{"id":27142,"date":"2024-10-27T13:44:00","date_gmt":"2024-10-27T13:44:00","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=27142"},"modified":"2024-11-26T07:21:25","modified_gmt":"2024-11-26T07:21:25","slug":"%ed%8c%8c%ec%9d%b4%ec%8d%ac-%ec%bd%94%eb%94%a9%ed%85%8c%ec%8a%a4%ed%8a%b8-%ea%b0%95%ec%a2%8c-%ec%9c%a0%eb%8b%88%ec%98%a8-%ed%8c%8c%ec%9d%b8%eb%93%9c","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/27142\/","title":{"rendered":"\ud30c\uc774\uc36c \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc"},"content":{"rendered":"<p><body><\/p>\n<p>\uc548\ub155\ud558\uc138\uc694! \uc774\ubc88 \ud3ec\uc2a4\ud2b8\uc5d0\uc11c\ub294 \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc(Union-Find) \uc54c\uace0\ub9ac\uc998\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uace0, \uc774\ub97c \ud65c\uc6a9\ud55c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ud480\uc774\ud574 \ubcf4\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4. \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub294 \uc11c\ub85c\uc18c \uc9d1\ud569\uc744 \uad00\ub9ac\ud558\ub294\ub370 \ub9e4\uc6b0 \uc720\uc6a9\ud55c \uc790\ub8cc\uad6c\uc870\ub85c, \uc5ec\ub7ec \ud56d\ubaa9\ub4e4\uc758 \uc5f0\uacb0 \uc5ec\ubd80\ub97c \ube60\ub974\uac8c \ud310\ub2e8\ud558\uace0 \uc9d1\ud569\uc744 \ud569\uce58\ub294 \uae30\ub2a5\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4.<\/p>\n<h2>\uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub780?<\/h2>\n<p>\uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub294 \ud06c\uac8c \ub450 \uac00\uc9c0 \uae30\ub2a5\uc73c\ub85c \uad6c\uc131\ub429\ub2c8\ub2e4:<\/p>\n<ul>\n<li><strong>Union<\/strong>: \ub450 \uc6d0\uc18c\uac00 \uc18d\ud55c \uc9d1\ud569\uc744 \ud558\ub098\ub85c \ud569\uce58\ub294 \uc5f0\uc0b0<\/li>\n<li><strong>Find<\/strong>: \ud2b9\uc815 \uc6d0\uc18c\uac00 \uc5b4\ub290 \uc9d1\ud569\uc5d0 \uc18d\ud558\ub294\uc9c0 \ucc3e\ub294 \uc5f0\uc0b0<\/li>\n<\/ul>\n<p>\uc774 \ub450 \uc6b4\uc601\uc744 \ud1b5\ud558\uc5ec, \uc6b0\ub9ac\ub294 \uc5ec\ub7ec \uc694\uc18c \uac04\uc758 \uad00\uacc4\ub97c \uc27d\uac8c \uad00\ub9ac\ud560 \uc218 \uc788\uc73c\uba70, \ubcf5\uc7a1\ud55c \uc5f0\uacb0 \ubb38\uc81c\ub97c \ud6a8\uc728\uc801\uc73c\ub85c \ud574\uacb0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud2b9\ud788, \uadf8\ub798\ud504 \ubb38\uc81c\ub098 \ub124\ud2b8\uc6cc\ud06c \uc5f0\uacb0 \ubb38\uc81c\uc5d0\uc11c \uc720\uc6a9\ud558\uac8c \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/p>\n<h2>\uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\uc758 \uc791\ub3d9 \uc6d0\ub9ac<\/h2>\n<p>\uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub294 \uc8fc\ub85c \ub450 \uac00\uc9c0 \uae30\ubc95\uc744 \uc0ac\uc6a9\ud558\uc5ec \ud6a8\uc728\uc131\uc744 \uadf9\ub300\ud654\ud569\ub2c8\ub2e4:<\/p>\n<h3>1. \uacbd\ub85c \uc555\ucd95(Path Compression)<\/h3>\n<p>Find \uc5f0\uc0b0\uc744 \uc218\ud589\ud560 \ub54c, \uacbd\ub85c\ub97c \uc555\ucd95\ud558\uc5ec \ud2b8\ub9ac\uc758 \ub192\uc774\ub97c \uc904\uc785\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574, \uc5ec\ub7ec \ubc88\uc758 Find\ub97c \uc218\ud589\ud560 \ub54c \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub97c \uac10\uc18c\uc2dc\ud0ac \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>2. Union by Rank<\/h3>\n<p>Union \uc5f0\uc0b0 \uc2dc \uc9d1\ud569\uc758 &#8216;\ub7ad\ud06c(\ub192\uc774)&#8217;\ub97c \uace0\ub824\ud558\uc5ec, \ub354 \ub0ae\uc740 \ub7ad\ud06c\uc758 \uc9d1\ud569\uc744 \ub192\uc740 \ub7ad\ud06c\uc758 \uc9d1\ud569\uc5d0 \ubd99\uc785\ub2c8\ub2e4. \uc774 \ubc29\ubc95 \ub610\ud55c \ud2b8\ub9ac\uc758 \uae4a\uc774\ub97c \uc904\uc5ec \uc5f0\uc0b0\uc758 \ud6a8\uc728\uc131\uc744 \ub192\uc785\ub2c8\ub2e4.<\/p>\n<h2>\ubb38\uc81c: \uc5f0\uacb0 \uc694\uc18c\uc758 \uac1c\uc218 \uad6c\ud558\uae30<\/h2>\n<p>\ub2e4\uc74c\uacfc \uac19\uc740 \ubb38\uc81c\ub97c \uace0\ub824\ud574 \ubcf4\uc138\uc694:<\/p>\n<blockquote>\n<p>\uc8fc\uc5b4\uc9c4 n\uac1c\uc758 \ub178\ub4dc\uc640 m\uac1c\uc758 \uac04\uc120\uc774 \uc788\uc744 \ub54c, \uc11c\ub85c \uc5f0\uacb0\ub41c \ub178\ub4dc \uc9d1\ud569\uc758 \uac1c\uc218\ub97c \uad6c\ud558\uc2dc\uc624. \ub178\ub4dc\ub294 0\ubd80\ud130 n-1\uae4c\uc9c0\uc758 \uc815\uc218\ub97c \uac00\uc9c0\uba70, \uac04\uc120 \uc815\ubcf4\ub294 (a, b)\uc758 \ud615\ud0dc\ub85c \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\n<\/blockquote>\n<h3>\uc785\ub825 \uc608\uc2dc<\/h3>\n<pre>\n    5 3\n    0 1\n    1 2\n    3 4\n    <\/pre>\n<h3>\ucd9c\ub825 \uc608\uc2dc<\/h3>\n<pre>\n    2\n    <\/pre>\n<h2>\ud574\uacb0 \uacfc\uc815<\/h2>\n<p>\uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc \uc790\ub8cc\uad6c\uc870\ub97c \ud65c\uc6a9\ud558\uc5ec \uac01 \ub178\ub4dc\uc758 \uad00\uacc4\ub97c \uc815\ub9ac\ud560 \uac83\uc785\ub2c8\ub2e4. \uc544\ub798 \ub2e8\uacc4\ub97c \ub530\ub77c \uc9c4\ud589\ud558\uaca0\uc2b5\ub2c8\ub2e4:<\/p>\n<h3>1\ub2e8\uacc4: \ubd80\ubaa8 \ubc30\uc5f4 \ucd08\uae30\ud654<\/h3>\n<p>\uac01 \ub178\ub4dc\ub294 \uc790\uae30 \uc790\uc2e0\uc744 \ubd80\ubaa8\ub85c \uac00\uc9c0\ub294 \uc0c1\ud0dc\ub85c \ucd08\uae30\ud654\ud569\ub2c8\ub2e4. \uc989, \ubd80\ubaa8 \ubc30\uc5f4\uc744 \uc0dd\uc131\ud558\uace0 \uac01 \ub178\ub4dc\uac00 \uc790\uae30 \uc790\uc2e0\uc744 \uac00\ub9ac\ud0a4\ub3c4\ub85d \uc124\uc815\ud569\ub2c8\ub2e4.<\/p>\n<pre>\n    parent = [0, 1, 2, 3, 4]  # \ub178\ub4dc \uc218\uc5d0 \ub9de\ucdb0 \ucd08\uae30\ud654\n    <\/pre>\n<h3>2\ub2e8\uacc4: Union \uc5f0\uc0b0 \uc218\ud589<\/h3>\n<p>\uc8fc\uc5b4\uc9c4 \uac04\uc120 \uc815\ubcf4\ub97c \uae30\ubc18\uc73c\ub85c Union \uc5f0\uc0b0\uc744 \ud1b5\ud574 \ub178\ub4dc\ub4e4\uc744 \uc5f0\uacb0\ud569\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \uc11c\ub85c \uc5f0\uacb0\ub41c \uc9d1\ud569\uc744 \ud558\ub098\ub85c \ubb36\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>3\ub2e8\uacc4: Find \uc5f0\uc0b0\uc744 \ud1b5\ud574 \uc5f0\uacb0\ub41c \uc9d1\ud569 \uce74\uc6b4\ud305<\/h3>\n<p>\uac01 \ub178\ub4dc\uc5d0 \ub300\ud574 Find \uc5f0\uc0b0\uc744 \uc218\ud589\ud558\uc5ec \uc5b4\ub5a4 \uc9d1\ud569\uc5d0 \uc18d\ud558\ub294\uc9c0\ub97c \ud655\uc778\ud558\uace0, \uc720\uc77c\ud55c \ub8e8\ud2b8 \ub178\ub4dc\uc758 \uac1c\uc218\ub97c \uc13c \ud6c4 \uacb0\uacfc\ub97c \ucd9c\ub825\ud569\ub2c8\ub2e4.<\/p>\n<h2>\uad6c\ud604<\/h2>\n<p>\uc774\uc81c \uc704\uc758 \uacfc\uc815\ub4e4\uc744 \ud30c\uc774\uc36c \ucf54\ub4dc\ub85c \uad6c\ud604\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<pre>\n    class UnionFind:\n        def __init__(self, size):\n            self.parent = list(range(size))\n            self.rank = [1] * size\n        \n        def find(self, p):\n            if self.parent[p] != p:\n                # \uacbd\ub85c \uc555\ucd95\n                self.parent[p] = self.find(self.parent[p])\n            return self.parent[p]\n        \n        def union(self, p, q):\n            rootP = self.find(p)\n            rootQ = self.find(q)\n            \n            if rootP != rootQ:\n                # Union by rank\n                if self.rank[rootP] &gt; self.rank[rootQ]:\n                    self.parent[rootQ] = rootP\n                elif self.rank[rootP] &lt; self.rank[rootQ]:\n                    self.parent[rootP] = rootQ\n                else:\n                    self.parent[rootQ] = rootP\n                    self.rank[rootP] += 1\n\n    # \uc0ac\uc6a9 \uc608\uc81c\n    def count_connected_components(n, edges):\n        uf = UnionFind(n)\n        \n        # \uac04\uc120 \uc815\ubcf4\ub85c Union \uc218\ud589\n        for u, v in edges:\n            uf.union(u, v)\n        \n        # \uc720\uc77c\ud55c \ub8e8\ud2b8\uc758 \uc218\ub97c \uc138\uc5b4 \uc5f0\uacb0 \uad6c\uc131 \uc694\uc18c\uc758 \uac1c\uc218\ub97c \ubc18\ud658\n        root_set = set(uf.find(i) for i in range(n))\n        return len(root_set)\n\n    # \uc785\ub825 \ucc98\ub9ac\n    n = 5\n    edges = [(0, 1), (1, 2), (3, 4)]\n    print(count_connected_components(n, edges))  # \ucd9c\ub825: 2\n    <\/pre>\n<h2>\uacb0\uacfc \ud574\uc11d<\/h2>\n<p>\uc704 \ucf54\ub4dc\ub97c \uc2e4\ud589\ud558\uba74 2\ub77c\ub294 \uacb0\uacfc\uac00 \ucd9c\ub825\ub429\ub2c8\ub2e4. \uc774\ub294 \uc8fc\uc5b4\uc9c4 \uadf8\ub798\ud504\uc5d0\uc11c \uc11c\ub85c \uc5f0\uacb0\ub41c \ub178\ub4dc \uc9d1\ud569\uc774 \ub450 \uac1c \uc874\uc7ac\ud568\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/p>\n<h2>\uc2dc\uac04 \ubcf5\uc7a1\ub3c4 \ubd84\uc11d<\/h2>\n<p>\uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub97c \uc0ac\uc6a9\ud588\uc744 \ub54c, \uac01 \uc6b4\uc601\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 \uac70\uc758 O(\u03b1(n))\uc5d0 \uac00\uae4c\uc6cc\uc9c0\uba70, \uc5ec\uae30\uc11c \u03b1\ub294 \uc544\ucee4\ub9cc \ud568\uc218\uc758 \uc5ed\ud568\uc218\uc785\ub2c8\ub2e4. \uc774\ub294 \ub9e4\uc6b0 \ub290\ub9ac\uac8c \uc99d\uac00\ud558\ub294 \ud568\uc218\uc774\ubbc0\ub85c, \uc2e4\uc81c\ub85c\ub294 \uc0c1\uc218\uc5d0 \uac00\uae4c\uc6b4 \uc2dc\uac04\uc744 \uc18c\uc694\ud55c\ub2e4\uace0 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>\ub9c8\ubb34\ub9ac<\/h2>\n<p>\uc774\ubc88 \ud3ec\uc2a4\ud2b8\uc5d0\uc11c\ub294 \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc \uc790\ub8cc\uad6c\uc870\uc640 \uc774\ub97c \ud65c\uc6a9\ud55c \ubb38\uc81c \ud574\uacb0 \ubc29\ubc95\uc744 \uc0b4\ud3b4\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub97c \ud1b5\ud574 \ubcf5\uc7a1\ud55c \uc5f0\uacb0 \ubb38\uc81c\ub97c \ud6a8\uc728\uc801\uc73c\ub85c \ud574\uacb0\ud560 \uc218 \uc788\uc74c\uc744 \ud655\uc778\ud588\ub294\ub370\uc694, \ub2e4\uc591\ud55c \uc751\uc6a9\uc744 \ud574\ubcf4\uba70 \uc5f0\uc2b5\ud574 \ubcf4\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n<p>\uac10\uc0ac\ud569\ub2c8\ub2e4!<\/p>\n<p><\/body><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uc548\ub155\ud558\uc138\uc694! \uc774\ubc88 \ud3ec\uc2a4\ud2b8\uc5d0\uc11c\ub294 \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc(Union-Find) \uc54c\uace0\ub9ac\uc998\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uace0, \uc774\ub97c \ud65c\uc6a9\ud55c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ud480\uc774\ud574 \ubcf4\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4. \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub294 \uc11c\ub85c\uc18c \uc9d1\ud569\uc744 \uad00\ub9ac\ud558\ub294\ub370 \ub9e4\uc6b0 \uc720\uc6a9\ud55c \uc790\ub8cc\uad6c\uc870\ub85c, \uc5ec\ub7ec \ud56d\ubaa9\ub4e4\uc758 \uc5f0\uacb0 \uc5ec\ubd80\ub97c \ube60\ub974\uac8c \ud310\ub2e8\ud558\uace0 \uc9d1\ud569\uc744 \ud569\uce58\ub294 \uae30\ub2a5\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4. \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub780? \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub294 \ud06c\uac8c \ub450 \uac00\uc9c0 \uae30\ub2a5\uc73c\ub85c \uad6c\uc131\ub429\ub2c8\ub2e4: Union: \ub450 \uc6d0\uc18c\uac00 \uc18d\ud55c \uc9d1\ud569\uc744 \ud558\ub098\ub85c \ud569\uce58\ub294 \uc5f0\uc0b0 Find: \ud2b9\uc815 \uc6d0\uc18c\uac00 \uc5b4\ub290 \uc9d1\ud569\uc5d0 &hellip; <a href=\"https:\/\/atmokpo.com\/w\/27142\/\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;\ud30c\uc774\uc36c \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc&#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":[23],"tags":[],"class_list":["post-27142","post","type-post","status-publish","format-standard","hentry","category-23"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\ud30c\uc774\uc36c \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc - \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\/27142\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\ud30c\uc774\uc36c \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"\uc548\ub155\ud558\uc138\uc694! \uc774\ubc88 \ud3ec\uc2a4\ud2b8\uc5d0\uc11c\ub294 \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc(Union-Find) \uc54c\uace0\ub9ac\uc998\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uace0, \uc774\ub97c \ud65c\uc6a9\ud55c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ud480\uc774\ud574 \ubcf4\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4. \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub294 \uc11c\ub85c\uc18c \uc9d1\ud569\uc744 \uad00\ub9ac\ud558\ub294\ub370 \ub9e4\uc6b0 \uc720\uc6a9\ud55c \uc790\ub8cc\uad6c\uc870\ub85c, \uc5ec\ub7ec \ud56d\ubaa9\ub4e4\uc758 \uc5f0\uacb0 \uc5ec\ubd80\ub97c \ube60\ub974\uac8c \ud310\ub2e8\ud558\uace0 \uc9d1\ud569\uc744 \ud569\uce58\ub294 \uae30\ub2a5\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4. \uc720\ub2c8\uc628 \ud30c\uc778\ub4dc\ub780? 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