc0 \ud0d0\uc0c9\n }\n \n return count;\n }\n}\n <\/code><\/pre>\n5. \uc2dc\uac04 \ubcf5\uc7a1\ub3c4 \ubd84\uc11d<\/h3>\n
\n \ud2b8\ub77c\uc774\uc5d0 \ub2e8\uc5b4\ub97c \uc0bd\uc785\ud558\ub294 \ub370 \uac78\ub9ac\ub294 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(m)\uc785\ub2c8\ub2e4. \uc5ec\uae30\uc11c m\uc740 \ub2e8\uc5b4\uc758 \uae38\uc774\uc785\ub2c8\ub2e4.
\n \uc811\ub450\uc0ac\ub97c \uac80\uc0c9\ud558\ub294 \ub370\uc5d0\ub294 O(k) (k\ub294 \uc811\ub450\uc0ac\uc758 \uae38\uc774) \uc2dc\uac04\uc774 \uc18c\uc694\ub429\ub2c8\ub2e4.
\n \ub530\ub77c\uc11c \uc804\uccb4 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(n * m + k), \uc5ec\uae30\uc11c n\uc740 \ub2e8\uc5b4\uc758 \uac1c\uc218\uc785\ub2c8\ub2e4.\n <\/p>\n
6. \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4<\/h2>\n
\ub2e4\uc74c\uc740 \uba87 \uac00\uc9c0 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\uc785\ub2c8\ub2e4:<\/p>\n
\nstring[] words = {\"apple\", \"app\", \"application\", \"apricot\"};\nstring prefix = \"app\";\nSolution solution = new Solution();\nConsole.WriteLine(solution.CountWordsWithPrefix(words, prefix)); \/\/ \ucd9c\ub825: 3\n\nwords = new string[] {\"banana\", \"bandana\", \"band\"};\nprefix = \"ban\";\nConsole.WriteLine(solution.CountWordsWithPrefix(words, prefix)); \/\/ \ucd9c\ub825: 3\n\nwords = new string[] {\"car\", \"cart\", \"cat\"};\nprefix = \"ca\";\nConsole.WriteLine(solution.CountWordsWithPrefix(words, prefix)); \/\/ \ucd9c\ub825: 3\n\nwords = new string[] {\"dog\", \"deer\", \"dough\"};\nprefix = \"do\";\nConsole.WriteLine(solution.CountWordsWithPrefix(words, prefix)); \/\/ \ucd9c\ub825: 3\n <\/code><\/pre>\n7. \uacb0\ub860<\/h2>\n
\n \uc774\ubc88 \uae00\uc5d0\uc11c\ub294 \ud2b8\ub77c\uc774 \uc790\ub8cc\uad6c\uc870\ub97c \uc774\uc6a9\ud574 \ubb38\uc790\uc5f4 \ucc98\ub9ac \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \ud2b8\ub77c\uc774\ub294 \ub9ce\uc740 \ubd84\uc57c\uc5d0\uc11c \ub2e4\uc591\ud55c \uc6a9\ub3c4\ub85c \uc0ac\uc6a9\ub418\uba70, \ubb38\uc790\uc5f4 \uac80\uc0c9\uacfc \uac19\uc740 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30\uc5d0 \uc544\uc8fc \uc720\uc6a9\ud55c \ub370\uc774\ud130 \uad6c\uc870\uc785\ub2c8\ub2e4. \ud2b8\ub77c\uc774\uc758 \ud575\uc2ec \uc544\uc774\ub514\uc5b4\uc640 \ud568\uaed8 C#\uc744 \ud1b5\ud55c \uad6c\ud604\uc744 \uc0b4\ud3b4\ubcf4\uc558\uc73c\uba70, \ub2e4\uc591\ud55c \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\ub97c \ud1b5\ud558\uc5ec \ubb38\uc81c \ud574\uacb0 \ub2a5\ub825\uc744 \ud5a5\uc0c1\uc2dc\ud0ac \uc218 \uc788\uae30\ub97c \ubc14\ub78d\ub2c8\ub2e4.\n <\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
1. \uc11c\ub860 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc758 \uc131\uc7a5\uc774 \ud568\uaed8\ud558\uba74\uc11c, \ub2e4\uc591\ud55c \uc790\ub8cc\uad6c\uc870\uc640 \uc54c\uace0\ub9ac\uc998\uc774 \ud544\uc694\ud558\uac8c \ub418\uc5c8\uc2b5\ub2c8\ub2e4. \uadf8 \uc911\uc5d0\uc11c \ud2b8\ub77c\uc774\ub294 \ubb38\uc790\uc5f4\uc744 \ud6a8\uc728\uc801\uc73c\ub85c \ucc98\ub9ac\ud558\ub294\ub370 \ud2b9\ud654\ub41c \uc790\ub8cc\uad6c\uc870\ub85c, \uc8fc\ub85c \ubb38\uc790\uc5f4 \uac80\uc0c9, \uc790\ub3d9\uc644\uc131 \uae30\ub2a5, \uc811\ub450\uc5b4 \uc9d1\ud569 \uc800\uc7a5 \ub4f1\uc5d0 \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \uc774 \uae00\uc5d0\uc11c\ub294 \ud2b8\ub77c\uc774 \uc790\ub8cc\uad6c\uc870\ub97c \ud65c\uc6a9\ud55c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \uc18c\uac1c\ud558\uace0, C#\uc73c\ub85c \ubb38\uc81c\ub97c \ud480\uc5b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. 2. \ud2b8\ub77c\uc774(Trie) \uc790\ub8cc\uad6c\uc870\uc758 \uc774\ud574 \ud2b8\ub77c\uc774\ub294 \ub2e4\ud615\uc801\uc778 \uc18d\uc131\uc744 \uac00\uc9c0\uba70, \ub178\ub4dc\ub4e4\uc740 \uac01 \ubb38\uc790\ub97c \ub098\ud0c0\ub0c5\ub2c8\ub2e4. \ud2b8\ub77c\uc774\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 … \ub354 \ubcf4\uae30 “C# \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ud2b8\ub77c\uc774”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[24],"tags":[],"class_list":["post-27376","post","type-post","status-publish","format-standard","hentry","category-c--"],"yoast_head":"\nC# \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ud2b8\ub77c\uc774 - 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