\ud035 \uc815\ub82c(Quick Sort)\uc740 \ub9e4\uc6b0 \ud6a8\uc728\uc801\uc778 \uc815\ub82c \uc54c\uace0\ub9ac\uc998\uc73c\ub85c, \ud2b9\ud788 \ud3c9\uade0\uc801\uc778 \uacbd\uc6b0\uc5d0 O(n log n)\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub97c \uac00\uc9c0\uba70, \uacf5\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(log n)\uc785\ub2c8\ub2e4. \uc774 \uae00\uc5d0\uc11c\ub294 \ud035 \uc815\ub82c\uc758 \uac1c\ub150, \ucf54\ud2c0\ub9b0 \uad6c\ud604 \ubc29\ubc95, \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c, \ubb38\uc81c \ud574\uacb0 \uacfc\uc815 \ub4f1\uc744 \uc790\uc138\ud788 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
\ud035 \uc815\ub82c\uc740 \ubd84\ud560 \uc815\ubcf5 \uc54c\uace0\ub9ac\uc998\uc758 \ud558\ub098\ub85c, \ub2e4\uc74c\uacfc \uac19\uc740 \ub2e8\uacc4\ub85c \ub3d9\uc791\ud569\ub2c8\ub2e4:<\/p>\n
\uc774 \uacfc\uc815\uc740 \ubc30\uc5f4\uc774 \ub354 \uc774\uc0c1 \ub098\ub20c \uc218 \uc5c6\uc744 \ub54c\uae4c\uc9c0 \ubc18\ubcf5\ub429\ub2c8\ub2e4. \ud035 \uc815\ub82c\uc758 \uac00\uc7a5 \ud070 \uc7a5\uc810\uc740 \ud3c9\uade0\uc801\uc73c\ub85c \ub9e4\uc6b0 \ube60\ub974\uba70, in-place \uc815\ub82c \uc54c\uace0\ub9ac\uc998\uc774\ub77c\ub294 \uac83\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c \ucd94\uac00\uc801\uc778 \uba54\ubaa8\ub9ac \uc0ac\uc6a9\ub7c9\uc774 \uc801\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc815\ub82c\ud560 \ubc30\uc5f4\uc774 \uc774\uc81c, \ud035 \uc815\ub82c\uc744 \ud65c\uc6a9\ud558\uc5ec \uc815\ub82c\ub41c \ubc30\uc5f4\uc744 \ubc18\ud658\ud558\ub294 \ubb38\uc81c\ub97c \ud574\uacb0\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n \uc785\ub825: \ucd9c\ub825: \uc544\ub798\ub294 \uc704 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud55c \ucf54\ud2c0\ub9b0 \ucf54\ub4dc\uc785\ub2c8\ub2e4.<\/p>\n \ud035 \uc815\ub82c\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n \uacf5\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(log n)\uc785\ub2c8\ub2e4. \uc7ac\uadc0 \ud638\ucd9c\ub85c \uc778\ud55c \uc2a4\ud0dd \uba54\ubaa8\ub9ac \uc0ac\uc6a9 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/p>\n \uc774 \uae00\uc5d0\uc11c\ub294 \ucf54\ud2c0\ub9b0\uc73c\ub85c \ud035 \uc815\ub82c \uc54c\uace0\ub9ac\uc998\uc744 \uad6c\ud604\ud558\ub294 \ubc29\ubc95\uc744 \uc0b4\ud3b4\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \ud035 \uc815\ub82c\uc740 \uadf8 \ud6a8\uc728\uc131\uacfc \uac04\uacb0\ud568 \ub355\ubd84\uc5d0 \ub9ce\uc740 \uc0c1\ud669\uc5d0\uc11c \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \ucf54\ub529 \ud14c\uc2a4\ud2b8\uc640 \uac19\uc740 \uc0c1\ud669\uc5d0\uc11c\ub3c4 \uc790\uc8fc \ub4f1\uc7a5\ud558\ub294 \ubb38\uc81c\uc774\ubbc0\ub85c, \uae30\ubcf8\uc801\uc778 \uc774\ud574\uc640 \uc5f0\uc2b5\uc740 \ub9e4\uc6b0 \uc911\uc694\ud569\ub2c8\ub2e4.<\/p>\n \uc544\ub798\ub294 \ud035 \uc815\ub82c\uc744 \uc751\uc6a9\ud560 \uc218 \uc788\ub294 \uba87 \uac00\uc9c0 \ucd94\uac00 \uc5f0\uc2b5 \ubb38\uc81c\uc785\ub2c8\ub2e4:<\/p>\n \ud035 \uc815\ub82c\uc740 \uc54c\uace0\ub9ac\uc998\uacfc \ub370\uc774\ud130 \uad6c\uc870\uc758 \uc5ec\ub7ec \uc911\uc694\ud55c \uac1c\ub150\uc744 \ubc30\uc6b8 \uc218 \uc788\ub294 \uc88b\uc740 \ubc29\ubc95\uc785\ub2c8\ub2e4. \uacc4\uc18d\ud574\uc11c \uc5f0\uc2b5\ud558\uace0, \uc774\ud574\ub97c \uae4a\uc774 \uc788\ub294 \uc9c0\uc2dd\uc73c\ub85c \ud655\uc7a5\ud558\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n <\/body><\/p>\n","protected":false},"excerpt":{"rendered":"[3, 6, 8, 10, 1, 2, 1]<\/code>\uc774\ub77c\uace0 \uac00\uc815\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \ud035 \uc815\ub82c\uc758 \ub2e8\uacc4\ubcc4 \uacfc\uc815\uc785\ub2c8\ub2e4.<\/p>\nStep 1: \ud53c\ubc97 \uc120\ud0dd<\/h3>\n
\ud53c\ubc97: 1<\/code><\/pre>\nStep 2: \ubc30\uc5f4 \ubd84\ud560<\/h3>\n
[1, 2, 1, 10, 6, 8, 3]<\/code><\/pre>\nStep 3: \uc7ac\uadc0 \ud638\ucd9c<\/h3>\n
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[1, 1]<\/code>\uc740 \uc774\ubbf8 \uc815\ub82c\ub428.<\/li>\n[10, 6, 8, 3]<\/code>\uc5d0 \ub300\ud574 \ub2e4\uc2dc \ud035 \uc815\ub82c\uc744 \uc801\uc6a9.<\/li>\n<\/ul>\nStep 4: \ucd5c\uc885 \uc815\ub82c<\/h3>\n
[1, 1, 2, 3, 6, 8, 10]<\/code><\/pre>\n3. \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c<\/h2>\n
\ubb38\uc81c: \uc8fc\uc5b4\uc9c4 \uc815\uc218 \ubc30\uc5f4\uc744 \ud035 \uc815\ub82c\uc744 \uc0ac\uc6a9\ud574 \uc815\ub82c\ud558\ub77c.<\/h3>\n
[10, 7, 8, 9, 1, 5]<\/code><\/p>\n[1, 5, 7, 8, 9, 10]<\/code><\/p>\n4. \ucf54\ud2c0\ub9b0 \uad6c\ud604<\/h2>\n
\nfun quickSort(arr: IntArray, low: Int, high: Int) {\n if (low < high) {\n val pi = partition(arr, low, high)\n quickSort(arr, low, pi - 1)\n quickSort(arr, pi + 1, high)\n }\n}\n\nfun partition(arr: IntArray, low: Int, high: Int): Int {\n val pivot = arr[high]\n var i = (low - 1)\n\n for (j in low until high) {\n if (arr[j] <= pivot) {\n i++\n val temp = arr[i]\n arr[i] = arr[j]\n arr[j] = temp\n }\n }\n\n val temp = arr[i + 1]\n arr[i + 1] = arr[high]\n arr[high] = temp\n return i + 1\n}\n\nfun main() {\n val arr = intArrayOf(10, 7, 8, 9, 1, 5)\n quickSort(arr, 0, arr.size - 1)\n println(\"\uc815\ub82c\ub41c \ubc30\uc5f4: ${arr.joinToString(\", \")}\")\n}\n<\/code><\/pre>\n5. \ucf54\ub4dc \uc124\uba85<\/h2>\n
5.1 quickSort \ud568\uc218<\/h3>\n
quickSort<\/code> \ud568\uc218\ub294 \uc7ac\uadc0\uc801\uc73c\ub85c \ud638\ucd9c\ub418\uba70, \ubc30\uc5f4\uc758 \uc2dc\uc791 \uc778\ub371\uc2a4\uc640 \ub05d \uc778\ub371\uc2a4\ub97c \uc778\uc790\ub85c \ubc1b\uc2b5\ub2c8\ub2e4. \ub9cc\uc57d \uc2dc\uc791 \uc778\ub371\uc2a4\uac00 \ub05d \uc778\ub371\uc2a4\ubcf4\ub2e4 \uc791\uc740 \uacbd\uc6b0, partition<\/code> \ud568\uc218\ub97c \ud638\ucd9c\ud558\uc5ec \ud53c\ubc97\uc758 \uc704\uce58\ub97c \ucc3e\uace0, \uc774\ub97c \uae30\uc900\uc73c\ub85c \ubc30\uc5f4\uc744 \ub2e4\uc2dc \uc815\ub82c\ud569\ub2c8\ub2e4.<\/p>\n5.2 partition \ud568\uc218<\/h3>\n
partition<\/code> \ud568\uc218\ub294 \ubc30\uc5f4\uc744 \ud53c\ubc97\uc744 \uae30\uc900\uc73c\ub85c \ubd84\ud560\ud558\ub294 \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4. \ubaa8\ub4e0 \uc6d0\uc18c\ub97c \ud655\uc778\ud558\uba70, \ud53c\ubc97\ubcf4\ub2e4 \uc791\uc740 \uc6d0\uc18c\ub97c \uc67c\ucabd \ubc30\uc5f4\ub85c \uc774\ub3d9\uc2dc\ud0b5\ub2c8\ub2e4. \ub9c8\uc9c0\ub9c9\uc73c\ub85c \ud53c\ubc97\uc744 \uc62c\ubc14\ub978 \uc704\uce58\uc5d0 \ubc30\uce58\ud558\uace0 \uadf8 \uc778\ub371\uc2a4\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4.<\/p>\n6. \ubcf5\uc7a1\ub3c4 \ubd84\uc11d<\/h2>\n
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7. \uacb0\ub860<\/h2>\n
8. \ucd94\uac00 \uc5f0\uc2b5 \ubb38\uc81c<\/h3>\n
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