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문제

상근이는 점점 부자가 되었고 트럭 운송 회사를 차렸다. 이 회사에는 트럭이 총 N대 있고, 모든 배달은 "공부 고속도로"를 통해 이루어진다.

공부 고속도로에는 나들목(인터체인지, IC)이 1,000,000개 있다. 그리고, 각 나들목은 1번부터 순서대로 번호가 매겨져 있다. 나들목에서는 고속도로로 들어오거나 나갈 수 있다.

고속도로에 들어갈 때는 들어온 나들목의 번호가 적혀있는 티켓을 하나 받게 된다. 이 티켓은 고속도로에서 나갈 때 요금소(톨게이트)에 제시해야하고, 들어온 나들목과 나가는 나들목 번호의 차이만큼 요금을 내야 한다. 예를 들어, 티켓에 적혀있는 나들목의 번호가 30이고 12번 나들목으로 나간다면, 요금은 18원이 된다.

고속도로 이용 요금은 점점 회사가 감당할 수 없는 수준까지 치솟았고, 상근이는 획기적인 방법을 생각해냈다. 바로, 고속도로 중간에서 두 운전사가 만나서 티켓을 교환하는 것이다. 이 방법은 서로 경로가 겹치지 않더라도 교환할 수 있으며, 티켓은 여러 번 교환할 수 있다.

하지만, 의심을 피하기 위해서 티켓에 적혀있는 나들목의 번호와 같은 나들목으로 나갈 수는 없다. 

운전사끼리 티켓을 적절히 교환했을 때, 내야하는 고속도로 이용 요금의 최소값을 구하는 프로그램을 작성하시오.

입력

첫째 줄에 트럭의 수 N이 주어진다. (1 ≤ N ≤ 100,000)

다음 N개 줄에는 각 트럭이 들어온 나들목의 번호와 나가야 하는 나들목의 번호가 공백으로 구분해서 주어진다. 나들목의 번호는 1보다 크거나 같고, 1,000,000보다 작거나 같은 자연수이다.

두 트럭이 고속도로로 들어올 때 사용하는 나들목의 번호나 나갈 때 사용하는 나들목의 번호가 같은 경우는 없다.

출력

상근이네 트럭 운송 회사가 내야하는 고속도로 이용 요금의 최소값을 출력한다. 이 값은 32비트 정수 범위를 넘어갈 수 있기 때문에, 64비트 정수(C/C++: long long)을 사용해야 한다.

예제 입력 1

3
3 65
45 10
60 25

예제 출력 1

32
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(1 &le; N &le; 100,000)<\/p>\r\n\r\n<p>\ub2e4\uc74c N\uac1c \uc904\uc5d0\ub294 \uac01 \ud2b8\ub7ed\uc774 \ub4e4\uc5b4\uc628 \ub098\ub4e4\ubaa9\uc758 \ubc88\ud638\uc640 \ub098\uac00\uc57c \ud558\ub294 \ub098\ub4e4\ubaa9\uc758 \ubc88\ud638\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ud574\uc11c \uc8fc\uc5b4\uc9c4\ub2e4. \ub098\ub4e4\ubaa9\uc758 \ubc88\ud638\ub294 1\ubcf4\ub2e4 \ud06c\uac70\ub098 \uac19\uace0, 1,000,000\ubcf4\ub2e4 \uc791\uac70\ub098 \uac19\uc740 \uc790\uc5f0\uc218\uc774\ub2e4.<\/p>\r\n\r\n<p>\ub450 \ud2b8\ub7ed\uc774 \uace0\uc18d\ub3c4\ub85c\ub85c \ub4e4\uc5b4\uc62c \ub54c \uc0ac\uc6a9\ud558\ub294 \ub098\ub4e4\ubaa9\uc758 \ubc88\ud638\ub098 \ub098\uac08 \ub54c \uc0ac\uc6a9\ud558\ub294 \ub098\ub4e4\ubaa9\uc758 \ubc88\ud638\uac00 \uac19\uc740 \uacbd\uc6b0\ub294 \uc5c6\ub2e4.<\/p>\r\n","output":"<p>\uc0c1\uadfc\uc774\ub124 \ud2b8\ub7ed \uc6b4\uc1a1 \ud68c\uc0ac\uac00 \ub0b4\uc57c\ud558\ub294 \uace0\uc18d\ub3c4\ub85c \uc774\uc6a9 \uc694\uae08\uc758 \ucd5c\uc18c\uac12\uc744 \ucd9c\ub825\ud55c\ub2e4. \uc774 \uac12\uc740 32\ube44\ud2b8 \uc815\uc218 \ubc94\uc704\ub97c \ub118\uc5b4\uac08 \uc218 \uc788\uae30 \ub54c\ubb38\uc5d0, 64\ube44\ud2b8 \uc815\uc218(C\/C++: long long)\uc744 \uc0ac\uc6a9\ud574\uc57c \ud55c\ub2e4.<\/p>\r\n","hint":"","original":"0","problem_lang_code":"\ud55c\uad6d\uc5b4"},{"problem_id":"2984","problem_lang":"1","title":"CESTARINE","description":"<p>In a single day, N of Luka&#39;s trucks travel a specific highway. The highway has a number of exits and entrances. An exit with a particular number is in the same location as the entrance with that number.&nbsp;<\/p>\r\n\r\n<p>Upon entering the highway, a truck driver receives a ticket which indicates the entrance he used. When exiting, the driver pays a toll equal to the absolute difference of the entrance and exit numbers. For example, if a ticket says he used entrance 30, then exiting at exit 12 will cost him 18.&nbsp;<\/p>\r\n\r\n<p>Luka has figured out a way to save toll money that his company daily spends. Any two drivers can meet on the highway and exchange tickets, even if their routes don&#39;t overlap. Tickets can be exchanged an arbitrary number of times.&nbsp;<\/p>\r\n\r\n<p>However, a driver cannot use an exit if his ticket says he used the same entrance, since that would be suspicious.&nbsp;<\/p>\r\n\r\n<p>Write a program that calculates the least total amount of tolls that the drivers can achieve by exchanging tickets.&nbsp;<\/p>\r\n","input":"<p>The first line contains the integer N (1 &le; N &le; 100000), the number of trucks.&nbsp;<\/p>\r\n\r\n<p>Each of the following N lines contains two distinct integers between 1 and 1000000. These are in order the entrance and exit numbers of one truck.&nbsp;<\/p>\r\n\r\n<p>No two trucks will use the same highway entrance or the same exit.&nbsp;<\/p>\r\n","output":"<p>Output the least total amount of tolls Luka&#39;s company must pay.&nbsp;<\/p>\r\n\r\n<p>Note: use 64-bit integer types (long long in C\/C++, int64 in Pascal).&nbsp;<\/p>\r\n","hint":"","original":"1","problem_lang_code":"\uc601\uc5b4"}]

출처

Contest > Croatian Open Competition in Informatics > COCI 2007/2008 > Contest #6 6번

  • 문제를 번역한 사람: baekjoon
  • 문제의 오타를 찾은 사람: jh05013