1. \uc774\uc9c4 \ud0d0\uc0c9\uc774\ub780?<\/h2>\n
\n \uc774\uc9c4 \ud0d0\uc0c9(Binary Search)\uc740 \ub9e4\uc6b0 \ud6a8\uc728\uc801\uc778 \ud0d0\uc0c9 \uc54c\uace0\ub9ac\uc998\uc73c\ub85c, \uc815\ub82c\ub41c \ubc30\uc5f4\uc5d0\uc11c \ud2b9\uc815\ud55c \uac12\uc744 \ucc3e\ub294 \ub370 \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \uc774 \uc54c\uace0\ub9ac\uc998\uc740 \uc8fc\uc5b4\uc9c4 \ub9ac\uc2a4\ud2b8\ub97c \uc808\ubc18\uc73c\ub85c \ub098\ub204\uc5b4\uac00\uba70 \uc6d0\ud558\ub294 \uac12\uc744 \uac80\uc0c9\ud558\uae30 \ub54c\ubb38\uc5d0, \uc77c\ubc18\uc801\uc778 \uc21c\ucc28 \ud0d0\uc0c9(Linear Search)\ubcf4\ub2e4 \ud6e8\uc52c \ube60\ub978 \uc131\ub2a5\uc744 \ubcf4\uc785\ub2c8\ub2e4.\n <\/p>\n
\n \uc774\uc9c4 \ud0d0\uc0c9\uc758 \ud575\uc2ec \uc544\uc774\ub514\uc5b4\ub294 \ub9ac\uc2a4\ud2b8\uac00 \uc815\ub82c\ub418\uc5b4 \uc788\ub2e4\ub294 \uc810\uc744 \ud65c\uc6a9\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uc774 \uc54c\uace0\ub9ac\uc998\uc740 \ub2e4\uc74c\uacfc \uac19\uc740 \uacfc\uc815\uc744 \ud1b5\ud574 \uc791\ub3d9\ud569\ub2c8\ub2e4:\n <\/p>\n
- \n
- \ub9ac\uc2a4\ud2b8\uc758 \uc911\uac04 \uc778\ub371\uc2a4\ub97c \ucc3e\uc2b5\ub2c8\ub2e4.<\/li>\n
- \uc911\uac04 \uc694\uc18c\uac00 \ucc3e\uace0\uc790 \ud558\ub294 \uac12\uacfc \uc77c\uce58\ud558\ub294\uc9c0 \ud655\uc778\ud569\ub2c8\ub2e4.<\/li>\n
- \uc77c\uce58\ud558\uc9c0 \uc54a\ub2e4\uba74, \uc911\uac04 \uc694\uc18c\uc640 \ucc3e\uace0\uc790 \ud558\ub294 \uac12\uc744 \ube44\uad50\ud558\uc5ec \ud0d0\uc0c9 \ubc94\uc704\ub97c \uc870\uc815\ud569\ub2c8\ub2e4. \uc989, \uc911\uac04 \uc694\uc18c\ubcf4\ub2e4 \uc791\uc73c\uba74 \uc67c\ucabd \ubc18\ucabd\uc744, \ud06c\uba74 \uc624\ub978\ucabd \ubc18\ucabd\uc744 \ud0d0\uc0c9\ud569\ub2c8\ub2e4.<\/li>\n
- \ubaa9\ud45c \uac12\uc744 \ucc3e\uc744 \ub54c\uae4c\uc9c0 \uc774 \uacfc\uc815\uc744 \ubc18\ubcf5\ud569\ub2c8\ub2e4.<\/li>\n<\/ol>\n<\/section>\n
\n 2. \uc774\uc9c4 \ud0d0\uc0c9\uc758 \uc2dc\uac04\ubcf5\uc7a1\ub3c4<\/h2>\n
\n \uc774\uc9c4 \ud0d0\uc0c9 \uc54c\uace0\ub9ac\uc998\uc758 \uc2dc\uac04\ubcf5\uc7a1\ub3c4\ub294 O(log n)\uc785\ub2c8\ub2e4. \uc774\ub294 \ud0d0\uc0c9\ud560 \ubaa9\ub85d\uc758 \ud06c\uae30\uac00 n\uc77c \ub54c, \uac01 \ub2e8\uacc4\uc5d0\uc11c \ud0d0\uc0c9 \uac00\ub2a5 \uc601\uc5ed\uc744 \ubc18\uc73c\ub85c \uc904\uc774\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \uc774\ub85c \uc778\ud574 \uc774\uc9c4 \ud0d0\uc0c9\uc740 \ub9e4\uc6b0 \ud070 \ub370\uc774\ud130 \uc138\ud2b8\uc5d0\uc11c\ub3c4 \ud6a8\uc728\uc801\uc73c\ub85c \uc791\ub3d9\ud558\ub294 \uc7a5\uc810\uc774 \uc788\uc2b5\ub2c8\ub2e4.\n <\/p>\n<\/section>\n
\n 3. \ubb38\uc81c: \ud2b9\uc815 \uac12\uc758 \uc778\ub371\uc2a4 \ucc3e\uae30<\/h2>\n
\ubb38\uc81c \uc124\uba85<\/h3>\n
\n \uc815\ub82c\ub41c \uc815\uc218 \ubc30\uc5f4 arr\uc640 \uc815\uc218 target\uc774 \uc8fc\uc5b4\uc9c8 \ub54c, target\uc758 \uc778\ub371\uc2a4\ub97c \ubc18\ud658\ud558\ub294 \uc774\uc9c4 \ud0d0\uc0c9 \ud568\uc218\ub97c \uc791\uc131\ud558\uc2dc\uc624. \ub9cc\uc57d target\uc774 \uc874\uc7ac\ud558\uc9c0 \uc54a\ub294\ub2e4\uba74 -1\uc744 \ubc18\ud658\ud574\uc57c \ud569\ub2c8\ub2e4.\n <\/p>\n
\uc785\ub825<\/h3>\n
- \n
- \uccab \ubc88\uc9f8 \uc904\uc5d0 \ubc30\uc5f4\uc758 \ud06c\uae30 n\uc774 \uc8fc\uc5b4\uc9c4\ub2e4. (1 \u2264 n \u2264 10^5)<\/li>\n
- \ub450 \ubc88\uc9f8 \uc904\uc5d0 n\uac1c\uc758 \uc815\uc218\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/li>\n
- \uc138 \ubc88\uc9f8 \uc904\uc5d0 \ubaa9\ud45c \uac12 target\uc774 \uc8fc\uc5b4\uc9c4\ub2e4. (-10^9 \u2264 target \u2264 10^9)<\/li>\n<\/ul>\n
\ucd9c\ub825<\/h3>\n
\n target\uc758 \uc778\ub371\uc2a4\ub97c \ucd9c\ub825\ud558\uc2dc\uc624. -1\uc778 \uacbd\uc6b0 target\uc774 \uc874\uc7ac\ud558\uc9c0 \uc54a\uc74c\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.\n <\/p>\n<\/section>\n
\n 4. \ubb38\uc81c\uc758 \uc785\ub825 \uc608\uc2dc<\/h2>\n
\n 5\n 1 2 3 4 5\n 3\n <\/pre>\n
\ucd9c\ub825 \uc608\uc2dc<\/h3>\n
2<\/pre>\n<\/section>\n
\n 5. \ubb38\uc81c \ud574\uacb0 \uacfc\uc815<\/h2>\n
\n \uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \ud544\uc694\ud55c \ub2e8\uacc4\ub97c \uc124\uba85\ud569\ub2c8\ub2e4. \uc774\uc9c4 \ud0d0\uc0c9 \uc54c\uace0\ub9ac\uc998\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc8fc\uc5b4\uc9c4 \ubc30\uc5f4\uc5d0\uc11c target \uac12\uc744 \ucc3e\ub294 \uacfc\uc815\uc744 \ub2e8\uacc4\ubcc4\ub85c \uc9c4\ud589\ud558\uaca0\uc2b5\ub2c8\ub2e4.\n <\/p>\n
5.1 \uc54c\uace0\ub9ac\uc998\uc758 \uad6c\ud604<\/h3>\n
\n \uba3c\uc800, \uc774\uc9c4 \ud0d0\uc0c9\uc744 \uad6c\ud604\ud558\uae30 \uc704\ud55c \uae30\ubcf8\uc801\uc778 \uad6c\uc870\ub97c \uc815\uc758\ud569\ub2c8\ub2e4. \ud568\uc218\ub294 \ubc30\uc5f4\uacfc \ubaa9\ud45c \uac12\uc744 \uc778\uc790\ub85c \ubc1b\uace0, \uc778\ub371\uc2a4 \ub610\ub294 -1\uc744 \ubc18\ud658\ud558\ub3c4\ub85d \ud569\ub2c8\ub2e4. \uc774\uc81c \ucf54\ub4dc\ub97c \uc791\uc131\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.\n <\/p>\n
\n def binary_search(arr, target):\n left, right = 0, len(arr) - 1\n \n while left <= right:\n mid = (left + right) \/\/ 2\n \n if arr[mid] == target:\n return mid\n elif arr[mid] < target:\n left = mid + 1\n else:\n right = mid - 1\n return -1\n <\/pre>\n
5.2 \ucf54\ub4dc \uc124\uba85<\/h3>\n
\n \uc704\uc758 \ucf54\ub4dc\ub294 \uac04\ub2e8\ud55c \uc774\uc9c4 \ud0d0\uc0c9 \uc54c\uace0\ub9ac\uc998\uc758 \uad6c\ud604\uc785\ub2c8\ub2e4.
left<\/code>\uc640right<\/code>\ub294 \ud604\uc7ac \ud0d0\uc0c9\ud560 \ubc94\uc704\ub97c \ud45c\uc2dc\ud569\ub2c8\ub2e4. \uae30\ubcf8\uc801\uc73c\ub85cleft<\/code>\ub294 0,right<\/code>\ub294 \ubc30\uc5f4\uc758 \ub9c8\uc9c0\ub9c9 \uc778\ub371\uc2a4\uc785\ub2c8\ub2e4.\n <\/p>\n\n
while left <= right:<\/code> \ub77c\ub294 \uc870\uac74\ubb38\uc740left<\/code>\uac00right<\/code>\ubcf4\ub2e4 \uc791\uac70\ub098 \uac19\uc744 \ub3d9\uc548 \ubc18\ubcf5\ud569\ub2c8\ub2e4. \uc911\uac04 \uac12\uc744 \uacc4\uc0b0\ud558\uc5ecmid<\/code>\uc5d0 \uc800\uc7a5\ud558\uace0, \uadf8 \uac12\uc5d0 \ub530\ub77c \uc870\uac74\uc744 \uccb4\ud06c\ud558\uc5ec \ubc94\uc704\ub97c \uc904\uc774\ub294 \ubc29\uc2dd\uc73c\ub85c \uc791\ub3d9\ud569\ub2c8\ub2e4.\n <\/p>\n5.3 \uc785\ub825 \ucc98\ub9ac \ubc0f \ucd9c\ub825<\/h3>\n
\n \ub2e4\uc74c\uc73c\ub85c \uc785\ub825\uc744 \ucc98\ub9ac\ud558\uace0, \uc791\uc131\ud55c
binary_search<\/code> \ud568\uc218\ub97c \ud638\ucd9c\ud574 \uacb0\uacfc\ub97c \ucd9c\ub825\ud558\ub294 \ubd80\ubd84\uc744 \ucd94\uac00\ud558\uaca0\uc2b5\ub2c8\ub2e4.\n <\/p>\n\n n = int(input())\n arr = list(map(int, input().split()))\n target = int(input())\n \n result = binary_search(arr, target)\n print(result)\n <\/pre>\n<\/section>\n
\n 6. \ucf54\ub4dc \ucd5c\uc801\ud654<\/h2>\n
\n \uc704\uc758 \ucf54\ub4dc\ub85c\ub294 \uae30\ubcf8\uc801\uc778 \uc774\uc9c4 \ud0d0\uc0c9\uc744 \uc218\ud589\ud560 \uc218 \uc788\uc9c0\ub9cc, \ucf54\ub4dc\ub97c \uc870\uae08 \ub354 \ucd5c\uc801\ud654\ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc774 \uc788\uc2b5\ub2c8\ub2e4. \ud2b9\ud788, Python\uc5d0\uc11c\ub294 \ub9ac\uc2a4\ud2b8\uc758 \uc911\uac04 \uc778\ub371\uc2a4\ub97c \uacc4\uc0b0\ud560 \ub54c \ub354 \uac04\ud3b8\ud55c \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ucc98\ub9ac\ub97c \ub2e8\uc21c\ud654\ud558\uae30 \uc704\ud574,
mid<\/code>\uc758 \uacc4\uc0b0\uc5d0\uc11c \uac01 \uac12\ub4e4\uc744 \uc9c1\uc811 \ub354\ud558\ub294 \ub300\uc2e0 Python\uc758 \uc815\uc218 \ub098\ub217\uc148\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\uc774 \uc88b\uc2b5\ub2c8\ub2e4.\n <\/p>\n\n def binary_search_optimized(arr, target):\n left, right = 0, len(arr) - 1\n \n while left <= right:\n mid = left + (right - left) \/\/ 2\n if arr[mid] == target:\n return mid\n elif arr[mid] < target:\n left = mid + 1\n else:\n right = mid - 1\n return -1\n <\/pre>\n
\n \uc774\uc640 \uac19\uc774
mid<\/code>\ub97c \uacc4\uc0b0\ud568\uc73c\ub85c\uc368 Python\uc758 \uba54\ubaa8\ub9ac\uc5d0\uc11c \uc624\ubc84\ud50c\ub85c\uc6b0\ub97c \ubc29\uc9c0\ud560 \uc218 \uc788\ub294 \uc7a5\uc810\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc911\uac04\uac12\uc758 \uacc4\uc0b0\uc744 \ub354 \uc548\uc804\ud558\uace0 \ud6a8\uc728\uc801\uc73c\ub85c \ub9cc\ub4dc\ub294 \uac83\uc785\ub2c8\ub2e4.\n <\/p>\n<\/section>\n\n 7. \ub2e4\uc591\ud55c \ubcc0\ud615 \ubb38\uc81c<\/h2>\n
\n \uc774\uc9c4 \ud0d0\uc0c9 \uc54c\uace0\ub9ac\uc998\uc740 \ud2b9\uc815\ud55c \uac12\uc758 \uc778\ub371\uc2a4\ub97c \ucc3e\ub294 \uac83 \uc678\uc5d0\ub3c4 \ub2e4\uc591\ud55c \ubcc0\ud615 \ubb38\uc81c\uc5d0 \uc801\uc6a9\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \ubc30\uc5f4\uc5d0\uc11c \uac00\uc7a5 \uc67c\ucabd(\ud639\uc740 \uc624\ub978\ucabd) \uc778\ub371\uc2a4 \ucc3e\uae30, \ud2b9\uc815 \uc870\uac74\uc744 \ub9cc\uc871\ud558\ub294 \ucd5c\ub300(\ud639\uc740 \ucd5c\uc18c) \uac12 \ucc3e\uae30 \ub4f1\uc758 \ubb38\uc81c\uac00 \uc788\uc2b5\ub2c8\ub2e4.\n <\/p>\n
7.1 \uc608\uc2dc \ubb38\uc81c: \uccab \ubc88\uc9f8 \uc704\uce58 \ucc3e\uae30<\/h3>\n
\n \uc8fc\uc5b4\uc9c4 \uc815\uc218 \ubc30\uc5f4\uc5d0\uc11c \ud2b9\uc815 \uac12\uc758 \uccab \ubc88\uc9f8 \uc704\uce58\ub97c \ucc3e\ub294 \ubb38\uc81c\ub97c \ud574\uacb0\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc774\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \uc774\uc9c4 \ud0d0\uc0c9\uc744 \uc0ac\uc6a9\ud558\ub418, \ub9cc\uc57d \uc911\uac04 \uac12\uc774 \ubaa9\ud45c \uac12\uacfc \uac19\uc744 \uacbd\uc6b0 \uacc4\uc18d \uc67c\ucabd\uc73c\ub85c \ud0d0\uc0c9\ud569\ub2c8\ub2e4.\n <\/p>\n
\n def binary_search_first(arr, target):\n left, right = 0, len(arr) - 1\n result = -1 # \uacb0\uacfc \uc800\uc7a5 \ubcc0\uc218\n \n while left <= right:\n mid = left + (right - left) \/\/ 2\n if arr[mid] == target:\n result = mid # \ud604\uc7ac \uc778\ub371\uc2a4\ub97c \uc800\uc7a5\n right = mid - 1 # \uc67c\ucabd \ud0d0\uc0c9\n elif arr[mid] < target:\n left = mid + 1\n else:\n right = mid - 1\n return result\n <\/pre>\n<\/section>\n
\n 8. \uacb0\ub860<\/h2>\n
\n \uc774\uc9c4 \ud0d0\uc0c9\uc740 \uc815\ub82c\ub41c \ubc30\uc5f4\uc5d0\uc11c \ud2b9\uc815 \uac12\uc744 \ucc3e\ub294\ub370 \ub9e4\uc6b0 \ud6a8\uc728\uc801\uc778 \uc54c\uace0\ub9ac\uc998\uc785\ub2c8\ub2e4. \ubcf8 \uac15\uc88c\uc5d0\uc11c\ub294 \uc774\uc9c4 \ud0d0\uc0c9\uc758 \uae30\ubcf8 \uac1c\ub150, \uc2dc\uac04 \ubcf5\uc7a1\ub3c4, \uc54c\uace0\ub9ac\uc998 \uad6c\ud604, \ucd5c\uc801\ud654 \ubc0f \ubcc0\ud615 \ubb38\uc81c\uc5d0 \ub300\ud574 \uc124\uba85\ud588\uc2b5\ub2c8\ub2e4. \uc774\uc9c4 \ud0d0\uc0c9\uc744 \ud1b5\ud574 \ucf54\ub529 \ud14c\uc2a4\ud2b8\uc5d0\uc11c \uc790\uc8fc \ucd9c\uc81c\ub418\ub294 \ubb38\uc81c\ub97c \ud6a8\uacfc\uc801\uc73c\ub85c \ud574\uacb0\ud560 \uc218 \uc788\uc744 \uac83\uc785\ub2c8\ub2e4. \uc9c0\uc18d\uc801\uc73c\ub85c \ub2e4\uc591\ud55c \ubb38\uc81c\ub97c \ubb38\uc81c\ub97c \ud480\uc5b4\ubcf4\uba70, \uc774\uc9c4 \ud0d0\uc0c9\uc744 \ud65c\uc6a9\ud55c \uae30\ubc95\ub4e4\uc744 \uc775\ud788\ub3c4\ub85d \ud558\uc138\uc694. \uc774\ub97c \ud1b5\ud574 \ub354 \ub098\uc740 \ucf54\ub529 \uc2e4\ub825\uc744 \uc313\uc744 \uc218 \uc788\uc744 \uac83\uc785\ub2c8\ub2e4.\n <\/p>\n
\n \uc55e\uc73c\ub85c\ub3c4 \ub354 \ub9ce\uc740 \uac15\uc88c\uc640 \ubb38\uc81c \ud480\uc774\ub97c \ud1b5\ud574 \ub2e4\uc591\ud55c \uc54c\uace0\ub9ac\uc998\uc744 \ubc30\uc6b0\uc2dc\uae38 \ubc14\ub78d\ub2c8\ub2e4. \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub294 \ubc18\ubcf5\uc801\uc778 \uc5f0\uc2b5\uc744 \ud1b5\ud574 \uc2e4\ub825\uc744 \ud5a5\uc0c1\uc2dc\ud0ac \uc218 \uc788\uc73c\ub2c8, \uafb8\uc900\ud788 \ub3c4\uc804\ud558\ub294 \uc790\uc138\ub97c \uac00\uc9c0\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4.\n <\/p>\n<\/section>\n<\/article>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"