\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1 - \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\/26904\/\" \/>\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, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"\uc774 \uae00\uc5d0\uc11c\ub294 \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1(LCA: Lowest Common Ancestor) \ubb38\uc81c\uc758 \uc815\uc758\uc640 \ud574\uacb0 \ubc29\ubc95\uc744 \uc790\uc138\ud788 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ubb38\uc81c \uc815\uc758 \ubb38\uc81c: \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1(Lowest Common Ancestor – LCA) \uc774\uc9c4 \ud2b8\ub9ac\uc5d0\uc11c \ub450 \ub178\ub4dc\uc758 \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \uad6c\ud558\uc2dc\uc624. \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc740 \ub450 \ub178\ub4dc\uc758 \uc870\uc0c1\uc774\uba74\uc11c \ub450 \ub178\ub4dc\uc758 \uac70\ub9ac\uc5d0\uc11c \uac00\uc7a5 \uac00\uae4c\uc6b4 \ub178\ub4dc\uc785\ub2c8\ub2e4. \uc608\uc2dc\ub85c, \uc544\ub798\uc640 \uac19\uc740 \uc774\uc9c4 \ud2b8\ub9ac\uac00 \uc8fc\uc5b4\uc84c\uc744 \ub54c: 3 \/ 5 … \ub354 \ubcf4\uae30 "\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1"\" \/>\n<meta property=\"og:url\" content=\"https:\/\/atmokpo.com\/w\/26904\/\" \/>\n<meta property=\"og:site_name\" content=\"\ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"article:published_time\" content=\"2024-10-27T11:53:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-26T07:26:42+00:00\" \/>\n<meta name=\"author\" content=\"root\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@bebubo4\" \/>\n<meta name=\"twitter:site\" content=\"@bebubo4\" \/>\n<meta name=\"twitter:label1\" content=\"\uae00\uc4f4\uc774\" \/>\n\t<meta name=\"twitter:data1\" content=\"root\" \/>\n\t<meta name=\"twitter:label2\" content=\"\uc608\uc0c1 \ub418\ub294 \ud310\ub3c5 \uc2dc\uac04\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\ubd84\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/atmokpo.com\/w\/26904\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/atmokpo.com\/w\/26904\/\"},\"author\":{\"name\":\"root\",\"@id\":\"https:\/\/atmokpo.com\/w\/#\/schema\/person\/91b6b3b138fbba0efb4ae64b1abd81d7\"},\"headline\":\"\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\",\"datePublished\":\"2024-10-27T11:53:32+00:00\",\"dateModified\":\"2024-11-26T07:26:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/atmokpo.com\/w\/26904\/\"},\"wordCount\":33,\"publisher\":{\"@id\":\"https:\/\/atmokpo.com\/w\/#organization\"},\"articleSection\":[\"\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c\"],\"inLanguage\":\"ko-KR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/atmokpo.com\/w\/26904\/\",\"url\":\"https:\/\/atmokpo.com\/w\/26904\/\",\"name\":\"\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1 - 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\ubb38\uc81c \ud480\uc774<\/h2>\n

1. \ubb38\uc81c \ubd84\uc11d<\/h3>\n

\uc8fc\uc5b4\uc9c4 \uc774\uc9c4 \ud2b8\ub9ac\uc5d0\uc11c \ub450 \ub178\ub4dc\uc758 \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \ucc3e\uae30 \uc704\ud574\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ub450 \uac00\uc9c0 \uc870\uac74\uc744 \ucda9\uc871\ud574\uc57c \ud569\ub2c8\ub2e4:<\/p>\n

\ub178\ub4dc A\uc758 \uc870\uc0c1\uc778 \ub178\ub4dc B\uac00 \uc874\uc7ac\ud574\uc57c \ud569\ub2c8\ub2e4.<\/li>\n

\ub178\ub4dc C\uc758 \uc870\uc0c1\uc778 \ub178\ub4dc B\ub3c4 \uc874\uc7ac\ud574\uc57c \ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n

\uc774\ub7ec\ud55c \uad00\uacc4\ub97c \uc131\ub9bd\uc2dc\ud0a4\uae30 \uc704\ud574 \uc774\uc9c4 \ud2b8\ub9ac\ub97c \uc21c\ud68c\ud558\uba70 \uac01 \ub178\ub4dc\uc5d0 \ub300\ud574 \ubd80\ubaa8 \ub178\ub4dc\ub97c \ucd94\uc801\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

2. \uc54c\uace0\ub9ac\uc998 \uc124\uacc4<\/h3>\n

\uc6b0\uc120, \uc774\uc9c4 \ud2b8\ub9ac\uc5d0\uc11c \ud2b9\uc815 \ub178\ub4dc\ub97c \ucc3e\uae30 \uc704\ud574 DFS(Depth First Search) \ub610\ub294 BFS(Breadth First Search)\uc640 \uac19\uc740 \ud0d0\uc0c9 \uae30\ubc95\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

\ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \ucc3e\uae30 \uc704\ud55c \uad6c\uccb4\uc801\uc778 \uc54c\uace0\ub9ac\uc998\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n

\ub8e8\ud2b8 \ub178\ub4dc\ubd80\ud130 \uc2dc\uc791\ud558\uc5ec \ud2b8\ub9ac\ub97c \ud0d0\uc0c9\ud569\ub2c8\ub2e4.<\/li>\n
\uc591\ucabd \uc11c\ube0c\ud2b8\ub9ac\uc5d0\uc11c \uc8fc\uc5b4\uc9c4 \ub450 \ub178\ub4dc\ub97c \ucc3e\uc2b5\ub2c8\ub2e4.<\/li>\n
\ub9cc\uc57d \uac01\uac01\uc758 \uc11c\ube0c\ud2b8\ub9ac\uc5d0\uc11c \ud55c \uac1c\uc758 \ub178\ub4dc\ub97c \ucc3e\uc73c\uba74 \ud604\uc7ac \ub178\ub4dc\uac00 \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc785\ub2c8\ub2e4.<\/li>\n

\ubaa8\ub450 \ucc3e\uc9c0 \ubabb\ud55c \uacbd\uc6b0, null\uc744 \ubc18\ud658\ud569\ub2c8\ub2e4.<\/li>\n<\/ol>\n

3. \uc790\ubc14 \ucf54\ub4dc \uad6c\ud604<\/h3>\n

\npublic class TreeNode {\n    int val;\n    TreeNode left;\n    TreeNode right;\n\n    TreeNode(int x) {\n        val = x;\n    }\n}\n\npublic class LCA {\n    public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {\n        \/\/ \ubca0\uc774\uc2a4 \ucf00\uc774\uc2a4\n        if (root == null || root == p || root == q) {\n            return root;\n        }\n\n        \/\/ \uc67c\ucabd\uacfc \uc624\ub978\ucabd \uc11c\ube0c\ud2b8\ub9ac\uc5d0\uc11c LCA\ub97c \ucc3e\uc2b5\ub2c8\ub2e4.\n        TreeNode left = lowestCommonAncestor(root.left, p, q);\n        TreeNode right = lowestCommonAncestor(root.right, p, q);\n\n        \/\/ \ub458 \ub2e4 \ucc3e\uc740 \uacbd\uc6b0, \ud604\uc7ac \ub178\ub4dc\uac00 LCA\uc785\ub2c8\ub2e4.\n        if (left != null && right != null) {\n            return root;\n        }\n\n        \/\/ \ud55c\ucabd \uc11c\ube0c\ud2b8\ub9ac\uc5d0\uc11c \ucc3e\uc740 \uacbd\uc6b0 \uadf8 \uacb0\uacfc\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4.\n        return left != null ? left : right;\n    }\n}\n    <\/pre>\n4. \ucf54\ub4dc \uc124\uba85<\/h3>\n\uc704\uc758 \ucf54\ub4dc\uc5d0\uc11c \ud575\uc2ec \ud3ec\uc778\ud2b8\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n
\n\uc7ac\uadc0\uc801\uc73c\ub85c \ud638\ucd9c\ud558\uc5ec \ud604\uc7ac \ub178\ub4dc\uac00 null\uc778\uc9c0 \ub610\ub294 \ucc3e\uace0\uc790 \ud558\ub294 \ub178\ub4dc\uc778\uc9c0 \ud655\uc778\ud569\ub2c8\ub2e4.<\/li>\n
\uc67c\ucabd \ubc0f \uc624\ub978\ucabd \uc11c\ube0c\ud2b8\ub9ac\uc5d0\uc11c \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \ucc3e\uace0, \ub458 \ub2e4 \ucc3e\uc558\ub2e4\uba74 \ud604\uc7ac \ub178\ub4dc\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4.<\/li>\n
\ub05d\uc73c\ub85c \ud55c\ucabd \uc11c\ube0c\ud2b8\ub9ac\uc5d0\uc11c\ub9cc \ubc1c\uacac\ud55c \uacbd\uc6b0 \ud574\ub2f9 \ub178\ub4dc\ub97c \ubc18\ud658\ud558\uba70, \uadf8 \uc678\uc5d0\ub294 null\uc744 \ubc18\ud658\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n5. \uc2dc\uac04 \ubcf5\uc7a1\ub3c4<\/h3>\n\uc774 \uc54c\uace0\ub9ac\uc998\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(N)\uc73c\ub85c, \uceec\ub809\uc158\uc758 \uac01 \ub178\ub4dc\ub97c \ud55c \ubc88\uc529 \ubc29\ubb38\ud558\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. N\uc740 \ud2b8\ub9ac\uc758 \ub178\ub4dc \uc218\uc785\ub2c8\ub2e4.<\/p>\n
6. \uacf5\uac04 \ubcf5\uc7a1\ub3c4<\/h3>\n\uacf5\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(H)\ub85c, H\ub294 \ud2b8\ub9ac\uc758 \ub192\uc774\uc785\ub2c8\ub2e4. \ucd5c\uc545\uc758 \uacbd\uc6b0, \uc774\uc9c4 \ud2b8\ub9ac\uac00 \ud55c\ucabd\uc73c\ub85c \uce58\uc6b0\uccd0 \uc788\uc744 \uacbd\uc6b0 \ucd5c\ub300 \ub192\uc774\ub294 N\uc774 \ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<\/section>\n
\n\uc2e4\uc804 \ucf54\ub4dc \ud14c\uc2a4\ud2b8<\/h2>\n\ubb38\uc81c\ub97c \uc2e4\uc81c\ub85c \ud14c\uc2a4\ud2b8\ud558\uae30 \uc704\ud574 \uc608\uc81c \ud2b8\ub9ac\ub97c \uc0dd\uc131\ud558\uace0 LCA\ub97c \uad6c\ud558\ub294 \ucf54\ub4dc\ub97c \uc791\uc131\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
\npublic class Main {\n    public static void main(String[] args) {\n        \/\/ \uc774\uc9c4 \ud2b8\ub9ac \uc0dd\uc131\n        TreeNode root = new TreeNode(3);\n        TreeNode node5 = new TreeNode(5);\n        TreeNode node1 = new TreeNode(1);\n        TreeNode node6 = new TreeNode(6);\n        TreeNode node2 = new TreeNode(2);\n        TreeNode node0 = new TreeNode(0);\n        TreeNode node8 = new TreeNode(8);\n        TreeNode node7 = new TreeNode(7);\n        TreeNode node4 = new TreeNode(4);\n\n        root.left = node5;\n        root.right = node1;\n        node5.left = node6;\n        node5.right = node2;\n        node1.left = node0;\n        node1.right = node8;\n        node2.left = node7;\n        node2.right = node4;\n\n        \/\/ LCA\ub97c \ucc3e\uae30 \uc704\ud55c \uac1d\uccb4 \uc0dd\uc131\n        LCA lcaFinder = new LCA();\n        TreeNode lca = lcaFinder.lowestCommonAncestor(root, node5, node1);\n        System.out.println(\"LCA of 5 and 1: \" + lca.val); \/\/ \ucd9c\ub825: 3\n\n        lca = lcaFinder.lowestCommonAncestor(root, node5, node4);\n        System.out.println(\"LCA of 5 and 4: \" + lca.val); \/\/ \ucd9c\ub825: 5\n    }\n}\n    <\/pre>\n<\/section>\n\n\uacb0\ub860<\/h2>\n\uc774\ubc88 \uae00\uc5d0\uc11c\ub294 \uc774\uc9c4 \ud2b8\ub9ac\uc5d0\uc11c \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \ucc3e\ub294 \ubb38\uc81c\ub97c \ub2e4\ub8e8\uba70, \ubb38\uc81c \uc815\uc758, \uc54c\uace0\ub9ac\uc998 \uc124\uacc4, Java \ucf54\ub4dc \uad6c\ud604, \ucf54\ub4dc \ud14c\uc2a4\ud2b8\uae4c\uc9c0\uc758 \uc804 \uacfc\uc815\uc5d0 \ub300\ud574 \uc124\uba85\ud558\uc600\uc2b5\ub2c8\ub2e4. \uc774 \ubb38\uc81c\ub294 \ub2e4\uc591\ud55c \uc0c1\ud669\uc5d0\uc11c \uc751\uc6a9\ub420 \uc218 \uc788\uc73c\uba70, \uc54c\uace0\ub9ac\uc998 \ubc0f \ub370\uc774\ud130 \uad6c\uc870\uc758 \uae30\ucd08\uc801\uc778 \uac1c\ub150\uc744 \uc774\ud574\ud558\ub294 \ub370 \ud070 \ub3c4\uc6c0\uc774 \ub429\ub2c8\ub2e4.<\/p>\n
\uc774\ub97c \ud1b5\ud574 \uc790\ubc14\ub85c \ucf54\ub529\ud14c\uc2a4\ud2b8\ub97c \uc900\ube44\ud558\ub294 \ub370 \uc720\uc6a9\ud55c \uc54c\uace0\ub9ac\uc998 \ud328\ud134\uc744 \uc775\ud790 \uc218 \uc788\uc73c\uba70, \ubb38\uc81c \ud574\uacb0 \ub2a5\ub825\uc744 \ud0a4\uc6b0\ub294 \ub370 \uae30\uc5ec\ud560 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<\/section>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
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\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\/26904\/\" \/>\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, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"\uc774 \uae00\uc5d0\uc11c\ub294 \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1(LCA: Lowest Common Ancestor) \ubb38\uc81c\uc758 \uc815\uc758\uc640 \ud574\uacb0 \ubc29\ubc95\uc744 \uc790\uc138\ud788 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ubb38\uc81c \uc815\uc758 \ubb38\uc81c: \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1(Lowest Common Ancestor – LCA) \uc774\uc9c4 \ud2b8\ub9ac\uc5d0\uc11c \ub450 \ub178\ub4dc\uc758 \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \uad6c\ud558\uc2dc\uc624. \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc740 \ub450 \ub178\ub4dc\uc758 \uc870\uc0c1\uc774\uba74\uc11c \ub450 \ub178\ub4dc\uc758 \uac70\ub9ac\uc5d0\uc11c \uac00\uc7a5 \uac00\uae4c\uc6b4 \ub178\ub4dc\uc785\ub2c8\ub2e4. \uc608\uc2dc\ub85c, \uc544\ub798\uc640 \uac19\uc740 \uc774\uc9c4 \ud2b8\ub9ac\uac00 \uc8fc\uc5b4\uc84c\uc744 \ub54c: 3 \/  5 … \ub354 \ubcf4\uae30 "\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1"\" \/>\n<meta property=\"og:url\" content=\"https:\/\/atmokpo.com\/w\/26904\/\" \/>\n<meta property=\"og:site_name\" content=\"\ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"article:published_time\" content=\"2024-10-27T11:53:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-26T07:26:42+00:00\" \/>\n<meta name=\"author\" content=\"root\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@bebubo4\" \/>\n<meta name=\"twitter:site\" content=\"@bebubo4\" \/>\n<meta name=\"twitter:label1\" content=\"\uae00\uc4f4\uc774\" \/>\n\t<meta name=\"twitter:data1\" content=\"root\" \/>\n\t<meta name=\"twitter:label2\" content=\"\uc608\uc0c1 \ub418\ub294 \ud310\ub3c5 \uc2dc\uac04\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\ubd84\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/atmokpo.com\/w\/26904\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/atmokpo.com\/w\/26904\/\"},\"author\":{\"name\":\"root\",\"@id\":\"https:\/\/atmokpo.com\/w\/#\/schema\/person\/91b6b3b138fbba0efb4ae64b1abd81d7\"},\"headline\":\"\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\",\"datePublished\":\"2024-10-27T11:53:32+00:00\",\"dateModified\":\"2024-11-26T07:26:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/atmokpo.com\/w\/26904\/\"},\"wordCount\":33,\"publisher\":{\"@id\":\"https:\/\/atmokpo.com\/w\/#organization\"},\"articleSection\":[\"\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c\"],\"inLanguage\":\"ko-KR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/atmokpo.com\/w\/26904\/\",\"url\":\"https:\/\/atmokpo.com\/w\/26904\/\",\"name\":\"\uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1 - 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