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<\/p>\n

\ubb38\uc81c \uc124\uba85<\/h2>\n
\n \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1(LCA, Lowest Common Ancestor)\uc740 \ub450 \ub178\ub4dc\uc758 \uac00\uc7a5 \ucd5c\uadfc \uc870\uc0c1 \ub178\ub4dc\ub97c \ucc3e\ub294 \ubb38\uc81c\uc785\ub2c8\ub2e4. \uc774 \ubb38\uc81c\ub294 \ud2b8\ub9ac \uc790\ub8cc\uad6c\uc870\uc5d0\uc11c \ub9e4\uc6b0 \uc911\uc694\ud558\uba70, \ucf54\ub529 \ud14c\uc2a4\ud2b8 \ubc0f \uba74\uc811\uc5d0\uc11c\ub3c4 \uc790\uc8fc \ucd9c\uc81c\ub418\ub294 \uc8fc\uc81c\uc785\ub2c8\ub2e4. \uc774 \uac15\uc88c\uc5d0\uc11c\ub294 \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub97c \uc774\uc6a9\ud574 LCA\ub97c \ucc3e\ub294 \ubc29\ubc95\uc744 \ub2e4\ub8e8\uace0, \uc2e4\uc81c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \uacfc\uc815\uc744 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.\n <\/p>\n

\ubb38\uc81c \uc815\uc758<\/h2>\n
\n \uc8fc\uc5b4\uc9c4 \uc774\uc9c4 \ud2b8\ub9ac\uc640 \ub450 \ub178\ub4dc A\uc640 B\uac00 \uc788\uc744 \ub54c, \ub450 \ub178\ub4dc\uc758 \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \ucc3e\uc544 \ubc18\ud658\ud558\ub294 \ud568\uc218\ub97c \uc791\uc131\ud558\uc138\uc694.\n <\/p>\n

\uc785\ub825 \ud615\uc2dd<\/h3>\n

\ub178\ub4dc\uc758 \uc218\ub294 N<\/code>\uc774\uba70, 1 \u2264 N \u2264 10^4<\/code>\uc785\ub2c8\ub2e4.<\/li>\n
\uac01 \ub178\ub4dc\ub294 \uc720\uc77c\ud55c \uc815\uc218 ID\ub97c \uac00\uc9d1\ub2c8\ub2e4.<\/li>\n

\ub450 \ub178\ub4dc\uc758 ID A<\/code>, B<\/code>\uac00 \uc8fc\uc5b4\uc9d1\ub2c8\ub2e4.<\/li>\n<\/ul>\n\ucd9c\ub825 \ud615\uc2dd<\/h3>\n\n\ub450 \ub178\ub4dc\uc758 \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \ub098\ud0c0\ub0b4\ub294 \ub178\ub4dc\uc758 ID\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n\uc608\uc81c<\/h2>\n
\uc608\uc81c 1<\/h3>\n\n        \uc785\ub825: \n        \ud2b8\ub9ac \uad6c\uc870:\n              1\n            \/   \\\n          2      3\n         \/ \\    \/ \\\n        4   5  6   7\n\n        A = 4, B = 5\n        \ucd9c\ub825: 2  \/\/ \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1: 2\n    <\/pre>\n\uc608\uc81c 2<\/h3>\n\n        \uc785\ub825: \n        \ud2b8\ub9ac \uad6c\uc870:\n              1\n            \/   \\\n          2      3\n         \/ \\    \/ \\\n        4   5  6   7\n\n        A = 6, B = 7\n        \ucd9c\ub825: 3  \/\/ \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1: 3\n    <\/pre>\n\ubb38\uc81c \ud480\uc774 \uacfc\uc815<\/h2>\n
1. \ud2b8\ub9ac \ub178\ub4dc \uad6c\uc870 \uc815\uc758<\/h3>\n\n        \uba3c\uc800 \uc774\uc9c4 \ud2b8\ub9ac\ub97c \ud45c\ud604\ud558\uae30 \uc704\ud55c \ub178\ub4dc \uad6c\uc870\ub97c \uc815\uc758\ud574\uc57c \ud569\ub2c8\ub2e4. \uac01 \ub178\ub4dc\ub294 \uc801\uc5b4\ub3c4 \ubd80\ubaa8 \ub178\ub4dc\uc640 \uc790\uc2dd \ub178\ub4dc\uc5d0 \ub300\ud55c \uc815\ubcf4\ub97c \uac00\uc838\uc57c \ud569\ub2c8\ub2e4. \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\uc5d0\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ubc29\uc2dd\uc73c\ub85c \ub178\ub4dc \uad6c\uc870\ub97c \uc815\uc758\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\n    <\/p>\n
\n    class TreeNode {\n        constructor(id) {\n            this.id = id;  \/\/ \ub178\ub4dc\uc758 ID\n            this.left = null;  \/\/ \uc67c\ucabd \uc790\uc2dd \ub178\ub4dc\n            this.right = null;  \/\/ \uc624\ub978\ucabd \uc790\uc2dd \ub178\ub4dc\n        }\n    }\n    <\/code><\/pre>\n2. \ud2b8\ub9ac \uc0dd\uc131<\/h3>\n\n        \ubb38\uc81c\uc758 \uc608\uc81c \ud2b8\ub9ac\ub97c \uc0dd\uc131\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc544\ub798 \ucf54\ub4dc\uc5d0\uc11c \ud2b8\ub9ac\ub97c \uad6c\ucd95\ud558\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.\n    <\/p>\n
\n    const root = new TreeNode(1);\n    root.left = new TreeNode(2);\n    root.right = new TreeNode(3);\n    root.left.left = new TreeNode(4);\n    root.left.right = new TreeNode(5);\n    root.right.left = new TreeNode(6);\n    root.right.right = new TreeNode(7);\n    <\/code><\/pre>\n3. \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1 \ucc3e\uae30<\/h3>\n\n        \uc774\uc81c \uc2e4\uc81c\ub85c LCA\ub97c \ucc3e\ub294 \ud568\uc218\ub97c \uad6c\ud604\ud569\ub2c8\ub2e4. \uc774\uc9c4 \ud2b8\ub9ac\uc5d0\uc11c \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \ucc3e\ub294 \uc77c\ubc18\uc801\uc778 \ubc29\ubc95\uc740 \uc7ac\uadc0\uc801\uc73c\ub85c \ud2b8\ub9ac\ub97c \ud0d0\uc0c9\ud558\uba74\uc11c, \ub450 \ub178\ub4dc A\uc640 B\uac00 \ubc1c\uacac\ub418\ub294 \uacbd\uc6b0 \ud574\ub2f9 \ub178\ub4dc\ub97c \ubc18\ud658\ud558\ub294 \ubc29\uc2dd\uc785\ub2c8\ub2e4.\n    <\/p>\n
\n    function findLCA(root, A, B) {\n        if (root === null) {\n            return null;\n        }\n\n        \/\/ \ud604\uc7ac \ub178\ub4dc\uac00 A \ub610\ub294 B\uc778 \uacbd\uc6b0\n        if (root.id === A || root.id === B) {\n            return root;\n        }\n\n        const leftLCA = findLCA(root.left, A, B);\n        const rightLCA = findLCA(root.right, A, B);\n\n        \/\/ \uc591\ucabd \uc790\uc2dd\uc5d0\uc11c LCA\uac00 \ubc1c\uacac\ub41c \uacbd\uc6b0, \ud604\uc7ac \ub178\ub4dc\uac00 LCA\n        if (leftLCA && rightLCA) {\n            return root;\n        }\n        \n        return leftLCA !== null ? leftLCA : rightLCA;\n    }\n    <\/code><\/pre>\n4. \ud568\uc218 \ud14c\uc2a4\ud2b8<\/h3>\n\n        \uc774\uc81c \uc791\uc131\ud55c LCA \ud568\uc218\ub97c \ud14c\uc2a4\ud2b8\ud574\ubd05\uc2dc\ub2e4. \ub2e4\uc74c \ucf54\ub4dc\ub85c \ud568\uc218\ub97c \ud638\ucd9c\ud558\uc5ec \uacb0\uacfc\ub97c \ucd9c\ub825\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\n    <\/p>\n
\n    const A = 4;\n    const B = 5;\n    const lcaNode = findLCA(root, A, B);\n\n    console.log(`\ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1: ${lcaNode.id}`);  \/\/ \ucd9c\ub825: \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1: 2\n    <\/code><\/pre>\n\ubcf5\uc7a1\ub3c4 \ubd84\uc11d<\/h2>\n\n        \uc774 \uc54c\uace0\ub9ac\uc998\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(N)\uc785\ub2c8\ub2e4. \uc5ec\uae30\uc11c N\uc740 \ub178\ub4dc\uc758 \uc218\uc785\ub2c8\ub2e4. \ubaa8\ub4e0 \ub178\ub4dc\ub97c \ud55c \ubc88\uc529 \ubc29\ubb38\ud574\uc57c \ud558\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \uacf5\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(H)\ub85c, H\ub294 \ud2b8\ub9ac\uc758 \ub192\uc774\uc785\ub2c8\ub2e4. \ucd5c\uc545\uc758 \uacbd\uc6b0\uc5d0\ub294 H\uac00 N\uc5d0 \uac00\uae4c\uc6b8 \uc218 \uc788\uc2b5\ub2c8\ub2e4 (\ud2b8\ub9ac\uac00 \ud3b8\ud5a5\ub41c \uacbd\uc6b0).\n    <\/p>\n
\uacb0\ub860<\/h2>\n\n        \uc774\ubc88 \uac15\uc88c\uc5d0\uc11c\ub294 \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub97c \uc774\uc6a9\ud558\uc5ec \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1\uc744 \ucc3e\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc790\uc138\ud788 \uc54c\uc544\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \uc774 \uac1c\ub150\uc740 \ub2e4\uc591\ud55c \ud2b8\ub9ac \uad00\ub828 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \ub370 \uc911\uc694\ud55c \uae30\ucd08\uac00 \ub418\uba70, \ud2b8\ub9ac \ud0d0\uc0c9 \uc54c\uace0\ub9ac\uc998\uc744 \uc774\ud574\ud558\ub294 \ub370 \ub3c4\uc6c0\uc744 \uc904 \uac83\uc785\ub2c8\ub2e4. \uc2e4\uc81c \ucf54\ub529\ud14c\uc2a4\ud2b8\ub098 \uba74\uc811\uc5d0\uc11c \uc790\uc8fc \ucd9c\uc81c\ub418\ubbc0\ub85c \ubc18\ub4dc\uc2dc \uc219\uc9c0\ud574\ub450\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4. \ub2e4\uc74c \uac15\uc88c\uc5d0\uc11c\ub294 \ub2e4\ub978 \ud2b8\ub9ac \uad00\ub828 \ubb38\uc81c\ub97c \ub2e4\ub8f0 \uc608\uc815\uc774\ub2c8 \uae30\ub300\ud574 \uc8fc\uc138\uc694!\n    <\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
\ubb38\uc81c \uc124\uba85 \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1(LCA, Lowest Common Ancestor)\uc740 \ub450 \ub178\ub4dc\uc758 \uac00\uc7a5 \ucd5c\uadfc \uc870\uc0c1 \ub178\ub4dc\ub97c \ucc3e\ub294 \ubb38\uc81c\uc785\ub2c8\ub2e4. \uc774 \ubb38\uc81c\ub294 \ud2b8\ub9ac \uc790\ub8cc\uad6c\uc870\uc5d0\uc11c \ub9e4\uc6b0 \uc911\uc694\ud558\uba70, \ucf54\ub529 \ud14c\uc2a4\ud2b8 \ubc0f \uba74\uc811\uc5d0\uc11c\ub3c4 \uc790\uc8fc \ucd9c\uc81c\ub418\ub294 \uc8fc\uc81c\uc785\ub2c8\ub2e4. \uc774 \uac15\uc88c\uc5d0\uc11c\ub294 \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub97c \uc774\uc6a9\ud574 LCA\ub97c \ucc3e\ub294 \ubc29\ubc95\uc744 \ub2e4\ub8e8\uace0, \uc2e4\uc81c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \uacfc\uc815\uc744 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ubb38\uc81c \uc815\uc758 \uc8fc\uc5b4\uc9c4 \uc774\uc9c4 \ud2b8\ub9ac\uc640 \ub450 \ub178\ub4dc A\uc640 B\uac00 \uc788\uc744 \ub54c, \ub450 … \ub354 \ubcf4\uae30 “\uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1 \uad6c\ud558\uae30 1”<\/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":[26],"tags":[],"class_list":["post-27889","post","type-post","status-publish","format-standard","hentry","category-26"],"yoast_head":"\n\uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \ucd5c\uc18c \uacf5\ud1b5 \uc870\uc0c1 \uad6c\ud558\uae30 1 - 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