HDU 1255 - 覆盖的面积


http://acm.hdu.edu.cn/showproblem.php?pid=1255
给定平面上若干矩形,求出被这些矩形覆盖过至少两次的区域的面积.

 

Input
输入数据的第一行是一个正整数T(1<=T<=100),代表测试数据的数量.每个测试数据的第一行是一个正整数N(1<=N<=1000),代表矩形的数量,然后是N行数据,每一行包含四个浮点数,代表平面上的一个矩形的左上角坐标和右下角坐标,矩形的上下边和X轴平行,左右边和Y轴平行.坐标的范围从0到100000.

注意:本题的输入数据较多,推荐使用scanf读入数据.
 

Output
对于每组测试数据,请计算出被这些矩形覆盖过至少两次的区域的面积.结果保留两位小数.
 

Sample Input
2 5 1 1 4 2 1 3 3 7 2 1.5 5 4.5 3.5 1.25 7.5 4 6 3 10 7 3 0 0 1 1 1 0 2 1 2 0 3 1
 

Sample Output
7.63 0.00

https://blog.csdn.net/Mr_Treeeee/article/details/76039113
cnt[x]即代表x区间的线段存在了几次,>=2即是重合了一次或多次。 用法和HDU 1542相同。
然后每次计算就询问一次。乘以高度就行。

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