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3277：City Horizon

题目描述

Farmer John has taken his cows on a trip to the city! As the sun sets, the cows gaze at the city horizon and observe the beautiful silhouettes formed by the rectangular buildings.

The entire horizon is represented by a number line with N (1 ≤ N ≤ 40,000) buildings. Building i's silhouette has a base that spans locations Ai through Bi along the horizon (1 ≤ Ai < Bi ≤ 1,000,000,000) and has height Hi (1 ≤ Hi ≤ 1,000,000,000). Determine the area, in square units, of the aggregate silhouette formed by all N buildings.

输入解释
Line 1: A single integer: N
Lines 2..N+1: Input line i+1 describes building i with three space-separated integers: Ai, Bi, and Hi
输出解释
Line 1: The total area, in square units, of the silhouettes formed by all N buildings
输入样例 
4
2 5 1
9 10 4
6 8 2
4 6 3
输出样例 
16
提示
The first building overlaps with the fourth building for an area of 1 square unit, so the total area is just 3*1 + 1*4 + 2*2 + 2*3 - 1 = 16.
该题目是Virtual Judge题目，来自 北京大学POJ
题目来源 USACO 2007 Open Silver
源链接： POJ-3277
最后修改于 2020-10-29T06:57:34+00:00 由爬虫自动更新
共提交 0 次
通过率 --%
时间上限 内存上限
2000 65536