Valera and Queries

2000ms

524288K

Description:

Valera loves segments. He has recently come up with one interesting problem.

The Ox axis of coordinates has n segments, the i-th segment starts in position l_i and ends in position r_i (we will mark it as [l_i, r_i]). Your task is to process m queries, each consists of number cnt_i and a set of cnt_i coordinates of points located on the Ox axis. The answer to the query is the number of segments, such that each of them contains at least one point from the query. Segment [l, r] contains point q, if l ≤ q ≤ r.

Valera found the solution of this problem too difficult. So he asked you to help him. Help Valera.

Input:

The first line contains two integers n, m (1 ≤ n, m ≤ 3·10⁵) — the number of segments on the axis of coordinates and the number of queries.

Next n lines contain the descriptions of the segments. The i-th line contains two positive integers l_i, r_i (1 ≤ l_i ≤ r_i ≤ 10⁶) — the borders of the i-th segment.

Next m lines contain the description of the queries, one per line. Each line starts from integer cnt_i (1 ≤ cnt_i ≤ 3·10⁵) — the number of points in the i-th query. Then the line contains cnt_i distinct positive integers p₁, p₂, ..., p_{cnt_i} (1 ≤ p₁ < p₂ < ... < p_{cnt_i} ≤ 10⁶) — the coordinates of points in the i-th query.

It is guaranteed that the total number of points in all queries doesn't exceed 3·10⁵.

Output:

Print m non-negative integers, where the i-th number is the response to the i-th query.

Sample Input:

Sample Output:

3
1
0

Informação

Provedor Codeforces

Código CF369E