\ucf54\ub529\ud14c\uc2a4\ud2b8\ub294 \ud604\ub300 \uc18c\ud504\ud2b8\uc6e8\uc5b4 \uac1c\ubc1c\uc5d0\uc11c \ud544\uc218\uc801\uc778 \ubd80\ubd84 \uc911 \ud558\ub098\uc785\ub2c8\ub2e4. \ud2b9\ud788 \uc790\ubc14\uc640 \uac19\uc740 \uac1d\uccb4\uc9c0\ud5a5 \uc5b8\uc5b4\uc5d0\uc11c\uc758 \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c \ud574\uacb0 \ub2a5\ub825\uc744 \ud0a4\uc6b0\ub294 \uac83\uc740 \ub9e4\uc6b0 \uc911\uc694\ud569\ub2c8\ub2e4. \uc774\ubc88 \uac15\uc88c\uc5d0\uc11c\ub294 ‘\uc81c\uacf1\uc774 \uc544\ub2cc \uc218 \ucc3e\uae30’\ub77c\ub294 \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ub2e4\ub904\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc774 \ubb38\uc81c\ub294 \uc815\uc218 \ubc30\uc5f4\uc5d0\uc11c \uc81c\uacf1\uc218\ub4e4\uc744 \uc81c\uc678\ud55c \ub098\uba38\uc9c0 \uc218\ub4e4\uc744 \ucc3e\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n
\uc8fc\uc5b4\uc9c4 \uc815\uc218 \ubc30\uc5f4\uc5d0\uc11c \uc81c\uacf1\uc218\uac00 \uc544\ub2cc \uc218\ub97c \ucc3e\ub294 \ubb38\uc81c\uc785\ub2c8\ub2e4. \uc81c\uacf1\uc218\ub780 \uc5b4\ub5a4 \uc815\uc218\ub97c \uc81c\uacf1\ud588\uc744 \ub54c \ub098\uc624\ub294 \uc218\ub97c \ub9d0\ud558\uba70, \uc608\ub97c \ub4e4\uc5b4 \uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \uc6b0\ub9ac\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ub2e8\uacc4\ub97c \uac70\uce69\ub2c8\ub2e4:<\/p>\n \uc218 \uc774\uc81c \uc6b0\ub9ac\ub294 \uc774 \uc54c\uace0\ub9ac\uc998\uc744 \uc790\ubc14\ub85c \uad6c\ud604\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n \uc704\uc758 \ucf54\ub4dc\uc5d0\uc11c\ub294 \uc2e4\uc81c\ub85c \uc774 \ucf54\ub4dc\ub97c \uc2e4\ud589\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc704\uc758 \uc785\ub825 \ubc30\uc5f4 \uc774 \uc54c\uace0\ub9ac\uc998\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 \uc774\ubc88 \uac15\uc88c\uc5d0\uc11c\ub294 \uc81c\uacf1\uc774 \uc544\ub2cc \uc218\ub97c \ucc3e\ub294 \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ub2e4\ub904\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \uc774 \ubb38\uc81c\ub97c \ud1b5\ud574 \ubc30\uc5f4\uc744 \uc21c\ud68c\ud558\uba70 \uc870\uac74\uc5d0 \ub530\ub77c \uac12\uc744 \ucd94\uac00\ud558\ub294 \uae30\ubcf8\uc801\uc778 \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c \ud574\uacb0 \ubc29\ubc95\uc744 \ubc30\uc6b8 \uc218 \uc788\uc5c8\uc2b5\ub2c8\ub2e4. \uc55e\uc73c\ub85c \ubc18\ubcf5\uc801\uc73c\ub85c \ucd9c\uc81c\ub418\ub294 \uc218\ub9ce\uc740 \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub4e4\uc5d0 \ub300\ud55c \uc900\ube44\ub97c \uc704\ud574 \uc774\ub7ec\ud55c \ubb38\uc81c\ub4e4\uc744 \uafb8\uc900\ud788 \ud480\uc5b4\ubcf4\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4.<\/p>\n \ub2e4\uc74c \uac15\uc88c\uc5d0\uc11c\ub294 \ub354 \ubcf5\uc7a1\ud55c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ub2e4\ub8e8\uc5b4 \ubcf4\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4. \uac10\uc0ac\ud569\ub2c8\ub2e4!<\/p>\n <\/body><\/p>\n","protected":false},"excerpt":{"rendered":"0, 1, 4, 9, 16, ...<\/code> \ub4f1\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\uc785\ub825<\/h3>\n
\n
\ucd9c\ub825<\/h3>\n
\n
\ubb38\uc81c \ud574\uacb0 \uc804\ub7b5<\/h2>\n
\n
\uc81c\uacf1\uc218 \uc5ec\ubd80 \ud655\uc778 \ubc29\ubc95<\/h3>\n
x<\/code>\uac00 \uc81c\uacf1\uc218\uc778\uc9c0 \ud655\uc778\ud558\ub294 \ubc29\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4. \uba3c\uc800 x<\/code>\uc758 \uc81c\uacf1\uadfc\uc744 \uacc4\uc0b0\ud55c \ud6c4, \uadf8 \uc81c\uacf1\uadfc\uc744 \uc815\uc218\ub85c \ubcc0\ud658\ud558\uc5ec \ub2e4\uc2dc \uc81c\uacf1\ud574\ubcf4\ub294 \uac83\uc785\ub2c8\ub2e4. \ub9cc\uc57d x<\/code>\uc640 \uc77c\uce58\ud558\uba74 x<\/code>\ub294 \uc81c\uacf1\uc218\uc785\ub2c8\ub2e4.<\/p>\nboolean isPerfectSquare(int x) {\n if (x < 0) return false;\n int s = (int) Math.sqrt(x);\n return s * s == x;\n}<\/code><\/pre>\n\uc790\ubc14 \uad6c\ud604<\/h2>\n
import java.util.ArrayList;\nimport java.util.List;\n\npublic class FindNonPerfectSquares {\n \n public static List<Integer> findNonPerfectSquares(int[] arr) {\n List<Integer> result = new ArrayList<>();\n\n for (int num : arr) {\n if (!isPerfectSquare(num)) {\n result.add(num);\n }\n }\n \n return result;\n }\n \n private static boolean isPerfectSquare(int x) {\n if (x < 0) return false;\n int s = (int) Math.sqrt(x);\n return s * s == x;\n }\n\n public static void main(String[] args) {\n int[] inputArray = {1, 2, 3, 4, 5, 9, 10, 15, 16, 20};\n List<Integer> nonPerfectSquares = findNonPerfectSquares(inputArray);\n System.out.println(\"\uc81c\uacf1\uc774 \uc544\ub2cc \uc218\ub4e4: \" + nonPerfectSquares);\n }\n}<\/code><\/pre>\n\ucf54\ub4dc \uc124\uba85<\/h2>\n
findNonPerfectSquares<\/code>\ub77c\ub294 \uba54\uc11c\ub4dc\ub97c \ud1b5\ud574 \uc8fc\uc5b4\uc9c4 \ubc30\uc5f4\uc744 \uc21c\ud68c\ud569\ub2c8\ub2e4. \uac01 \uc22b\uc790\uc5d0 \ub300\ud574 isPerfectSquare<\/code> \uba54\uc11c\ub4dc\ub97c \ud638\ucd9c\ud558\uc5ec \uc81c\uacf1\uc218\uc778 \uacbd\uc6b0\ub294 \uc9c0\ub098\uce58\uace0, \uc81c\uacf1\uc218\uac00 \uc544\ub2cc \uacbd\uc6b0\ub9cc \uacb0\uacfc \ub9ac\uc2a4\ud2b8\uc5d0 \ucd94\uac00\ud569\ub2c8\ub2e4.<\/p>\n\ud14c\uc2a4\ud2b8<\/h3>\n
main<\/code> \uba54\uc11c\ub4dc\uc5d0\uc11c\ub294 \ud14c\uc2a4\ud2b8 \uc785\ub825 \ubc30\uc5f4\uc744 \uc815\uc758\ud558\uace0, \ud568\uc218 \ud638\ucd9c \ud6c4 \uc81c\uacf1\uc774 \uc544\ub2cc \uc218\ub4e4\uc758 \ub9ac\uc2a4\ud2b8\ub97c \ucd9c\ub825\ud569\ub2c8\ub2e4.<\/p>\n\uacb0\uacfc \ubd84\uc11d<\/h2>\n
{1, 2, 3, 4, 5, 9, 10, 15, 16, 20}<\/code>\uc5d0\uc11c \uc81c\uacf1\uc774 \uc544\ub2cc \uc218\ub4e4\uc740 {2, 3, 5, 10, 15, 20}<\/code>\uc785\ub2c8\ub2e4. \uc774\ub294 \uc54c\uace0\ub9ac\uc998\uc758 \uc815\ud655\uc131\uc744 \ud655\uc778\ud558\ub294 \uc911\uc694\ud55c \uacfc\uc815\uc785\ub2c8\ub2e4.<\/p>\n\ubcf5\uc7a1\ub3c4 \ubd84\uc11d<\/h2>\n
O(N)<\/code>\uc785\ub2c8\ub2e4. \ubc30\uc5f4\uc758 \uc218\ub97c \ud55c \ubc88\ub9cc \uc21c\ud68c\ud558\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \uacf5\uac04 \ubcf5\uc7a1\ub3c4\ub294 \uacb0\uacfc \ub9ac\uc2a4\ud2b8\ub97c \uc800\uc7a5\ud558\ub294 \ub370 \uc18c\uc694\ub418\ub294 \uacf5\uac04 \ub54c\ubb38\uc774\ubbc0\ub85c \ucd5c\uc545\uc758 \uacbd\uc6b0 O(N)<\/code>\uc774 \ub429\ub2c8\ub2e4.<\/p>\n\ub9c8\ubb34\ub9ac<\/h2>\n