{"id":26942,"date":"2024-10-27T11:53:49","date_gmt":"2024-10-27T11:53:49","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=26942"},"modified":"2024-11-26T07:25:37","modified_gmt":"2024-11-26T07:25:37","slug":"%ec%9e%90%eb%b0%94-%ec%bd%94%eb%94%a9%ed%85%8c%ec%8a%a4%ed%8a%b8-%ea%b0%95%ec%a2%8c-%ed%8a%b8%eb%9d%bc%ec%9d%b4","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/26942\/","title":{"rendered":"\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ud2b8\ub77c\uc774"},"content":{"rendered":"<div class=\"post-content\">\n<p>\ucf54\ub529 \ud14c\uc2a4\ud2b8\uc640 \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c \ud574\uacb0\uc5d0\uc11c \ud6a8\uc728\uc801\uc778 \ubb38\uc790\uc5f4 \ucc98\ub9ac\ub294 \ub9e4\uc6b0 \uc911\uc694\ud569\ub2c8\ub2e4. \ubb38\uc790\uc5f4 \uad00\ub828 \ubb38\uc81c\ub294 \ub9ce\uc740 \uae30\uc5c5\uc5d0\uc11c \uc790\uc8fc \ucd9c\uc81c\ub418\uae30 \ub54c\ubb38\uc5d0 \uc774\uc5d0 \ub300\ud55c \uc774\ud574\ub294 \ud544\uc218\uc801\uc785\ub2c8\ub2e4. \uc624\ub298\uc740 &#8216;\ud2b8\ub77c\uc774(Trie)&#8217;\ub77c\ub294 \uc790\ub8cc\uad6c\uc870\ub97c \ud65c\uc6a9\ud558\uc5ec \ubb38\uc790\uc5f4\uc744 \ud6a8\uc728\uc801\uc73c\ub85c \uc800\uc7a5\ud558\uace0 \uac80\uc0c9\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \ud559\uc2b5\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>\ud2b8\ub77c\uc774(Trie)\ub780?<\/h2>\n<p>\ud2b8\ub77c\uc774\ub294 &#8216;\ud504\ub9ac\ud53d\uc2a4 \ud2b8\ub9ac(Prefix Tree)&#8217; \ub610\ub294 &#8216;\ub514\uc9c0\ud138 \ud2b8\ub9ac(Digital Tree)&#8217;\ub77c\uace0\ub3c4 \ubd88\ub9ac\uba70, \ubb38\uc790\uc5f4\uc758 \uc9d1\ud569\uc744 \uc800\uc7a5\ud558\uae30 \uc704\ud55c \ud2b8\ub9ac \uae30\ubc18 \uc790\ub8cc\uad6c\uc870\uc785\ub2c8\ub2e4. \uc8fc\ub85c \ubb38\uc790\uc5f4 \uac80\uc0c9 \ub610\ub294 \uc790\ub3d9 \uc644\uc131 \uae30\ub2a5 \uad6c\ud604\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4. \ud2b8\ub77c\uc774\uc758 \uc8fc\uc694 \ud2b9\uc9d5\uc740 \uac01 \ub178\ub4dc\uac00 \ubb38\uc790\uc5f4\uc758 \uac01 \ubb38\uc790\uc5d0 \ub300\ud55c \uc815\ubcf4\ub97c \ub2f4\uace0 \uc788\uc73c\ubbc0\ub85c, \uacf5\ud1b5 \uc811\ub450\uc0ac\ub97c \uacf5\uc720\ud558\ub294 \ubb38\uc790\uc5f4\uc5d0 \ub300\ud574 \ub9e4\uc6b0 \ud6a8\uc728\uc801\uc778 \uc800\uc7a5 \ubc0f \uac80\uc0c9\uc774 \uac00\ub2a5\ud558\ub2e4\ub294 \uc810\uc785\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \ubb38\uc790\uc5f4 &#8220;hello&#8221;, &#8220;helicopter&#8221;, &#8220;helic&#8221;\uc774 \uc788\uc744 \uacbd\uc6b0, \uccab \ub450 \uae00\uc790\uc778 &#8220;he&#8221;\ub97c \uacf5\uc720\ud558\ubbc0\ub85c \uc774\ub97c \ud55c \uac1c\uc758 \ub178\ub4dc\ub85c \ud45c\ud604\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>\ubb38\uc81c \uc124\uba85<\/h2>\n<p>\ub2e4\uc74c\uc740 \ud2b8\ub77c\uc774 \uc790\ub8cc\uad6c\uc870\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \ubb38\uc81c\uc785\ub2c8\ub2e4:<\/p>\n<blockquote>\n<p><strong>\ubb38\uc81c:<\/strong> \uc8fc\uc5b4\uc9c4 \ub2e8\uc5b4 \ubaa9\ub85d\uc5d0\uc11c \ud2b9\uc815 \uc811\ub450\uc0ac\ub97c \uac00\uc9c4 \ub2e8\uc5b4\uac00 \uba87 \uac1c\uc778\uc9c0 \uad6c\ud558\ub294 \ud568\uc218\ub97c \uad6c\ud604\ud558\uc138\uc694.<\/p>\n<p><strong>\uc785\ub825:<\/strong> \ubb38\uc790\uc5f4 \ubc30\uc5f4 words (ex: [&#8220;apple&#8221;, &#8220;app&#8221;, &#8220;apricot&#8221;, &#8220;banana&#8221;, &#8220;band&#8221;, &#8220;bandana&#8221;]) \ubc0f \ubb38\uc790\uc5f4 prefix (\uc608: &#8220;ap&#8221;)<\/p>\n<p><strong>\ucd9c\ub825:<\/strong> \uc8fc\uc5b4\uc9c4 prefix\ub85c \uc2dc\uc791\ud558\ub294 \ub2e8\uc5b4\uc758 \uac1c\uc218<\/p>\n<\/blockquote>\n<h2>\ubb38\uc81c \ud574\uacb0 \uacfc\uc815<\/h2>\n<h3>1. \ud2b8\ub77c\uc774 \uad6c\ud604<\/h3>\n<p>\uba3c\uc800, \ud2b8\ub77c\uc774 \uc790\ub8cc\uad6c\uc870\ub97c \uad6c\ud604\ud558\uae30 \uc704\ud574 \ub178\ub4dc \ud074\ub798\uc2a4\ub97c \uc815\uc758\ud569\ub2c8\ub2e4. \uac01 \ub178\ub4dc\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uc18d\uc131\uc744 \uac00\uc9d1\ub2c8\ub2e4:<\/p>\n<ul>\n<li><strong>children:<\/strong> \ub2e4\uc74c \ubb38\uc790\ub85c \uc774\ub3d9\ud558\uae30 \uc704\ud55c \uc790\uc2dd \ub178\ub4dc\ub4e4<\/li>\n<li><strong>isEndOfWord:<\/strong> \ud574\ub2f9 \ub178\ub4dc\uac00 \ub2e8\uc5b4\uc758 \ub05d\uc778\uc9c0 \uc5ec\ubd80\ub97c \ub098\ud0c0\ub0b4\ub294 \ubd88\ub9ac\uc5b8 \ubcc0\uc218<\/li>\n<\/ul>\n<pre><code>class TrieNode {\n        Map<character, trienode=\"\"> children;\n        boolean isEndOfWord;\n\n        public TrieNode() {\n            children = new HashMap&lt;&gt;();\n            isEndOfWord = false;\n        }\n    }<\/character,><\/code><\/pre>\n<h3>2. \ud2b8\ub77c\uc774 \uc0bd\uc785 \uba54\uc11c\ub4dc<\/h3>\n<p>\ub2e8\uc5b4\ub97c \ud2b8\ub9ac\uc5d0 \uc0bd\uc785\ud558\ub294 \uba54\uc11c\ub4dc\ub97c \uad6c\ud604\ud569\ub2c8\ub2e4. \ubb38\uc790\uc5f4\uc758 \uac01 \ubb38\uc790\ub97c \uc21c\ud68c\ud558\uba70 \ud574\ub2f9 \ubb38\uc790\uc758 \uc790\uc2dd \ub178\ub4dc\uac00 \uc5c6\ub2e4\uba74 \uc0c8\ub85c \uc0dd\uc131\ud558\uace0, \ub9c8\uc9c0\ub9c9 \ubb38\uc790\uc5d0 \ub3c4\ub2ec\ud588\uc744 \ub54c\ub294 <code>isEndOfWord<\/code>\ub97c <code>true<\/code>\ub85c \uc124\uc815\ud569\ub2c8\ub2e4.<\/p>\n<pre><code>class Trie {\n        private final TrieNode root;\n\n        public Trie() {\n            root = new TrieNode();\n        }\n\n        public void insert(String word) {\n            TrieNode node = root;\n            for (char ch : word.toCharArray()) {\n                node = node.children.computeIfAbsent(ch, c -&gt; new TrieNode());\n            }\n            node.isEndOfWord = true;\n        }\n    }<\/code><\/pre>\n<h3>3. \uc811\ub450\uc0ac \uac80\uc0c9 \uba54\uc11c\ub4dc<\/h3>\n<p>\uc8fc\uc5b4\uc9c4 \uc811\ub450\uc0ac\ub85c \uc2dc\uc791\ud558\ub294 \ub2e8\uc5b4\uc758 \uac1c\uc218\ub97c \uc138\uae30 \uc704\ud574, \uba3c\uc800 \uc811\ub450\uc0ac \ub178\ub4dc\ub97c \ucc3e\uc544\uc57c \ud569\ub2c8\ub2e4. \uc811\ub450\uc0ac \ub178\ub4dc\ub97c \ucc3e\uc740 \ud6c4, \ud574\ub2f9 \ub178\ub4dc\uc5d0\uc11c DFS\ub97c \ud1b5\ud574 \ud558\uc704 \ud2b8\ub9ac\uc758 \ub2e8\uc5b4 \uac1c\uc218\ub97c \uc218\uc149\ub2c8\ub2e4.<\/p>\n<pre><code>public int countWordsWithPrefix(String prefix) {\n        TrieNode node = root;\n        for (char ch : prefix.toCharArray()) {\n            if (!node.children.containsKey(ch)) {\n                return 0; \/\/ \uc811\ub450\uc0ac\uac00 \uc874\uc7ac\ud558\uc9c0 \uc54a\uc73c\uba74 0 \ubc18\ud658\n            }\n            node = node.children.get(ch);\n        }\n        return countWords(node);\n    }\n\n    private int countWords(TrieNode node) {\n        int count = node.isEndOfWord ? 1 : 0; \/\/ \ud604\uc7ac \ub178\ub4dc\uac00 \ub2e8\uc5b4\uc758 \ub05d\uc774\ub77c\uba74 1 \ucd94\uac00\n        for (TrieNode child : node.children.values()) {\n            count += countWords(child); \/\/ \ud558\uc704 \ub178\ub4dc\uc5d0 \ub300\ud574 \uc7ac\uadc0 \ud638\ucd9c\n        }\n        return count;\n    }<\/code><\/pre>\n<h2>\uc804\uccb4 \ucf54\ub4dc<\/h2>\n<p>\uc774\uc81c \uc704\uc758 \ubaa8\ub4e0 \uba54\uc11c\ub4dc\ub97c \ud1b5\ud569\ud558\uc5ec \uc644\uc131\ub41c \ucf54\ub4dc \uc804\uccb4\ub97c \ubcf4\uc5ec\ub4dc\ub9ac\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>import java.util.HashMap;\n    import java.util.Map;\n\n    class TrieNode {\n        Map<character, trienode=\"\"> children;\n        boolean isEndOfWord;\n\n        public TrieNode() {\n            children = new HashMap&lt;&gt;();\n            isEndOfWord = false;\n        }\n    }\n\n    class Trie {\n        private final TrieNode root;\n\n        public Trie() {\n            root = new TrieNode();\n        }\n\n        public void insert(String word) {\n            TrieNode node = root;\n            for (char ch : word.toCharArray()) {\n                node = node.children.computeIfAbsent(ch, c -&gt; new TrieNode());\n            }\n            node.isEndOfWord = true;\n        }\n\n        public int countWordsWithPrefix(String prefix) {\n            TrieNode node = root;\n            for (char ch : prefix.toCharArray()) {\n                if (!node.children.containsKey(ch)) {\n                    return 0;\n                }\n                node = node.children.get(ch);\n            }\n            return countWords(node);\n        }\n\n        private int countWords(TrieNode node) {\n            int count = node.isEndOfWord ? 1 : 0;\n            for (TrieNode child : node.children.values()) {\n                count += countWords(child);\n            }\n            return count;\n        }\n    }\n\n    public class Main {\n        public static void main(String[] args) {\n            Trie trie = new Trie();\n            trie.insert(\"apple\");\n            trie.insert(\"app\");\n            trie.insert(\"apricot\");\n            trie.insert(\"banana\");\n            trie.insert(\"band\");\n            trie.insert(\"bandana\");\n            \n            System.out.println(trie.countWordsWithPrefix(\"ap\")); \/\/ \ucd9c\ub825: 3\n        }\n    }<\/character,><\/code><\/pre>\n<h2>\uacb0\ub860<\/h2>\n<p>\uc624\ub298\uc740 \ud2b8\ub77c\uc774(Trie) \uc790\ub8cc\uad6c\uc870\uc5d0 \ub300\ud574 \uc0b4\ud3b4\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \ud2b8\ub77c\uc774\ub294 \ubb38\uc790\uc5f4 \uac80\uc0c9\uacfc \uc790\ub3d9 \uc644\uc131 \uae30\ub2a5 \uad6c\ud604\uc5d0 \ub9e4\uc6b0 \uc720\uc6a9\ud55c \uc790\ub8cc\uad6c\uc870\ub85c, \ud6a8\uc728\uc801\uc778 \uc800\uc7a5 \ubc0f \uac80\uc0c9\uc774 \uac00\ub2a5\ud569\ub2c8\ub2e4. \ub2e4\uc591\ud55c \ubb38\uc790\uc5f4 \uad00\ub828 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \ud2b8\ub77c\uc774\ub97c \uc801\uadf9\uc801\uc73c\ub85c \ud65c\uc6a9\ud558\uba74 \uc88b\uaca0\uc2b5\ub2c8\ub2e4. \ud2b9\ud788, \ucf54\ub529 \ud14c\uc2a4\ud2b8\ub97c \uc900\ube44\ud558\ub294 \ubd84\ub4e4\uc5d0\uac8c \ud2b8\ub77c\uc774\ub294 \uaf2d \uc54c\uc544\ub450\uc5b4\uc57c \ud560 \ud544\uc218 \uc790\ub8cc\uad6c\uc870\uc785\ub2c8\ub2e4.<\/p>\n<p>\uc9c1\uc811\uc801\uc778 \ubb38\uc81c \ud574\uacb0 \ubfd0\ub9cc \uc544\ub2c8\ub77c, \ud2b8\ub77c\uc774\uc758 \uad6c\uc870\uc640 \uadf8 \ud65c\uc6a9\uc740 \uc2e4\ubb34\uc5d0\uc11c\ub3c4 \ub9ce\uc774 \uc0ac\uc6a9\ub418\ub294 \uae30\ubc95\uc785\ub2c8\ub2e4. \ud2b8\ub77c\uc774\ub97c \ud1b5\ud574 \uc2dc\uc791\ud558\ub294 \ub2e4\uc591\ud55c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c \ud480\uc774\uc5d0 \ub3c4\uc804\ud574 \ubcf4\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4!<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ucf54\ub529 \ud14c\uc2a4\ud2b8\uc640 \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c \ud574\uacb0\uc5d0\uc11c \ud6a8\uc728\uc801\uc778 \ubb38\uc790\uc5f4 \ucc98\ub9ac\ub294 \ub9e4\uc6b0 \uc911\uc694\ud569\ub2c8\ub2e4. \ubb38\uc790\uc5f4 \uad00\ub828 \ubb38\uc81c\ub294 \ub9ce\uc740 \uae30\uc5c5\uc5d0\uc11c \uc790\uc8fc \ucd9c\uc81c\ub418\uae30 \ub54c\ubb38\uc5d0 \uc774\uc5d0 \ub300\ud55c \uc774\ud574\ub294 \ud544\uc218\uc801\uc785\ub2c8\ub2e4. \uc624\ub298\uc740 &#8216;\ud2b8\ub77c\uc774(Trie)&#8217;\ub77c\ub294 \uc790\ub8cc\uad6c\uc870\ub97c \ud65c\uc6a9\ud558\uc5ec \ubb38\uc790\uc5f4\uc744 \ud6a8\uc728\uc801\uc73c\ub85c \uc800\uc7a5\ud558\uace0 \uac80\uc0c9\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \ud559\uc2b5\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ud2b8\ub77c\uc774(Trie)\ub780? \ud2b8\ub77c\uc774\ub294 &#8216;\ud504\ub9ac\ud53d\uc2a4 \ud2b8\ub9ac(Prefix Tree)&#8217; \ub610\ub294 &#8216;\ub514\uc9c0\ud138 \ud2b8\ub9ac(Digital Tree)&#8217;\ub77c\uace0\ub3c4 \ubd88\ub9ac\uba70, \ubb38\uc790\uc5f4\uc758 \uc9d1\ud569\uc744 \uc800\uc7a5\ud558\uae30 \uc704\ud55c \ud2b8\ub9ac \uae30\ubc18 \uc790\ub8cc\uad6c\uc870\uc785\ub2c8\ub2e4. \uc8fc\ub85c \ubb38\uc790\uc5f4 \uac80\uc0c9 \ub610\ub294 &hellip; <a href=\"https:\/\/atmokpo.com\/w\/26942\/\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ud2b8\ub77c\uc774&#8221;<\/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":[22],"tags":[],"class_list":["post-26942","post","type-post","status-publish","format-standard","hentry","category-22"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ud2b8\ub77c\uc774 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atmokpo.com\/w\/26942\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ud2b8\ub77c\uc774 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"\ucf54\ub529 \ud14c\uc2a4\ud2b8\uc640 \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c \ud574\uacb0\uc5d0\uc11c \ud6a8\uc728\uc801\uc778 \ubb38\uc790\uc5f4 \ucc98\ub9ac\ub294 \ub9e4\uc6b0 \uc911\uc694\ud569\ub2c8\ub2e4. \ubb38\uc790\uc5f4 \uad00\ub828 \ubb38\uc81c\ub294 \ub9ce\uc740 \uae30\uc5c5\uc5d0\uc11c \uc790\uc8fc \ucd9c\uc81c\ub418\uae30 \ub54c\ubb38\uc5d0 \uc774\uc5d0 \ub300\ud55c \uc774\ud574\ub294 \ud544\uc218\uc801\uc785\ub2c8\ub2e4. \uc624\ub298\uc740 &#8216;\ud2b8\ub77c\uc774(Trie)&#8217;\ub77c\ub294 \uc790\ub8cc\uad6c\uc870\ub97c \ud65c\uc6a9\ud558\uc5ec \ubb38\uc790\uc5f4\uc744 \ud6a8\uc728\uc801\uc73c\ub85c \uc800\uc7a5\ud558\uace0 \uac80\uc0c9\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \ud559\uc2b5\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ud2b8\ub77c\uc774(Trie)\ub780? \ud2b8\ub77c\uc774\ub294 &#8216;\ud504\ub9ac\ud53d\uc2a4 \ud2b8\ub9ac(Prefix Tree)&#8217; \ub610\ub294 &#8216;\ub514\uc9c0\ud138 \ud2b8\ub9ac(Digital Tree)&#8217;\ub77c\uace0\ub3c4 \ubd88\ub9ac\uba70, \ubb38\uc790\uc5f4\uc758 \uc9d1\ud569\uc744 \uc800\uc7a5\ud558\uae30 \uc704\ud55c \ud2b8\ub9ac \uae30\ubc18 \uc790\ub8cc\uad6c\uc870\uc785\ub2c8\ub2e4. \uc8fc\ub85c \ubb38\uc790\uc5f4 \uac80\uc0c9 \ub610\ub294 &hellip; \ub354 \ubcf4\uae30 &quot;\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ud2b8\ub77c\uc774&quot;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/atmokpo.com\/w\/26942\/\" \/>\n<meta property=\"og:site_name\" content=\"\ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"article:published_time\" content=\"2024-10-27T11:53:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-26T07:25:37+00:00\" \/>\n<meta name=\"author\" content=\"root\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" 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