{"id":806,"date":"2023-02-26T23:28:53","date_gmt":"2023-02-26T14:28:53","guid":{"rendered":"http:\/\/mukgee.com\/?p=806"},"modified":"2023-02-26T23:50:14","modified_gmt":"2023-02-26T14:50:14","slug":"leetcode310-minimum-height-trees","status":"publish","type":"post","link":"http:\/\/mukgee.com\/?p=806","title":{"rendered":"[leetcode]310. Minimum Height Trees"},"content":{"rendered":"<p><a href=\"https:\/\/leetcode.com\/problems\/minimum-height-trees\/\" target=\"_blank\" rel=\"noopener\">https:\/\/leetcode.com\/problems\/minimum-height-trees\/<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>\ud2b8\ub9ac \ubb38\uc81c\ub85c \ucc98\uc74c\uc5d0\ub294 \ubaa8\ub4e0 \ub178\ub4dc\ub97c dfs \ub85c \ud0d0\uc0c9\ud558\uba70 \uac00\uc7a5 height \uac00 \ub0ae\uc740 label \uc744 \uad00\ub9ac\ud558\ub294\uc2dd\uc73c\ub85c \uc811\uadfc\ud588\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\ub2f9\uc5f0\ud788 Time out \uc774 \ubc1c\uc0dd\ud588\uace0\uc694.. O( N * (N+ E) )<\/p>\n<p>&nbsp;<\/p>\n<p>\ub2e4\ub978 \ubc29\ubc95\uc774 \ub5a0\uc624\ub974\uc9c0 \uc54a\uc544 \uc54c\uace0\ub9ac\uc998 \ud2b8\ub808\uc774\ub2dd \ucc45\uc5d0 \uc18c\uac1c\ub41c Tree \uc54c\uace0\ub9ac\uc998 \ud3b8\uc744 \ucc38\uace0\ud574\uc11c \uad6c\ud604\ud588\uc2b5\ub2c8\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p>\ud575\uc2ec\uc740 \ud2b8\ub9ac\uc758 \uc9c0\ub984\uc744 \uad6c\ud558\uace0 \uc9c0\ub984\uc758 \uc911\uac04\uc5d0 \uc704\uce58\ud55c Node \uac00\u00a0 MHTs&#8217; root labels \uc785\ub2c8\ub2e4.<\/p>\n<p>( \uc9c0\ub984\uc758 \uc911\uac04\uc774 2\ub85c \ub098\ub204\ub294 \uac1c\ub150\uc774\uae30 \ub54c\ubb38\uc5d0 \uc9c0\ub984\uc758 \uae38\uc774\uac00 \uc9dd\uc218\uba74 MHTs&#8217; root labels\uc740 1\uac1c , \ud640\uc218\uba74 2\uac1c )<\/p>\n<p>&nbsp;<\/p>\n<p>\uadf8\ub7fc \ud2b8\ub9ac\uc758 \uc9c0\ub984\uc744 \uad6c\ud558\ub294 \ubc29\ubc95\ubd80\ud130 \uc54c\uc544\ubd10\uc57c\ud569\ub2c8\ub2e4.<\/p>\n<p>\ucc45\uc5d0\uc11c \uc9c0\ub984\uc744 \uad6c\ud558\ub294 2\uac00\uc9c0 \ubc29\ubc95\uc744 \uc18c\uac1c\ud558\uc9c0\ub9cc \uc800\ub294 \uac04\ub2e8\ud558\uba74\uc11c \uc544\ub984\ub2e4\uc6b4 \ubc29\ubc95\uc778 2\ubc88\uc9f8 \ubc29\ubc95\uc73c\ub85c \uc811\uadfc\ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<ol>\n<li>\ub79c\ub364\uc758 \ub178\ub4dc(a)\uc5d0\uc11c \uc2dc\uc791\ud574\uc11c a \uc5d0\uc11c \uac00\uc7a5 \uba3c \ub178\ub4dc(b)\ub97c \ud0d0\uc0c9\ud569\ub2c8\ub2e4.<\/li>\n<li>\uc704\uc5d0\uc11c \ucc3e\uc740 b \uc5d0\uc11c \ud0d0\uc0c9\uc744 \uc2dc\uc791\ud574\uc11c \ub2e4\uc2dc \uac00\uc7a5 \uba3c \ub178\ub4dc(c)\ub97c \ud0d0\uc0c9\ud569\ub2c8\ub2e4.<\/li>\n<li>b \uc640 c\uc758 \uac70\ub9ac\uac00 \ud2b8\ub9ac\uc758 \uc9c0\ub984\uc785\ub2c8\ub2e4.<\/li>\n<\/ol>\n<p><img loading=\"lazy\" class=\"alignnone wp-image-807\" src=\"http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.21.52.png\" alt=\"\" width=\"649\" height=\"261\" srcset=\"http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.21.52.png 706w, http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.21.52-300x121.png 300w\" sizes=\"(max-width: 649px) 100vw, 649px\" \/><\/p>\n<p>\uc774\ub807\uac8c BFS \ud639\uc740 DFS 2\ubc88 \ud0d0\uc0c9\ud558\uba74 \ud2b8\ub9ac\uc758 \uc9c0\ub984\uc744 \uad6c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\ucc45\uc5d0\uc11c\ub294 \ud2b8\ub9ac\uc758 \uc9c0\ub984\uc744 \uc774\ub8e8\ub294 \uacbd\ub85c\uac00 \uc218\ud3c9\uc73c\ub85c \uc704\uce58\ud558\uace0 \ub2e4\ub978 \ub178\ub4dc\uac00 \ub9e4\ub2ec\ub9b0 \ud615\ud0dc\ub85c \ud2b8\ub9ac\uac00 \ub2e4\uc2dc \uadf8\ub824\uc9c0\uae30 \ub54c\ubb38\uc5d0 \ub178\ub4dc b \ub97c \uc9c0\ub984\uc758 \ud55c \ub05d\uc73c\ub85c \uc0bc\ub294\uac83\ub294 \ud56d\uc0c1 \uc62c\ubc14\ub978 \uc120\ud0dd\uc774 \ub41c\ub2e4\uace0 \ud569\ub2c8\ub2e4.<\/p>\n<p>( \uc774 \uc54c\uace0\ub9ac\uc998\uc774 \uc65c \ub3d9\uc791\ud558\ub294\uc9c0\ub294 \ub2e4\uc591\ud55c \ube14\ub85c\uadf8\uc5d0\uc11c \ub354 \uc790\uc138\ud558\uac8c \ud639\uc740 \ubcf5\uc7a1\ud558\uac8c \uc124\uba85\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4 )<\/p>\n<p>\uc2e4\uc81c\ub85c \uc774 \ucc45\uc5d0\uc11c\ub294 \uc774 \uc54c\uace0\ub9ac\uc998\uc774 \uc544\uc8fc \uc544\ub984\ub2f5\ub2e4\uace0 \ud45c\ud604\ud558\ub294\ub370 \uae30\uc5b5\ud558\uae30 \uac04\ub2e8\ud558\uae30 \ub54c\ubb38\uc5d0 \ud2b8\ub9ac\uc758 \uc9c0\ub984 \uad6c\ud558\ub294 \ubc29\ubc95\uc740 \uc774 \ubc29\ubc95\uc73c\ub85c \uae30\uc5b5\ud558\ub824\uace0 \ud569\ub2c8\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p>\ub2e4\uc2dc 310\ubc88 \ubb38\uc81c\ub85c \ub3cc\uc544\uac00\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\uc9c0\ub984\uc758 \uc911\uac04\uc774 MHTs&#8217; root labels \uc774\uae30 \ub54c\ubb38\uc5d0 \ubb38\uc81c\ub97c 2\uac00\uc9c0\ub85c \uc811\uadfc\ud574\ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<ol>\n<li>\uc9c0\ub984\uc744 \uad6c\ud558\uace0 \uc9c0\ub984\uc5d0 \ud574\ub2f9\ud558\ub294 \uacbd\ub85c\ub97c \ucc3e\uc544 \uacbd\ub85c\uc758 \uc911\uac04 \uac12\uc744 \ubc18\ud658\ud55c\ub2e4.<\/li>\n<li>\uc9c0\ub984\uc5d0 \ud574\ub2f9\ud558\ub294 \uc591 \ub05d \ub178\ub4dc\ub97c \uae30\uc900\uc73c\ub85c \uc591\ub05d \ub178\ub4dc\uac04\uc758 \uac70\ub9ac\ub97c \uad6c\ud574\uc11c \ucd5c\uc18c\uac00 \ub418\ub294 \ub178\ub4dc\ub97c \ubc18\ud658\ud55c\ub2e4.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>\uc800\ub294 2\ubc88\uc774 \uc774\ud574\ud558\uae30 \uc880 \ub354 \uac04\ub2e8\ud558\uae30 \ub54c\ubb38\uc5d0 2\ubc88\uc73c\ub85c \ubb38\uc81c\ub97c \ud480\uc5b4\ubcf4\uc558\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\uc9c0\ub984\uc758 \uc591\ub05d\uc5d0\uc11c \uac01 \ub178\ub4dc\uac04\uc758 \uac70\ub9ac\ub97c dp \ub85c \uad6c\ud574\ud558\uae30 \uc704\ud574 \ucd1d DFS \ub97c 3\ubc88 \ud0d0\uc0c9\ud588\uc2b5\ub2c8\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" class=\"alignnone wp-image-811\" src=\"http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.32.46.png\" alt=\"\" width=\"946\" height=\"176\" srcset=\"http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.32.46.png 1000w, http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.32.46-300x56.png 300w, http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.32.46-768x143.png 768w\" sizes=\"(max-width: 946px) 100vw, 946px\" \/><\/p>\n<p>\uadf8\ub9ac\uace0 \uac01 node \uc5d0\uc11c \uc9c0\ub984\uc758 \uc591\ucabd \ub05d\uae4c\uc9c0\uc758 \uac70\ub9ac \uc911 max \uac12\uc744 \uacc4\uc0b0\ud558\uc5ec \uac01 node \uac00 root \uac00 \ub418\uc5c8\uc744\ub54c\uc758 tree height( \uc9c0\ub984\uc758 \uc591\ub05d\uae4c\uc9c0 \uc911 \uac00\uc7a5 \uba3c \uac70\ub9ac) \ub97c \ud655\uc778\ud569\ub2c8\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p>\uc774\ubc88 \ubb38\uc81c\ub294 \ud2b8\ub9ac\uc758 \uae30\ubcf8\uc801\uc778 \ud0d0\uc0c9 \ubfd0\ub9cc \uc544\ub2c8\ub77c \ud2b8\ub9ac\uc758 \uc8fc\uc694 \ud2b9\uc131\uc744 \ucda9\ubd84\ud788 \uc774\ud574\ud560\ub54c \ud480 \uc218 \uc788\ub294 \ubb38\uc81c\uc778\uac83 \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\ud2b8\ub9ac\uc758 \uc9c0\ub984 \uad6c\ud558\uae30 \ubfd0\ub9cc \uc544\ub2c8\ub77c \ud2b8\ub9ac\uc758 \uc11c\ube0c\ud2b8\ub9ac \uc9c8\uc758\/ \uacbd\ub85c \uc9c8\uc758 \uac19\uc740 \ucd94\uac00\uc801\uc778 \ud2b8\ub9ac \uae30\ubcf8 \uae30\uc220\ub4e4\uc744 \ud559\uc2b5 \ud574\uc57c\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p>\ubb3c\ub860 \uac00\uc7a5 \uae30\ubcf8 \ub418\ub294 \ud2b8\ub9ac\uc758 \uc6a9\uc5b4\ub098 \ud0d0\uc0c9 \ubc29\ubc95\uc5d0 \ub300\ud574\uc11c\ub3c4 \uae30\uc5b5\ud574\uc57c\ud569\ub2c8\ub2e4. (\uc544\ub798\ub294 \uc774\uc804 \uadf8\ub798\ud504 \uad00\ub828 \ubb38\uc81c)<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"ViRkGdKqzc\"><p><a href=\"http:\/\/mukgee.com\/?p=766\">[leetcode]207. Course Schedule<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;[leetcode]207. Course Schedule&#8221; &#8212; sungjin&#039; blog\" src=\"http:\/\/mukgee.com\/?p=766&#038;embed=true#?secret=ViRkGdKqzc\" data-secret=\"ViRkGdKqzc\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p>\uc81c\ucd9c \ucf54\ub4dc : <a href=\"https:\/\/github.com\/sok891111\/leetcode\/blob\/main\/310.%20Minimum%20Height%20Trees.py\" target=\"_blank\" rel=\"noopener\">https:\/\/github.com\/sok891111\/leetcode\/blob\/main\/310.%20Minimum%20Height%20Trees.py<\/a><\/p>\n<p>\uc81c\uac00 \uc81c\ucd9c\ud55c \ucf54\ub4dc\ub294 DFS \ub97c 3\ubc88 \ud0d0\uc0c9\ud558\uae30 \ub54c\ubb38\uc5d0 \uc18d\ub3c4\uac00 \ube60\ub974\uc9c0\ub294 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p>chatGPT \uc5d0\uac8c \uc774\ubc88 \ubb38\uc81c\ub97c \ubb3c\uc5b4\ubd24\uc744\ub54c O(n) \uc2dc\uac04\ubcf5\uc7a1\ub3c4\ub97c \uac00\uc9c4 \uc54c\uace0\ub9ac\uc998\uc744 \uc54c\ub824\uc8fc\ub124\uc694.<\/p>\n<p>\uc811\uadfc\ubc95 \uc790\uccb4\ub294 \uc9c0\ub984\uc758 \uc911\uc2ec\uc740 1\uac1c \ud639\uc740 2\uac1c \uc5ec\uc11c \ud2b8\ub9ac\uc758 leaf( \ud2b8\ub9ac\uc758 \ucc28\uc218\uac00 1, \uc989 \uc790\uc2dd \ub178\ub4dc\uac00 \uc5c6\ub294 \ub178\ub4dc )\ub97c \ub178\ub4dc\uac00 2\uac1c \uc774\ud558 \ub0a8\uc744\ub54c\uae4c\uc9c0 \uc798\ub77c \ub098\uac00\ub2e4 \ubcf4\uba74 \ud2b8\ub9ac\uc758 \uc911\uc2ec( \uc9c0\ub984\uc758 \uc911\uac04) \uc5d0 \ub3c4\ucc29\ud55c\ub2e4\ub294 \uc811\uadfc\ubc95 \uc785\ub2c8\ub2e4.<\/p>\n<p>\ud2b8\ub9ac\ub97c \uac00\uc7a5\uc790\ub9ac\ubd80\ud130 \uacc4\uc18d \uc798\ub77c \ub098\uac00\ub2e4\ubcf4\uba74 \uc911\uc2ec\uc5d0 \ub3c4\ucc29\ud560 \uc218 \uc788\ub2e4\ub294 \uc811\uadfc\ubc95\uc774\ub124\uc694. ( \uc544\ub984\ub2e4\uc6b4 \uc54c\uace0\ub9ac\uc998\uc785\ub2c8\ub2e4.)<\/p>\n<p><img loading=\"lazy\" class=\"alignnone wp-image-812\" src=\"http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.41.51.png\" alt=\"\" width=\"596\" height=\"744\" srcset=\"http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.41.51.png 1312w, http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.41.51-240x300.png 240w, http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.41.51-820x1024.png 820w, http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.41.51-768x959.png 768w, http:\/\/mukgee.com\/wp-content\/uploads\/2023\/02\/\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba-2023-02-26-\u110b\u1169\u1112\u116e-11.41.51-1230x1536.png 1230w\" sizes=\"(max-width: 596px) 100vw, 596px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>\ub9c8\uc9c0\ub9c9\uc73c\ub85c python \uc5d0\uc11c \uc77c\ubc18 array \ubcf4\ub2e4 \ud050\uc758 insert, delete \uc5d0\uc11c deque \uac00 \ub354 \ube60\ub974\ub2e4\uace0 \ud569\ub2c8\ub2e4.<\/p>\n<p>\uac00\ub2a5\ud558\uba74 deque \ub97c \uc0ac\uc6a9\ud558\ub294 \uc2b5\uad00\uc744 \uac00\uc838\ubcf4\ub824\uace0 \ud569\ub2c8\ub2e4. \ub610\ud55c DFS \uad6c\ud604\uc2dc visited \ubcc0\uc218\ub294 set \uc73c\ub85c \uad6c\ud604\ud558\ub294\uac8c \ud6e8\uc52c \ube60\ub985\ub2c8\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\ucc38\uace0 : <a href=\"https:\/\/www.weeklyps.com\/entry\/%ED%8A%B8%EB%A6%AC%EC%9D%98-%EC%A7%80%EB%A6%84#d2\" target=\"_blank\" rel=\"noopener\">https:\/\/www.weeklyps.com\/entry\/%ED%8A%B8%EB%A6%AC%EC%9D%98-%EC%A7%80%EB%A6%84#d2<\/a><\/p>\n<p>\uc54c\uace0\ub9ac\uc998 \ud2b8\ub808\uc774\ub2dd \ucc45.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/leetcode.com\/problems\/minimum-height-trees\/ &nbsp; \ud2b8\ub9ac \ubb38\uc81c\ub85c \ucc98\uc74c\uc5d0\ub294 \ubaa8\ub4e0 \ub178\ub4dc\ub97c dfs \ub85c \ud0d0\uc0c9\ud558\uba70 \uac00\uc7a5 height \uac00 \ub0ae\uc740 label \uc744 \uad00\ub9ac\ud558\ub294\uc2dd\uc73c\ub85c \uc811\uadfc\ud588\uc2b5\ub2c8\ub2e4. \ub2f9\uc5f0\ud788 Time out \uc774 \ubc1c\uc0dd\ud588\uace0\uc694.. O( N&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3],"tags":[81],"aioseo_notices":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/posts\/806"}],"collection":[{"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/mukgee.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=806"}],"version-history":[{"count":4,"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/posts\/806\/revisions"}],"predecessor-version":[{"id":815,"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/posts\/806\/revisions\/815"}],"wp:attachment":[{"href":"http:\/\/mukgee.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=806"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/mukgee.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=806"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/mukgee.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=806"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}