\n \uc120\ubd84\uc758 \uc9d1\ud569\uc774 \uc8fc\uc5b4\uc84c\uc744 \ub54c, \uc11c\ub85c \uacb9\uce58\uc9c0 \uc54a\ub3c4\ub85d \uc120\ubd84\uc744 \uadf8\ub8f9\uc73c\ub85c \ub098\ub204\ub294 \ubb38\uc81c\uc785\ub2c8\ub2e4.
\n \uac01 \uc120\ubd84\uc740 \uc2dc\uc791\uc810\uacfc \ub05d\uc810\uc73c\ub85c \uc815\uc758\ub429\ub2c8\ub2e4. \uc120\ubd84\ub4e4 \uc0ac\uc774\uc5d0 \uacb9\uce58\ub294 \ubd80\ubd84\uc774 \uc788\uc73c\uba74 \uac19\uc740 \uadf8\ub8f9\uc5d0 \uc18d\ud574\uc57c \ud558\uba70,
\n \uacb9\uce58\uc9c0 \uc54a\ub294 \uc120\ubd84\ub4e4\uc740 \ub2e4\ub978 \uadf8\ub8f9\uc5d0 \uc18d\ud574\uc57c \ud569\ub2c8\ub2e4.\n <\/p>\n
N<\/code> (1 \u2264 N \u2264 100,000)\uc774 \uc8fc\uc5b4\uc9d1\ub2c8\ub2e4.<\/li>\n- \ub450 \ubc88\uc9f8 \uc904\ubd80\ud130
N<\/code>\uac1c\uc758 \uc904\uc5d0 \uac01\uac01\uc758 \uc120\ubd84\uc758 \uc2dc\uc791\uc810 l<\/code>\uacfc \ub05d\uc810 r<\/code> (l <= r<\/code>)\uc774 \uc8fc\uc5b4\uc9d1\ub2c8\ub2e4.<\/li>\n<\/ul>\n\ucd9c\ub825<\/h3>\n
\n \ucd1d \ud544\uc694\ud55c \uadf8\ub8f9\uc758 \uc218\ub97c \ucd9c\ub825\ud569\ub2c8\ub2e4.\n <\/p>\n
\uc608\uc81c \uc785\ub825<\/h3>\n\n 5\n 1 3\n 2 5\n 6 8\n 7 10\n 11 15\n <\/pre>\n\uc608\uc81c \ucd9c\ub825<\/h3>\n\n 3\n <\/pre>\n\uc124\uba85<\/h3>\n
\n \uc8fc\uc5b4\uc9c4 \uc120\ubd84\ub4e4\uc744 \ubcf4\uba74, \uccab \ubc88\uc9f8\uc640 \ub450 \ubc88\uc9f8 \uc120\ubd84\uc740 \uacb9\uce58\ubbc0\ub85c \uac19\uc740 \uadf8\ub8f9\uc5d0 \uc18d\ud569\ub2c8\ub2e4.
\n \uc138 \ubc88\uc9f8\uc640 \ub124 \ubc88\uc9f8 \uc120\ubd84\ub3c4 \uacb9\uce58\ubbc0\ub85c \ub458\uc740 \uac19\uc740 \uadf8\ub8f9\uc5d0 \uc18d\ud558\uace0,
\n \ub9c8\uc9c0\ub9c9 \uc120\ubd84\uc740 \ub2e4\ub978 \uadf8\ub8f9\uc5d0 \uc18d\ud558\ubbc0\ub85c \ucd1d 3\uac1c\uc758 \uadf8\ub8f9\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.\n <\/p>\n<\/div>\n
\n\ud574\uacb0 \ubc29\ubc95<\/h2>\n
\n \uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \uc62c\ubc14\ub978 \uc811\uadfc \ubc29\uc2dd\uc740 \uc120\ubd84\uc744 \uc815\ub82c\ud55c \ud6c4,
\n \uc11c\ub85c \uacb9\uce58\ub294 \uc120\ubd84\uc744 \uc21c\ucc28\uc801\uc73c\ub85c \ube44\uad50\ud558\uc5ec \uadf8\ub8f9\uc744 \uc0dd\uc131\ud558\ub294 \uac83\uc785\ub2c8\ub2e4.
\n \ub2e4\uc74c\uacfc \uac19\uc740 \ub2e8\uacc4\ub85c \ubb38\uc81c\ub97c \ud574\uacb0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\n <\/p>\n
1\ub2e8\uacc4: \uc785\ub825 \ubc1b\uae30<\/h3>\n
\n \uc120\ubd84\uc744 \ub9ac\uc2a4\ud2b8\ub85c \uc785\ub825\ubc1b\uc2b5\ub2c8\ub2e4. \uac01 \uc120\ubd84\uc740 \uc30d\uc73c\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\uc73c\ubbc0\ub85c
\n Pair<\/code> \ud074\ub798\uc2a4\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc120\ubd84\uc744 \uc800\uc7a5\ud569\ub2c8\ub2e4.\n <\/p>\n2\ub2e8\uacc4: \uc120\ubd84 \uc815\ub82c<\/h3>\n
\n \uc120\ubd84\ub4e4\uc744 \uc815\ub82c\ud558\ub294 \uae30\uc900\uc740 \uc2dc\uc791\uc810\uc785\ub2c8\ub2e4.
\n \uc2dc\uc791\uc810\uc774 \uc791\uc740 \uc21c\uc11c\ub85c \uc815\ub82c\ud55c \ud6c4, \ub9cc\uc57d \uc2dc\uc791\uc810\uc774 \uac19\ub2e4\uba74 \ub05d\uc810\uc774 \uc9e7\uc740 \uac83\uc774 \uba3c\uc800 \uc624\ub3c4\ub85d \uc815\ub82c\ud569\ub2c8\ub2e4.\n <\/p>\n
3\ub2e8\uacc4: \uadf8\ub8f9\ud654<\/h3>\n
\n \uc815\ub82c\ub41c \ub9ac\uc2a4\ud2b8\ub97c \uc21c\ud68c\ud558\uba74\uc11c \ud604\uc7ac \uadf8\ub8f9\uc758 \ub9c8\uc9c0\ub9c9 \uc120\ubd84\uacfc \uacb9\uce58\ub294\uc9c0 \ud655\uc778\ud569\ub2c8\ub2e4.
\n \uacb9\uce58\uba74 \uac19\uc740 \uadf8\ub8f9\uc5d0 \uc18d\ud558\uac8c \ub418\uace0, \uacb9\uce58\uc9c0 \uc54a\uc73c\uba74 \uc0c8\ub85c\uc6b4 \uadf8\ub8f9\uc744 \uc2dc\uc791\ud569\ub2c8\ub2e4.\n <\/p>\n
4\ub2e8\uacc4: \uacb0\uacfc \ucd9c\ub825<\/h3>\n
\n \ucd5c\uc885\uc801\uc73c\ub85c \uadf8\ub8f9\uc758 \uc218\ub97c \uc138\uc5b4 \ucd9c\ub825\ud569\ub2c8\ub2e4.\n <\/p>\n
\ucf54\ub4dc \uc608\uc2dc (Kotlin)<\/h3>\n\n data class Segment(val start: Int, val end: Int)\n\n fun countGroups(segments: List): Int {\n val sortedSegments = segments.sortedWith(compareBy({ it.start }, { it.end }))\n var groupCount = 0\n var maxEnd = -1\n\n for (segment in sortedSegments) {\n if (segment.start > maxEnd) {\n groupCount++\n maxEnd = segment.end\n } else {\n maxEnd = maxOf(maxEnd, segment.end)\n }\n }\n return groupCount\n }\n\n fun main() {\n val n = readLine()!!.toInt()\n val segments = List(n) {\n val (l, r) = readLine()!!.split(\" \").map { it.toInt() }\n Segment(l, r)\n }\n println(countGroups(segments))\n }\n <\/segment><\/pre>\n\uacb0\ub860<\/h3>\n
\n \uc774 \ubb38\uc81c\ub97c \ud1b5\ud574 \uc120\ubd84\uc758 \uadf8\ub8f9\ud654 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub294 \ubc29\ubc95\uc744 \ubc30\uc6e0\uc2b5\ub2c8\ub2e4.
\n \uc815\ub82c\uacfc \ub9ac\uc2a4\ud2b8 \uc21c\ud68c\ub97c \ud1b5\ud574 \ud6a8\uacfc\uc801\uc73c\ub85c \uadf8\ub8f9\uc758 \uc218\ub97c \uad6c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.
\n \ucf54\ud2c0\ub9b0\uc744 \ud65c\uc6a9\ud558\uc5ec \uc791\uc131\ud55c \ucf54\ub4dc \uad6c\uc870\ub294 \uc7ac\uc0ac\uc6a9\uc131\uc774 \ub192\uace0 \uc774\ud574\ud558\uae30 \uc26c\uc6b4 \ud615\ud0dc\ub85c
\n \uc791\uc131\ud560 \uc218 \uc788\uc5c8\uc74c\uc744 \ud655\uc778\ud588\uc2b5\ub2c8\ub2e4.
\n \ucf54\ub529\ud14c\uc2a4\ud2b8\uc5d0 \uc788\uc5b4\uc11c \uc120\ubd84 \ubb38\uc81c\ub294 \uc790\uc8fc \ucd9c\uc81c\ub418\ub294 \uc720\ud615\uc774\ubbc0\ub85c,
\n \uc774\uc640 \uc720\uc0ac\ud55c \ubb38\uc81c\ub4e4\uc744 \uc5f0\uc2b5\ud574\ubcf4\ub294 \uac83\uc774 \uc88b\uc2b5\ub2c8\ub2e4.\n <\/p>\n<\/div>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"