{"id":28244,"date":"2024-10-27T15:32:55","date_gmt":"2024-10-27T15:32:55","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=28244"},"modified":"2024-11-26T07:05:45","modified_gmt":"2024-11-26T07:05:45","slug":"%ec%8a%a4%ec%9c%84%ed%94%84%ed%8a%b8-%ec%bd%94%eb%94%a9%ed%85%8c%ec%8a%a4%ed%8a%b8-%ea%b0%95%ec%a2%8c-%ec%98%a4%ec%9d%bc%eb%9f%ac-%ed%94%bc","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/28244\/","title":{"rendered":"\uc2a4\uc704\ud504\ud2b8 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc624\uc77c\ub7ec \ud53c"},"content":{"rendered":"<article>\n<p>\n        \uc2a4\uc704\ud504\ud2b8(Swift) \ucf54\ub529\ud14c\uc2a4\ud2b8 \uc900\ube44\ub97c \uc704\ud55c \uac15\uc88c\ub85c, \uc6b0\ub9ac\ub294 \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub97c \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4. \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub294 \uc815\uc218\uc758 \uace0\uc720\ud55c \uc131\uc9c8\uc744 \uc774\ud574\ud558\ub294 \ub370 \ub9e4\uc6b0 \uc911\uc694\ud55c \uac1c\ub150\uc73c\ub85c, \uc218\ub860 \ubc0f \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\uc5d0\uc11c \uc790\uc8fc \ub4f1\uc7a5\ud569\ub2c8\ub2e4.\n    <\/p>\n<h2>\uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub780?<\/h2>\n<p>\n        \uc624\uc77c\ub7ec \ud53c \ud568\uc218 \u03c6(n)\uc740 n \uc774\ud558\uc758 \uc815\uc218 \uc911\uc5d0\uc11c n\uacfc \uc11c\ub85c\uc18c\uc778 \uc815\uc218\uc758 \uac1c\uc218\ub97c \ub098\ud0c0\ub0c5\ub2c8\ub2e4. \uc11c\ub85c\uc18c\ub780 \ub450 \uc815\uc218\uac00 1\uc744 \uc81c\uc678\ud558\uace0\ub294 \uacf5\uc57d\uc218\uac00 \uc5c6\ub294 \uacbd\uc6b0\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \u03c6(1) = 1, \u03c6(2) = 1, \u03c6(3) = 2 (1\uacfc 2\uac00 \uc11c\ub85c\uc18c)\uc785\ub2c8\ub2e4. \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub294 \ud2b9\ud788 \uc554\ud638\ud559\uacfc \uc218\ub860\uc758 \uc5ec\ub7ec \ubb38\uc81c\uc5d0\uc11c \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4.\n    <\/p>\n<h2>\ubb38\uc81c \uc124\uba85<\/h2>\n<p>\n        \uc8fc\uc5b4\uc9c4 \uc790\uc5f0\uc218 N\uc5d0 \ub300\ud574, 1\ubd80\ud130 N\uae4c\uc9c0\uc758 \ubaa8\ub4e0 \uc815\uc218 \uc911 n\uacfc \uc11c\ub85c\uc18c\uc778 \uc815\uc218\uc758 \uac1c\uc218\ub97c \uad6c\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\uc138\uc694.\n    <\/p>\n<h3>\uc785\ub825 \ud615\uc2dd<\/h3>\n<ul>\n<li>\n            \uccab \ubc88\uc9f8 \uc904\uc5d0 \uc790\uc5f0\uc218 N(1 \u2264 N \u2264 1,000,000)\uc774 \uc8fc\uc5b4\uc9d1\ub2c8\ub2e4.\n        <\/li>\n<\/ul>\n<h3>\ucd9c\ub825 \ud615\uc2dd<\/h3>\n<ul>\n<li>\n            \ub2e8\uc77c \uc815\uc218 \u03c6(N)\ub97c \ud55c \uc904\uc5d0 \ucd9c\ub825\ud569\ub2c8\ub2e4.\n        <\/li>\n<\/ul>\n<h2>\uc608\uc81c \uc785\ub825 \ubc0f \ucd9c\ub825<\/h2>\n<pre><code>\uc785\ub825:\n10\n\ucd9c\ub825:\n4\n<\/code><\/pre>\n<p>\uc704 \uc608\uc81c\uc5d0\uc11c \u03c6(10)\ub294 4\uc785\ub2c8\ub2e4. \uc774\ub294 1, 3, 7, 9\uac00 10\uacfc \uc11c\ub85c\uc18c\uc774\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/p>\n<h2>\ubb38\uc81c \ud574\uacb0 \uc811\uadfc\ubc95<\/h2>\n<p>\n        \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub97c \uacc4\uc0b0\ud558\uae30 \uc704\ud574\uc11c\ub294 \ub2e4\uc74c \ub2e8\uacc4\ub85c \uc811\uadfc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:\n    <\/p>\n<ol>\n<li>\n            \uc18c\uc218\uc758 \uac1c\ub150\uc744 \uc774\ud574\ud558\uace0, n\uc758 \ubaa8\ub4e0 \uc18c\uc218 \uc57d\uc218\ub97c \ucc3e\uc544\uc57c \ud569\ub2c8\ub2e4.\n        <\/li>\n<li>\n            n\uc774 \uc18c\uc218\uc778 \uacbd\uc6b0, \u03c6(n) = n &#8211; 1\uc784\uc744 \uc774\uc6a9\ud569\ub2c8\ub2e4.\n        <\/li>\n<li>\n            n\uc744 \uc18c\uc218\uc758 \uacf1\uc73c\ub85c \ubd84\ud574\ud558\uc5ec \u03c6(n)\uc744 \uc720\ub3c4\ud558\ub294 \uacf5\uc2dd\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4:<\/p>\n<pre><code>\u03c6(n) = n * (1 - 1\/p1) * (1 - 1\/p2) * ... * (1 - 1\/pk)<\/code><\/pre>\n<p>            \uc5ec\uae30\uc11c p1, p2, &#8230;, pk\ub294 n\uc758 \ubaa8\ub4e0 \uc18c\uc218 \uc57d\uc218\uc785\ub2c8\ub2e4.\n        <\/li>\n<\/ol>\n<h2>\uc2a4\uc704\ud504\ud2b8 \ucf54\ub4dc \uad6c\ud604<\/h2>\n<p>\n        \uc774\uc81c \uc704\uc758 \uc811\uadfc\ubc95\uc744 \ubc14\ud0d5\uc73c\ub85c \uc2a4\uc704\ud504\ud2b8\ub85c \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub97c \uad6c\ud604\ud558\uaca0\uc2b5\ub2c8\ub2e4.\n    <\/p>\n<pre><code>import Foundation\n\nfunc eulerTotientFunction(_ n: Int) -&gt; Int {\n    var result = n\n    var number = n\n    var p = 2\n\n    while p * p &lt;= number {\n        \/\/ p\uac00 number\uc758 \uc57d\uc218\uc778\uc9c0 \ud655\uc778\n        if number % p == 0 {\n            \/\/ p\uc758 \uc57d\uc218\ub97c \uc81c\uac70\n            while number % p == 0 {\n                number \/= p\n            }\n            \/\/ \uc624\uc77c\ub7ec \ud53c \ud568\uc218 \uacf5\uc2dd \uc801\uc6a9\n            result -= result \/ p\n        }\n        p += 1\n    }\n\n    \/\/ n\uc774 \uc18c\uc218\uc778 \uacbd\uc6b0\n    if number &gt; 1 {\n        result -= result \/ number\n    }\n\n    return result\n}\n\n\/\/ \uc608\uc81c \uc0ac\uc6a9\nlet n = 10\nlet result = eulerTotientFunction(n)\nprint(\"\u03c6(\\(n)) =\", result) \/\/ \ucd9c\ub825: \u03c6(10) = 4\n<\/code><\/pre>\n<h2>\ucf54\ub4dc \uc124\uba85<\/h2>\n<p>\n        \uc704 \ucf54\ub4dc\ub294 \uc2a4\uc704\ud504\ud2b8 \uc5b8\uc5b4\ub85c \uc791\uc131\ub41c \uc624\uc77c\ub7ec \ud53c \ud568\uc218\uc758 \uad6c\ud604 \uc608\uc2dc\uc785\ub2c8\ub2e4. \uc8fc\uc5b4\uc9c4 \uc790\uc5f0\uc218 n\uc5d0 \ub300\ud574, \ub2e4\uc74c \uc21c\uc11c\ub85c \uc9c4\ud589\ud569\ub2c8\ub2e4:\n    <\/p>\n<ul>\n<li>\n<strong>\ucd08\uae30\ud654:<\/strong> result\uc5d0 n\uc744 \uc800\uc7a5\ud558\uace0, number\uc5d0 n\uc744 \uc800\uc7a5\ud55c \ud6c4, p\ub97c 2\ub85c \ucd08\uae30\ud654\ud569\ub2c8\ub2e4.\n        <\/li>\n<li>\n<strong>\uc57d\uc218 \ucc3e\uae30:<\/strong> p\uac00 number\uc758 \uc81c\uacf1\ubcf4\ub2e4 \uc791\uac70\ub098 \uac19\uc740 \ub3d9\uc548 \ubc18\ubcf5\ud569\ub2c8\ub2e4. \ub9cc\uc57d p\uac00 number\uc758 \uc57d\uc218\ub77c\uba74, number\ub97c p\ub85c \ub098\ub204\uc5b4 \ud574\ub2f9 \uc57d\uc218\ub97c \ubaa8\ub450 \uc81c\uac70\ud569\ub2c8\ub2e4. \uadf8 \ud6c4, result\uc5d0\uc11c p\ub85c \ub098\ub204\uace0 \uacb0\uacfc\ub97c \ub2e4\uc2dc \uc800\uc7a5\ud569\ub2c8\ub2e4.\n        <\/li>\n<li>\n<strong>\uc18c\uc218 \ud655\uc778:<\/strong> \ub9c8\uc9c0\ub9c9\uc73c\ub85c number\uac00 1\ubcf4\ub2e4 \ud06c\ub2e4\uba74, n\uc740 \uc18c\uc218\uc774\ubbc0\ub85c, \u03c6(n) \uacf5\uc2dd\uc5d0\uc11c \ub9c8\uc9c0\ub9c9 \uc18c\uc218\uc5d0 \ub300\ud55c \ucc98\ub9ac\ub97c \uc2dc\ud589\ud569\ub2c8\ub2e4.\n        <\/li>\n<\/ul>\n<h2>\ud14c\uc2a4\ud2b8<\/h2>\n<p>\n        \uc704\uc758 \uc54c\uace0\ub9ac\uc998\uc744 \uc0ac\uc6a9\ud558\uba74 \ub2e4\uc591\ud55c \uc785\ub825\uc5d0 \ub300\ud574 \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub97c \ube60\ub974\uace0 \ud6a8\uc728\uc801\uc73c\ub85c \uacc4\uc0b0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \uba87 \uac00\uc9c0 \ub2e4\ub978 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\uc785\ub2c8\ub2e4.\n    <\/p>\n<pre><code>let testCases = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100, 1000, 10000, 100000, 1000000]\nfor case in testCases {\n    print(\"\u03c6(\\(case)) =\", eulerTotientFunction(case))\n}\n<\/code><\/pre>\n<h2>\uacb0\ub860<\/h2>\n<p>\n        \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub294 \uc218\ub860\uc5d0\uc11c \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud558\ub294 \uac1c\ub150\uc73c\ub85c, \uc2a4\uc704\ud504\ud2b8\ub97c \uc774\uc6a9\ud574 \ud6a8\uacfc\uc801\uc73c\ub85c \uad6c\ud604\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc704\uc758 \uc608\uc81c\ub97c \ud1b5\ud574 \uc624\uc77c\ub7ec \ud53c \ud568\uc218\uc758 \uc815\uc758\uc640 \uc54c\uace0\ub9ac\uc998\uc801 \uc811\uadfc\ubc95\uc744 \uc124\uba85\ud558\uc600\uc73c\uba70, \ucd94\ud6c4 \ub354 \ubcf5\uc7a1\ud55c \ubb38\uc81c\ub85c \ub098\uc544\uac00\ub294 \ub370 \ud1a0\ub300\uac00 \ub418\uae30\ub97c \ubc14\ub78d\ub2c8\ub2e4. \uc2a4\uc704\ud504\ud2b8\ub098 \ub2e4\ub978 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c \uc774 \ud568\uc218\ub97c \uad6c\ud604\ud558\uba70 \uc5f0\uc2b5\ud574\ubcf4\uc138\uc694.\n    <\/p>\n<h2>\ucd94\uac00 \uc790\ub8cc<\/h2>\n<p>\n        \uc624\uc77c\ub7ec \ud53c \ud568\uc218\uc5d0 \ub300\ud55c \ub354 \uae4a\uc774 \uc788\ub294 \uc790\ub8cc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:\n    <\/p>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Euler%27s_totient_function\">\uc704\ud0a4\ubc31\uacfc: \uc624\uc77c\ub7ec \ud53c \ud568\uc218<\/a><\/li>\n<li><a href=\"https:\/\/math.stackexchange.com\/questions\/1284791\/how-to-compute-the-euler-totient-function\">Math Stack Exchange: \uc624\uc77c\ub7ec \ud53c \ud568\uc218 \uacc4\uc0b0\ud558\uae30<\/a><\/li>\n<\/ul>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\uc2a4\uc704\ud504\ud2b8(Swift) \ucf54\ub529\ud14c\uc2a4\ud2b8 \uc900\ube44\ub97c \uc704\ud55c \uac15\uc88c\ub85c, \uc6b0\ub9ac\ub294 \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub97c \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4. \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub294 \uc815\uc218\uc758 \uace0\uc720\ud55c \uc131\uc9c8\uc744 \uc774\ud574\ud558\ub294 \ub370 \ub9e4\uc6b0 \uc911\uc694\ud55c \uac1c\ub150\uc73c\ub85c, \uc218\ub860 \ubc0f \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\uc5d0\uc11c \uc790\uc8fc \ub4f1\uc7a5\ud569\ub2c8\ub2e4. \uc624\uc77c\ub7ec \ud53c \ud568\uc218\ub780? \uc624\uc77c\ub7ec \ud53c \ud568\uc218 \u03c6(n)\uc740 n \uc774\ud558\uc758 \uc815\uc218 \uc911\uc5d0\uc11c n\uacfc \uc11c\ub85c\uc18c\uc778 \uc815\uc218\uc758 \uac1c\uc218\ub97c \ub098\ud0c0\ub0c5\ub2c8\ub2e4. \uc11c\ub85c\uc18c\ub780 \ub450 \uc815\uc218\uac00 1\uc744 \uc81c\uc678\ud558\uace0\ub294 \uacf5\uc57d\uc218\uac00 \uc5c6\ub294 \uacbd\uc6b0\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, &hellip; <a href=\"https:\/\/atmokpo.com\/w\/28244\/\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;\uc2a4\uc704\ud504\ud2b8 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc624\uc77c\ub7ec \ud53c&#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":[27],"tags":[],"class_list":["post-28244","post","type-post","status-publish","format-standard","hentry","category-27"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\uc2a4\uc704\ud504\ud2b8 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc624\uc77c\ub7ec \ud53c - \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\/28244\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" 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\ub098\ud0c0\ub0c5\ub2c8\ub2e4. \uc11c\ub85c\uc18c\ub780 \ub450 \uc815\uc218\uac00 1\uc744 \uc81c\uc678\ud558\uace0\ub294 \uacf5\uc57d\uc218\uac00 \uc5c6\ub294 \uacbd\uc6b0\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, &hellip; \ub354 \ubcf4\uae30 &quot;\uc2a4\uc704\ud504\ud2b8 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc624\uc77c\ub7ec \ud53c&quot;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/atmokpo.com\/w\/28244\/\" \/>\n<meta property=\"og:site_name\" content=\"\ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"article:published_time\" content=\"2024-10-27T15:32:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-26T07:05:45+00:00\" \/>\n<meta name=\"author\" content=\"root\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@bebubo4\" \/>\n<meta name=\"twitter:site\" content=\"@bebubo4\" \/>\n<meta name=\"twitter:label1\" content=\"\uae00\uc4f4\uc774\" 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