\uc548\ub155\ud558\uc138\uc694! \uc624\ub298\uc740 ‘\uad6c\uac04 \ud569 \uad6c\ud558\uae30 3’\ub77c\ub294 \uc8fc\uc81c\ub85c \uc790\ubc14 \ucf54\ub529\ud14c\uc2a4\ud2b8 \ubb38\uc81c\ub97c \ud568\uaed8 \ud480\uc5b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc774 \ubb38\uc81c\ub294 \uc8fc\uc5b4\uc9c4 \ubc30\uc5f4\uc5d0\uc11c \ud2b9\uc815 \uad6c\uac04\uc758 \ud569\uc744 \ud6a8\uc728\uc801\uc73c\ub85c \uad6c\ud558\ub294 \uc54c\uace0\ub9ac\uc998\uc744 \uad6c\uc131\ud558\ub294 \uac83\uc744 \ubaa9\ud45c\ub85c \ud569\ub2c8\ub2e4. \uadf8\ub7ec\uba74 \ubb38\uc81c\ub97c \uc0b4\ud3b4\ubcf4\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc8fc\uc5b4\uc9c4 \uc815\uc218 \ubc30\uc5f4 \uac01 \ucffc\ub9ac\uc758 \uacb0\uacfc\ub97c \ud55c \uc904\uc5d0 \ud558\ub098\uc529 \ucd9c\ub825\ud55c\ub2e4.<\/p>\n 1-indexed \ubc30\uc5f4\uc5d0\uc11c \ud2b9\uc815 \uad6c\uac04\uc758 \ud569\uc744 \uad6c\ud558\uae30 \uc704\ud574\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n \uc790\ubc14\ub85c \uc54c\uace0\ub9ac\uc998\uc744 \uad6c\ud604\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc544\ub798\ub294 \uc2e4\uc81c \ucf54\ub4dc\uc785\ub2c8\ub2e4:<\/p>\n \uc704 \ucf54\ub4dc\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uad6c\uc870\ub85c \ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n \uc774 \uc54c\uace0\ub9ac\uc998\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n \uacb0\ub860\uc801\uc73c\ub85c, \uc804\uccb4 \uc54c\uace0\ub9ac\uc998\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(N + M)\uc785\ub2c8\ub2e4. \uc774\ub294 \ubb38\uc81c\ub97c \ud6a8\uc728\uc801\uc73c\ub85c \ud574\uacb0\ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc785\ub2c8\ub2e4.<\/p>\n \uc624\ub298\uc740 ‘\uad6c\uac04 \ud569 \uad6c\ud558\uae30 3’ \ubb38\uc81c\ub97c \ud1b5\ud574 Java \uc5b8\uc5b4\ub85c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \ubc29\ubc95\uc744 \ubc30\uc6cc\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \ud569 \ubc30\uc5f4\uc744 \ud65c\uc6a9\ud558\uc5ec \ucffc\ub9ac\uc758 \ud6a8\uc728\uc131\uc744 \ub192\uc774\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc774\ud574\ud558\uc168\uae30\ub97c \ubc14\ub78d\ub2c8\ub2e4. \ucd94\uac00\uc801\uc778 \ubb38\uc81c\ub97c \ud1b5\ud574 \ub354 \ub9ce\uc740 \uc5f0\uc2b5\uc744 \ud574\ubcf4\uc138\uc694. \ub2e4\uc74c \uac15\uc88c\uc5d0\uc11c\ub294 \ub2e4\ub978 \uc8fc\uc81c\ub85c \ucc3e\uc544\ubd59\uaca0\uc2b5\ub2c8\ub2e4. \uac10\uc0ac\ud569\ub2c8\ub2e4!<\/p>\n <\/body><\/p>\n","protected":false},"excerpt":{"rendered":"A<\/code>\uc640 m<\/code>\uac1c\uc758 \ucffc\ub9ac\uac00 \uc8fc\uc5b4\uc9c8 \ub54c, \uac01 \ucffc\ub9ac\ub294 \ub450 \uac1c\uc758 \uc815\uc218 X<\/code>\uc640 Y<\/code>\ub85c \ub098\ud0c0\ub0b4\uba70, A[X] + A[X+1] + ... + A[Y]<\/code>\uc758 \uac12\uc744 \ucd9c\ub825\ud558\ub294 \ubb38\uc81c\uc785\ub2c8\ub2e4. \ub2e8, \ucffc\ub9ac\ub294 1-indexed\uc785\ub2c8\ub2e4.<\/p>\n\uc785\ub825 \ud615\uc2dd<\/h2>\n
\n
N<\/code> (\ubc30\uc5f4 \uc6d0\uc18c\uc758 \uac1c\uc218)\uacfc M<\/code> (\ucffc\ub9ac\uc758 \uac1c\uc218)\uac00 \uc8fc\uc5b4\uc9c4\ub2e4.<\/li>\nN<\/code>\uac1c\uc758 \uc815\uc218\ub85c \uc774\ub8e8\uc5b4\uc9c4 \ubc30\uc5f4 A<\/code>\uac00 \uc8fc\uc5b4\uc9c4\ub2e4.<\/li>\nM<\/code>\uac1c\uc758 \uc904\uc5d0 \uac01\uac01\uc758 \ucffc\ub9ac\ub97c \ub098\ud0c0\ub0b4\ub294 \ub450 \uac1c\uc758 \uc815\uc218 X<\/code>\uc640 Y<\/code>\uac00 \uc8fc\uc5b4\uc9c4\ub2e4.<\/li>\n<\/ul>\n\ucd9c\ub825 \ud615\uc2dd<\/h2>\n
\uc608\uc81c<\/h2>\n
\n\uc785\ub825 \uc608\uc81c:\n5 3\n1 2 3 4 5\n1 3\n2 4\n1 5\n\n\ucd9c\ub825 \uc608\uc81c:\n6\n9\n15\n<\/pre>\n
\ubb38\uc81c \uc811\uadfc \ubc29\ubc95<\/h2>\n
\n
sum[Y] - sum[X-1]<\/code>\ub85c \uacc4\uc0b0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc5ec\uae30\uc11c sum[i]<\/code>\ub294 \uc785\ub825 \ubc30\uc5f4\uc758 1\ubd80\ud130 i<\/code>\uae4c\uc9c0\uc758 \ud569\uc785\ub2c8\ub2e4.<\/li>\n<\/ol>\n\uc54c\uace0\ub9ac\uc998 \uad6c\ud604<\/h2>\n
import java.util.Scanner;\n\npublic class IntervalSum {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n \/\/ \ubc30\uc5f4 \ud06c\uae30 N\uacfc \ucffc\ub9ac \uac1c\uc218 M \uc785\ub825 \ubc1b\uae30\n int N = scanner.nextInt();\n int M = scanner.nextInt();\n\n \/\/ \ubc30\uc5f4 A \uc120\uc5b8 \ubc0f \uac12 \uc785\ub825\n long[] A = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n A[i] = scanner.nextLong();\n }\n\n \/\/ \ud569 \ubc30\uc5f4 \uc120\uc5b8\n long[] sum = new long[N + 1];\n\n \/\/ \ud569 \ubc30\uc5f4 \uc0dd\uc131\n for (int i = 1; i <= N; i++) {\n sum[i] = sum[i - 1] + A[i];\n }\n\n \/\/ \ucffc\ub9ac \ucc98\ub9ac\n for (int j = 0; j < M; j++) {\n int X = scanner.nextInt();\n int Y = scanner.nextInt();\n \/\/ \uad6c\uac04 \ud569 \uacc4\uc0b0 \ubc0f \ucd9c\ub825\n System.out.println(sum[Y] - sum[X - 1]);\n }\n\n \/\/ Scanner \ub2eb\uae30\n scanner.close();\n }\n}<\/code><\/pre>\n\ucf54\ub4dc \uc124\uba85<\/h2>\n
\n
Scanner<\/code>\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc785\ub825\uc744 \ubc1b\uc2b5\ub2c8\ub2e4. \ubc30\uc5f4\uc758 \ud06c\uae30(N<\/code>)\uc640 \ucffc\ub9ac\uc758 \uac1c\uc218(M<\/code>)\ub97c \uc77d\uc2b5\ub2c8\ub2e4.<\/li>\nA<\/code>\ub97c \ub9cc\ub4e4\uace0 1-indexed\ub85c \uac12\uc744 \ud560\ub2f9\ud569\ub2c8\ub2e4.<\/li>\nsum<\/code>\uc744 \uc0dd\uc131\ud569\ub2c8\ub2e4. \uc774 \ubc30\uc5f4\uc740 sum[i]<\/code>\uac00 \ubc30\uc5f4 A<\/code>\uc758 1\ubd80\ud130 i<\/code>\uae4c\uc9c0\uc758 \ud569\uc744 \uc800\uc7a5\ud569\ub2c8\ub2e4.<\/li>\nX<\/code>\uc640 Y<\/code>\ub97c \uc77d\uace0 \uad6c\uac04 \ud569\uc744 \uacc4\uc0b0\ud55c \ud6c4 \uacb0\uacfc\ub97c \ucd9c\ub825\ud569\ub2c8\ub2e4.<\/li>\n<\/ol>\n\uc2dc\uac04 \ubcf5\uc7a1\ub3c4 \ubd84\uc11d<\/h2>\n
\n
M<\/code>\uc5d0 \ub300\ud574 O(M)\uc758 \uc2dc\uac04\uc774 \uc18c\uc694\ub429\ub2c8\ub2e4.<\/li>\n<\/ul>\n\ub9c8\ubb34\ub9ac<\/h2>\n