Restore Atlantis II

There are $n$ ancient Greek maps describing the fabled islands Atlantis. The maps are labeled by $1,2,\dots,n$. The $i$-th map shows the rectangle area $R_i$ is a part of Atlantis. The sides of all rectangles are parallel to the axes. There may be multiple islands, and the rectangles may overlap.

Unfortunately, some maps are even unreliable so they will not be considered. You will be given $q$ queries. In the $i$-th query, you will be given two integers $s_i$ and $t_i$ ($1\leq s_i\leq t_i\leq n$). Please write a program to figure out the total area of Atlantis when only maps labeled by $k$ ($s_i\leq k\leq t_i$) are reliable.

The first line contains a single integer $T$ ($1 \leq T \leq 3$), the number of test cases. For each test case:

The first line of the input contains two integers $n$ and $q$ ($1 \leq n,q \leq 100\,000$), denoting the number of maps and the number of queries.

In the next $n$ lines, the $i$-th line contains four integers $xa_i$, $ya_i$, $xb_i$ and $yb_i$ ($0\le xa_i<xb_i\leq 10^9$, $0\le ya_i<yb_i\leq 10^9$), describing the $i$-th map $R_i$. $(xa_i,ya_i)$ is the southwest corner of $R_i$, and $(xb_i,yb_i)$ is the northeast corner of $R_i$.

In the next $q$ lines, the $i$-th line contains two integers $s_i$ and $t_i$ ($1\leq s_i\leq t_i\leq n$), describing the $i$-th query.

It is guaranteed that all the values of $xa_i$, $ya_i$, $xb_i$, $yb_i$, $s_i$ and $t_i$ are chosen uniformly at random from integers in their corresponding ranges. The randomness condition does not apply to the sample test case, but your solution must pass the sample as well.

For each query, print a single line containing an integer, denoting the total area using the information of all reliable maps in this query.

1
3 6
10 10 20 20
12 12 22 22
15 15 25 25
1 1
2 2
3 3
1 2
2 3
1 3

100
100
100
136
151
187

2021“MINIEYE杯”中国大学生算法设计超级联赛（3）