{"id":28278,"date":"2024-10-27T15:33:14","date_gmt":"2024-10-27T15:33:14","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=28278"},"modified":"2024-11-26T07:05:07","modified_gmt":"2024-11-26T07:05:07","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%a0%9c%ea%b3%b1%ec%9d%b4-%ec%95%84%eb%8b%8c-%ec%88%98-%ec%b0%be%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/28278\/","title":{"rendered":"\uc2a4\uc704\ud504\ud2b8 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc81c\uacf1\uc774 \uc544\ub2cc \uc218 \ucc3e\uae30"},"content":{"rendered":"

<\/p>\n

\ubb38\uc81c \uc124\uba85<\/h2>\n

\uc6b0\ub9ac\ub294 \uc8fc\uc5b4\uc9c4 \uc815\uc218 N\uc5d0 \ub300\ud574 1\ubd80\ud130 N\ubc88\uc9f8 \uc815\uc218\uae4c\uc9c0\uc758 \uc218 \uc911\uc5d0\uc11c \uc644\uc804 \uc81c\uacf1\uc218\uac00 \uc544\ub2cc \uc218\uc758 \uac1c\uc218\ub97c \ucc3e\uc73c\ub824\uace0 \ud569\ub2c8\ub2e4. \uc644\uc804 \uc81c\uacf1\uc218\ub780 \uc5b4\ub5a4 \uc815\uc218\ub97c \uc81c\uacf1\ud574\uc11c \uc5bb\uc740 \uc218\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, 1, 4, 9, 16, 25 \ub4f1\uc740 \ubaa8\ub450 \uc644\uc804 \uc81c\uacf1\uc218\uc785\ub2c8\ub2e4. \ubc18\uba74\uc5d0 2, 3, 5, 6, 7, 8, 10 \ub4f1\uc740 \uc644\uc804 \uc81c\uacf1\uc218\uac00 \uc544\ub2d9\ub2c8\ub2e4.<\/p>\n

\uc785\ub825 \ud615\uc2dd<\/h2>\n

\uccab \ubc88\uc9f8 \uc904\uc5d0\ub294 \uc815\uc218 N (1 \u2264 N \u2264 106<\/sup>)\uc774 \uc8fc\uc5b4\uc9d1\ub2c8\ub2e4.<\/p>\n

\ucd9c\ub825 \ud615\uc2dd<\/h2>\n

1\ubd80\ud130 N\uae4c\uc9c0\uc758 \uc218 \uc911\uc5d0\uc11c \uc644\uc804 \uc81c\uacf1\uc218\uac00 \uc544\ub2cc \uc218\uc758 \uac1c\uc218\ub97c \ucd9c\ub825\ud569\ub2c8\ub2e4.<\/p>\n

\uc608\uc81c \uc785\ub825<\/h2>\n
\n10<\/code>\n<\/div>\n

\uc608\uc81c \ucd9c\ub825<\/h2>\n
\n7<\/code>\n<\/div>\n

\ubb38\uc81c \ud574\uacb0 \uacfc\uc815<\/h2>\n

\uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574\uc11c\ub294 \uc804\uccb4 \uc218\uc758 \uac1c\uc218\uc5d0\uc11c \uc644\uc804 \uc81c\uacf1\uc218\uc758 \uac1c\uc218\ub97c \ube7c\uba74 \ub429\ub2c8\ub2e4. \uc774\ub97c \uc704\ud574 \ub2e4\uc74c\uacfc \uac19\uc740 \uc808\ucc28\ub97c \ub530\ub985\ub2c8\ub2e4.<\/p>\n

1\ub2e8\uacc4: \uc644\uc804 \uc81c\uacf1\uc218\uc758 \ubc94\uc704 \ud30c\uc545<\/h3>\n

\uc644\uc804 \uc81c\uacf1\uc218\ub294 1, 4, 9, 16, … \ub4f1\uc758 \ud615\ud0dc\ub85c \uc0dd\uc131\ub429\ub2c8\ub2e4. N\uc774 10\uc778 \uacbd\uc6b0, \uc644\uc804 \uc81c\uacf1\uc218\ub294 1(12<\/sup>), 4(22<\/sup>), 9(32<\/sup>)\uac00 \ub429\ub2c8\ub2e4. \uc774 \uacbd\uc6b0, \uc644\uc804 \uc81c\uacf1\uc218\ub294 \ucd1d 3\uac1c\uc785\ub2c8\ub2e4.<\/p>\n

2\ub2e8\uacc4: \uc644\uc804 \uc81c\uacf1\uc218\uc758 \uac1c\uc218 \uacc4\uc0b0<\/h3>\n

N\uc5d0 \ub300\ud574 \uc5b4\ub5a4 \uc815\uc218 k\uc5d0 \ub300\ud574 k2<\/sup> <= N\uc744 \ub9cc\uc871\ud558\ub294 \ucd5c\ub300\uc758 k\ub97c \ucc3e\uc73c\uba74 \ub429\ub2c8\ub2e4. \uc774 k\ub294 \u221aN<\/code>\uc758 \uc815\uc218 \ubd80\ubd84\uc73c\ub85c \uacc4\uc0b0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

3\ub2e8\uacc4: \uacb0\uacfc \ub3c4\ucd9c<\/h3>\n

\uc804\uccb4 \uc218\uc758 \uac1c\uc218\ub294 N\uc774\uba70, \uc644\uc804 \uc81c\uacf1\uc218\uc758 \uac1c\uc218\ub294 k\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c \uc81c\uacf1\uc774 \uc544\ub2cc \uc218\uc758 \uac1c\uc218\ub294 N - k<\/code>\ub85c \uacc4\uc0b0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

\uad6c\ud604 \ucf54\ub4dc (Swift)<\/h2>\n
func countNonPerfectSquares(N: Int) -> Int {\n        \/\/ 1\ubd80\ud130 N\uae4c\uc9c0\uc758 \uc218\uc5d0\uc11c \uc644\uc804 \uc81c\uacf1\uc218\ub97c \ucc3e\uae30 \uc704\ud574 k\ub97c \uad6c\ud569\ub2c8\ub2e4.\n        let k = Int(sqrt(Double(N)))\n        \n        \/\/ \uc644\uc804 \uc81c\uacf1\uc218\uac00 \uc544\ub2cc \uc218\uc758 \uac1c\uc218\ub97c \uad6c\ud569\ub2c8\ub2e4.\n        return N - k\n    }\n\n\/\/ \uc608\uc2dc \uc2e4\ud589\nlet N = 10\nprint(countNonPerfectSquares(N: N)) \/\/ \uacb0\uacfc: 7\n    <\/code><\/pre>\n
\ubcf5\uc7a1\ub3c4 \ubd84\uc11d<\/h2>\n
\uc774 \uc54c\uace0\ub9ac\uc998\uc740 O(1)<\/code>\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub97c \uac00\uc9d1\ub2c8\ub2e4. \uc8fc\uc5b4\uc9c4 N\uc5d0 \ub300\ud574\uc11c \uc81c\uacf1\uadfc\uc744 \uad6c\ud558\ub294 \uc5f0\uc0b0\uc740 \uc0c1\uc218 \uc2dc\uac04\uc5d0 \uc774\ub8e8\uc5b4\uc9c0\ubbc0\ub85c \ub9e4\uc6b0 \ud6a8\uc728\uc801\uc785\ub2c8\ub2e4. \uba54\ubaa8\ub9ac \uc0ac\uc6a9 \ub610\ud55c \uc0c1\uc218\ub85c \uc81c\ud55c\ub418\uc5b4 \uc788\uc73c\ubbc0\ub85c, \uc774 \ubb38\uc81c\ub294 \ub300\uaddc\ubaa8 \uc785\ub825\uc5d0\uc11c\ub3c4 \uc548\uc815\uc801\uc73c\ub85c \uc791\ub3d9\ud569\ub2c8\ub2e4.<\/p>\n
\uc0ac\ud6c4 \ubd84\uc11d<\/h2>\n
\uc774 \ubb38\uc81c\ub97c \ud1b5\ud574 \uc6b0\ub9ac\ub294 \uc644\uc804 \uc81c\uacf1\uc218\uc5d0 \ub300\ud55c \uac1c\ub150\uacfc \ud568\uaed8 \uc81c\uacf1\uadfc \uacc4\uc0b0\uc758 \ud6a8\uc728\uc131\uc744 \uc774\ud574\ud560 \uc218 \uc788\uc5c8\uc2b5\ub2c8\ub2e4. \ub610\ud55c, \ub9e4\uc6b0 \uac04\ub2e8\ud55c \uacc4\uc0b0\uc744 \ud1b5\ud574 \ubcf5\uc7a1\ud55c \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \ubc29\ubc95\uc744 \ubc30\uc6e0\uc2b5\ub2c8\ub2e4.<\/p>\n
\ub9c8\ubb34\ub9ac<\/h2>\n
\uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \uacfc\uc815\uc5d0\uc11c\ub294 \ubb38\uc81c\ub97c \uc774\ud574\ud558\uace0, \ud574\uacb0\ucc45\uc744 \ub2e8\uacc4\ubcc4\ub85c \uc138\uc6b0\uba70, \ud6a8\uc728\uc801\uc73c\ub85c \uad6c\ud604\ud558\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4. \uc774\ub7ec\ud55c \uacfc\uc815\uc740 \uc5ec\ub7ec \uac00\uc9c0 \uc720\ud615\uc758 \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ub2e4\ub8e8\ub294 \ub370 \ud070 \ub3c4\uc6c0\uc774 \ub420 \uac83\uc785\ub2c8\ub2e4. \ub2e4\uc74c \uac15\uc88c\uc5d0\uc11c\ub294 \ub354\uc6b1 \ubcf5\uc7a1\ud55c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ub2e4\ub904 \ubcfc \uc608\uc815\uc785\ub2c8\ub2e4. \uac10\uc0ac\ud569\ub2c8\ub2e4!<\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
\ubb38\uc81c \uc124\uba85 \uc6b0\ub9ac\ub294 \uc8fc\uc5b4\uc9c4 \uc815\uc218 N\uc5d0 \ub300\ud574 1\ubd80\ud130 N\ubc88\uc9f8 \uc815\uc218\uae4c\uc9c0\uc758 \uc218 \uc911\uc5d0\uc11c \uc644\uc804 \uc81c\uacf1\uc218\uac00 \uc544\ub2cc \uc218\uc758 \uac1c\uc218\ub97c \ucc3e\uc73c\ub824\uace0 \ud569\ub2c8\ub2e4. \uc644\uc804 \uc81c\uacf1\uc218\ub780 \uc5b4\ub5a4 \uc815\uc218\ub97c \uc81c\uacf1\ud574\uc11c \uc5bb\uc740 \uc218\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, 1, 4, 9, 16, 25 \ub4f1\uc740 \ubaa8\ub450 \uc644\uc804 \uc81c\uacf1\uc218\uc785\ub2c8\ub2e4. \ubc18\uba74\uc5d0 2, 3, 5, 6, 7, 8, 10 \ub4f1\uc740 \uc644\uc804 \uc81c\uacf1\uc218\uac00 \uc544\ub2d9\ub2c8\ub2e4. \uc785\ub825 \ud615\uc2dd \uccab \ubc88\uc9f8 \uc904\uc5d0\ub294 … \ub354 \ubcf4\uae30 “\uc2a4\uc704\ud504\ud2b8 \ucf54\ub529\ud14c\uc2a4\ud2b8 \uac15\uc88c, \uc81c\uacf1\uc774 \uc544\ub2cc \uc218 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