過度種草 - Problem

#21269. 過度種草

Statistics

Farmer John 買了新機器，能在任意軸對齊矩形區域（邊為水平和垂直）種草。一天故障後，它種的不是一塊，而是 $N$ 塊（$1 \le N \le 1000$），可能重疊。

給定這些區域，求農場現被草涵蓋的總面積。

輸入格式

第 1 行：整數 $N$。
第 2..1+$N$ 行：每行空格分隔的整數 $x1$、$y1$、$x2$、$y2$，指定左上角 $(x1,y1)$、右下角 $(x2,y2)$ 的矩形。所有座標在 $-10^8...10^8$。

輸出格式

第 1 行：被草涵蓋總面積，可能超出 32 位元整數。

範例

輸入格式 1

2
0 5 4 1
2 4 6 2

輸出格式 1

題目作者：Brian Dean，2012

Discussions

About Discussions

The discussion section is only for posting: General Discussions (problem-solving strategies, alternative approaches), and Off-topic conversations.

This is NOT for reporting issues! If you want to report bugs or errors, please use the Issues section below.

Open Discussions 0

No discussions in this category.

Issues

About Issues

If you find any issues with the problem (statement, scoring, time/memory limits, test cases, etc.), you may submit an issue here. A problem moderator will review your issue.

Guidelines:

This is not a place to publish discussions, editorials, or requests to debug your code. Issues are only visible to you and problem moderators.
Do not submit duplicated issues.
Issues must be filed in English or Chinese only.

Active Issues 0

No issues in this category.

Closed/Resolved Issues 0