# HDU 5726 GCD

Source: Internet
Author: User

Transmission Door

GCD

Time limit:10000/5000 MS (java/others) Memory limit:65536/65536 K (java/others)

problem Description
Give you a sequence of $N (n≤100,000)$ integers: $a _1,\cdots,a_n (0<a_i≤1000,000,000)$. There is $Q (q≤100,000)$ queries. For each query $l, R$ calculate $\TEXT{GCD} (A_l,,a_{l+1},\cdots,a_r)$ and count the number of pairs$(l′,r′) <r≤n)$such that $\TEXT{GCD} (a_{l′},a_{l′+1},\cdots,a_{r′})$ equal $\TEXT{GCD} (A_l,a_{l+1},..., A_{r})$.

Input
The first line of input contains a number $T$, which stands for the number of test cases you need to solve.

The first line of all case contains a number $N$, denoting the number of integers.

The second line contains $N$ integers, $a _1,\cdots,a_n (0<a_i≤1000,000,000)$.

The third line contains a number $Q$, denoting the number of queries.

For the next $Q$ lines, $i \text{-th}$ line contains, and stand for the $l _i,r_i$, stand for the $i \text{-th}$ quer ies.

Output
Need to output ' case #:t ' at the beginning. (with quotes, t means the number of the "test Case", begin from 1).

For each query, you need to the output of the numbers in a line. The first number stands for $\TEXT{GCD} (a_l,a_{l+1}, \cdots,a_r)$ and the second number stands for the number of pairs$(l′ , r′)$ such that $\TEXT{GCD} (a_{l′},a_{l′+1},\cdots,a_{r′})$ equal $\text{gcd} (A_l,a_{l+1},\cdots,a_r)$.

Sample Input

1
5
1 2 4) 6 7
4
1 5
2 4
3 4
4 4

Sample Output

Case #1:
1 8
2 4
2 4
6 1

Author
Hit

Source
Multi-university Training Contest 1

Test instructions

Support query: (1) Interval gcd, (2) gcd value equals K interval number

Solution:

Interval GCD Query line tree can be resolved, in addition to support a single point of modification. But this problem requires support query gcd value equals k interval number, line tree is a bit weak, because this information is probably not very good by merging interval information to get. Let's consider the nature of the interval gcd:

Make $\text{gcd}_r (l)$ indicate, L to r gcd. we

HDU 5726 GCD

Related Keywords:

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