\n \uc774\ubc88 \uac15\uc88c\uc5d0\uc11c\ub294 C#\uc744 \ud65c\uc6a9\ud55c \ucf54\ub529\ud14c\uc2a4\ud2b8 \ubb38\uc81c\ub97c \ub2e4\ub8e8\uc5b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.
\n \uc8fc\uc81c\ub294 “\uc8fc\uc5b4\uc9c4 \ubc94\uc704 \ub0b4\uc758 \uc18c\uc218\uc640 \ud330\ub9b0\ub4dc\ub86c \uc218 \uc911\uc5d0\uc11c \ucd5c\uc19f\uac12 \ucc3e\uae30”\uc785\ub2c8\ub2e4.
\n \uc774 \ubb38\uc81c\ub294 \uc54c\uace0\ub9ac\uc998 \uc0ac\uace0\ub97c \uc911\uc2dc\ud558\uba70, \ud6a8\uc728\uc801\uc778 \ucf54\ub4dc\ub97c \uc791\uc131\ud558\uae30 \uc704\ud574
\n \ub2e4\uc591\ud55c \uc811\uadfc \ubc29\uc2dd\uc744 \ubc30\uc6b8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\n <\/p>\n
\n \uc8fc\uc5b4\uc9c4 \uc815\uc218 \n – \uc815\uc218 \n – \uc18c\uc218\uc774\uba74\uc11c \ud330\ub9b0\ub4dc\ub86c \uc218 \uc911\uc5d0\uc11c \ucd5c\uc19f\uac12\uc744 \ucd9c\ub825\ud558\uc138\uc694. \n \uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ub2e8\uacc4\ub85c \uc811\uadfc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n \n \uc544\ub798\ub294 C#\uc744 \uc0ac\uc6a9\ud558\uc5ec \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \ucf54\ub4dc\uc785\ub2c8\ub2e4.\n <\/p>\n \n 1. Main \uba54\uc11c\ub4dc:<\/strong> \uc785\ub825\ubc1b\uc740 \uc815\uc218 \n 2. IsPrime \uba54\uc11c\ub4dc:<\/strong> \uc8fc\uc5b4\uc9c4 \uc218\uac00 \uc18c\uc218\uc778\uc9c0 \ud310\ub2e8\ud569\ub2c8\ub2e4. \n 3. IsPalindrome \uba54\uc11c\ub4dc:<\/strong> \uc8fc\uc5b4\uc9c4 \uc218\ub97c \ubb38\uc790\uc5f4\ub85c \ubcc0\ud658 \ud6c4, \n \uc774 \uc54c\uace0\ub9ac\uc998\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(N\u221aN)\uc785\ub2c8\ub2e4. \n \uc774\ubc88 \uac15\uc88c\uc5d0\uc11c \ub2e4\ub8ec \ubb38\uc81c\ub97c \ud1b5\ud574 \uc18c\uc218\ub97c \ud310\ubcc4\ud558\uace0 \ud330\ub9b0\ub4dc\ub86c\uc744 \ud655\uc778\ud558\ub294 \ubc29\ubc95\uc744 \uc775\ud614\uc2b5\ub2c8\ub2e4. <\/body><\/p>\n","protected":false},"excerpt":{"rendered":"N<\/code>\uc5d0 \ub300\ud574,
\n 1\ubd80\ud130 N<\/code>\uae4c\uc9c0\uc758 \uc815\uc218 \uc911\uc5d0\uc11c \uc18c\uc218\uc774\uba74\uc11c
\n \ud330\ub9b0\ub4dc\ub86c\uc778 \uc218\ub97c \ubaa8\ub450 \ucc3e\uc544 \uadf8 \uc911 \ucd5c\uc19f\uac12\uc744 \uad6c\ud558\ub294 \ubb38\uc81c\uc785\ub2c8\ub2e4.
\n \uc18c\uc218\ub780 1\uacfc \uc790\uae30 \uc790\uc2e0 \uc678\uc5d0 \ub2e4\ub978 \uc57d\uc218\ub97c \uac00\uc9c0\uc9c0 \uc54a\ub294 \uc591\uc758 \uc815\uc218\ub97c \ub9d0\ud558\uba70,
\n \ud330\ub9b0\ub4dc\ub86c \uc218\ub780 \uc55e\uc5d0\uc11c \uc77d\uc73c\ub098 \ub4a4\uc5d0\uc11c \uc77d\uc73c\ub098 \uac19\uc740 \uc218\ub97c \ub9d0\ud569\ub2c8\ub2e4.\n <\/p>\n\uc785\ub825<\/h3>\n
N<\/code> (1 \u2264 N<\/code> \u2264 1,000,000)\n <\/p>\n\ucd9c\ub825<\/h3>\n
\n – \ub2e8, \uadf8\ub7ec\ud55c \uc218\uac00 \uc5c6\uc744 \uacbd\uc6b0 -1<\/code>\uc744 \ucd9c\ub825\ud574\uc57c \ud569\ub2c8\ub2e4.\n <\/p>\n\uc608\uc81c \uc785\ub825<\/h4>\n
31<\/code><\/p>\n\uc608\uc81c \ucd9c\ub825<\/h4>\n
11<\/code>\n<\/div>\n\uc54c\uace0\ub9ac\uc998 \ubd84\uc11d<\/h2>\n
\n
C# \ucf54\ub4dc \uad6c\ud604<\/h2>\n
\nusing System;\nusing System.Collections.Generic;\n\nclass Program\n{\n static void Main()\n {\n int N = int.Parse(Console.ReadLine());\n int minPrimePalindrome = int.MaxValue;\n\n for (int i = 2; i <= N; i++)\n {\n if (IsPrime(i) && IsPalindrome(i))\n {\n minPrimePalindrome = Math.Min(minPrimePalindrome, i);\n }\n }\n\n Console.WriteLine(minPrimePalindrome == int.MaxValue ? -1 : minPrimePalindrome);\n }\n\n static bool IsPrime(int number)\n {\n if (number < 2) return false;\n for (int i = 2; i <= Math.Sqrt(number); i++)\n {\n if (number % i == 0) return false;\n }\n return true;\n }\n\n static bool IsPalindrome(int number)\n {\n string str = number.ToString();\n int len = str.Length;\n for (int i = 0; i < len \/ 2; i++)\n {\n if (str[i] != str[len - 1 - i]) return false;\n }\n return true;\n }\n}\n <\/code><\/pre>\n\ucf54\ub4dc \uc124\uba85<\/h2>\n
N<\/code>\uc5d0 \ub300\ud574 2\ubd80\ud130 N<\/code>\uae4c\uc9c0\uc758 \uc218\ub97c \ubc18\ubcf5\ud569\ub2c8\ub2e4.
\n \uac01 \uc218\uac00 \uc18c\uc218\uc774\uba74\uc11c \ud330\ub9b0\ub4dc\ub86c\uc778\uc9c0 \ud655\uc778\ud558\uace0, \uadf8 \uc911 \ucd5c\uc19f\uac12\uc744 \ucc3e\uc2b5\ub2c8\ub2e4.\n <\/p>\n
\n 2\ubcf4\ub2e4 \uc791\uc740 \uacbd\uc6b0\ub294 \uc18c\uc218\uac00 \uc544\ub2c8\ubbc0\ub85c false\ub97c \ubc18\ud658\ud558\uace0,
\n 2\ubd80\ud130 \u221anumber\uae4c\uc9c0 \ub098\ub204\uc5b4 \ub5a8\uc5b4\uc9c0\ub294 \uc218\uac00 \uc788\ub294\uc9c0\ub97c \uac80\uc0ac\ud558\uc5ec \uc18c\uc218 \uc5ec\ubd80\ub97c \uacb0\uc815\ud569\ub2c8\ub2e4.\n <\/p>\n
\n \uc55e\uacfc \ub4a4\uc5d0\uc11c\ubd80\ud130 \ube44\uad50\ud558\uc5ec \ud330\ub9b0\ub4dc\ub86c \uc5ec\ubd80\ub97c \ud655\uc778\ud569\ub2c8\ub2e4.
\n \ubaa8\ub4e0 \ubb38\uc790\uac00 \uc77c\uce58\ud558\uba74 true\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4.\n <\/p>\n\uc2dc\uac04 \ubcf5\uc7a1\ub3c4<\/h2>\n
\n N\uae4c\uc9c0\uc758 \uc218\ub97c \uac80\uc0ac\ud560 \ub54c, \uac01 \uc218\uc5d0 \ub300\ud574 \uc18c\uc218 \ud310\ubcc4\uc5d0 O(\u221aN)\uc758 \uc2dc\uac04\uc774 \uc18c\uc694\ub418\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.
\n \ub530\ub77c\uc11c \uc785\ub825\uc758 \ubc94\uc704\uac00 \ucee4\uc9c8\uc218\ub85d \uc5f0\uc0b0 \uc2dc\uac04\uc774 \uc601\ud5a5\uc744 \ubc1b\uc73c\ubbc0\ub85c,
\n \uc774\uc810\uc5d0 \uc720\uc758\ud558\uc5ec \ucf54\ub4dc\ub97c \uc791\uc131\ud574\uc57c \ud569\ub2c8\ub2e4.\n <\/p>\n\uacb0\ub860<\/h2>\n
\n \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \ub370 \uc788\uc5b4 \uc18c\uc218\uc640 \ud330\ub9b0\ub4dc\ub86c\uc5d0 \ub300\ud55c \uc774\ud574\ub294
\n \ucf54\ub529\ud14c\uc2a4\ud2b8\uc5d0\uc11c \uc790\uc8fc \ub098\uc624\ub294 \uc8fc\uc81c\uc774\ubbc0\ub85c, \uc798 \uc5f0\uc2b5\ud574 \ub450\uc2dc\uae30\ub97c \ubc14\ub78d\ub2c8\ub2e4.
\n \ucd94\uac00\uc801\uc73c\ub85c \ub2e4\uc591\ud55c \uc5f0\uc2b5 \ubb38\uc81c\ub97c \ud1b5\ud574 \uc2e4\ub825\uc744 \uc313\uc544\uac00\uc2dc\ub294 \uac83\uc744 \ucd94\ucc9c\ub4dc\ub9bd\ub2c8\ub2e4.\n <\/p>\n