5612번 - 터널의 입구와 출구 다국어

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1 초 128 MB36751907173752.304%

문제

상근이는 남산1호터널의 입구와 출구에서 1분에 통과하는 차량의 수를 조사했다. 이때, 터널에 차량이 가장 많이 있었을 때, 몇 대 있었는지 구하는 프로그램을 작성하시오.

입력

첫째 줄에 조사한 시간 n이 주어진다. 둘째 줄에는 조사를 시작할 때, 터널 안에 들어있는 차량의 수 m이 주어진다. 다음 n개 줄의 i번째 줄(i = 1 ~ n)의 정보는 조사를 시작한지 (i-1)분이 경과한 시점부터 i분 경과할 때 까지 1분에 입구를 통과한 차의 수와 출구를 통과한 차의 수이다. n은 10000보다 작거나 같고, 1분에 통과하는 차량의 수는 100이하이다.

출력

조사 시작하고 j분이 지난 시점 (j = 0~n)에서 터널 안에 있는 차량의 수를 Sj라고 하자. 이때, Sj의 최댓값을 출력한다. 만약, 터널 안에 있는 차량의 수가 0보다 작은 경우가 한 번 이라도 발생한다면 0을 출력한다.

예제 입력 1 

3
2
2 3
2 3
4 1

예제 출력 1 

3

예제 입력 2 

3
2
2 3
2 4
4 1

예제 출력 2 

0

예제 입력 3 

3
2
2 3
2 3
1 0

예제 출력 3 

2
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

출처

Olympiad > Japanese Olympiad in Informatics > Japanese Olympiad in Informatics Qualification Round > JOI 2006 모의고사 2 1번

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