过度种草 - Problem

#21269. 过度种草

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Farmer John 买了新机器，能在任意轴对齐矩形区域（边为水平和竖直）种草。一天故障后，它种的不是一块，而是 $N$ 块（$1 \le N \le 1000$），可能重叠。

给定这些区域，求农场现被草覆盖的总面积。

输入格式

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

输出格式

第 1 行：被草覆盖总面积，可能超出 32 位整数。

样例

输入格式 1

2
0 5 4 1
2 4 6 2

输出格式 1

题目作者：Brian Dean，2012

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