Ela Takes Dancing Class

4000ms

262144K

Description:

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DTL engineers love partying in the weekend. Ela does, too! Unfortunately, she didn't know how to dance yet. Therefore, she decided to take a dancing class.

There are $$$n$$$ students in the dancing class, including Ela. In the final project, $$$n$$$ students will participate in a choreography described below.

$$$n$$$ students are positioned on the positive side of the $$$Ox$$$-axis. The $$$i$$$-th dancer is located at $$$a_i > 0$$$. Some dancers will change positions during the dance (we'll call them movable dancers), and others will stay in the same place during a choreography (we'll call them immovable dancers). We distinguish the dancers using a binary string $$$s$$$ of length $$$n$$$: if $$$s_i$$$ equals '1', then the $$$i$$$-th dancer is movable, otherwise the $$$i$$$-th dancer is immovable.

Let's call the "positive energy value" of the choreography $$$d > 0$$$. The dancers will perform "movements" based on this value.

Each minute after the dance begins, the movable dancer with the smallest $$$x$$$-coordinate will start moving to the right and initiate a "movement". At the beginning of the movement, the dancer's energy level will be initiated equally to the positive energy value of the choreography, which is $$$d$$$. Each time they move from some $$$y$$$ to $$$y+1$$$, the energy level will be decreased by $$$1$$$. At some point, the dancer might meet other fellow dancers in the same coordinates. If it happens, then the energy level of the dancer will be increased by $$$1$$$. A dancer will stop moving to the right when his energy level reaches $$$0$$$, and he doesn't share a position with another dancer.

The dancers are very well-trained, and each "movement" will end before the next minute begins.

To show her understanding of this choreography, Ela has to answer $$$q$$$ queries, each consisting of two integers $$$k$$$ and $$$m$$$. The answer to this query is the coordinate of the $$$m$$$-th dancer of both types from the left at $$$k$$$-th minute after the choreography begins. In other words, denote $$$x_{k, 1}, x_{k, 2}, \dots, x_{k, n}$$$ as the sorted coordinates of the dancers at $$$k$$$-th minute from the beginning, you need to print $$$x_{k, m}$$$.

Input:

The first line contains three integers $$$n$$$, $$$d$$$ and $$$q$$$ ($$$1 \le n \le 10^5$$$; $$$1 \le d \le 10^9$$$; $$$1 \le q \le 10^5$$$) — the number of dancers, the positive energy value of the choreography, and the number of queries.

The second line contains $$$n$$$ integers $$$a_1, a_2, \dots, a_n$$$ ($$$1 \le a_1 < a_2 < \dots < a_n \le 10^9$$$) — the coordinates of each dancer.

The third line contains a binary string $$$s$$$ of length $$$n$$$ — the movability of each dancer. Each character is either '0' or '1'. It is guaranteed that $$$s$$$ contains at least one character '1'.

Then $$$q$$$ lines follow, the $$$i$$$-th of them contains two integers $$$k_i$$$ and $$$m_i$$$ ($$$1 \le k_i \le 10^9$$$, $$$1 \le m_i \le n$$$) — the content of each query.

Output:

Output $$$q$$$ lines, each contains a single integer — the answer for the corresponding query.

Sample Input:

Sample Output:

Sample Input:

Sample Output:

Note:

Let's consider the first example test case.

In the first minute, $$$1$$$ is the lowest coordinate between movable dancers. The energy level is initiated with $$$3$$$. Then the following happens:

The dancer moves from $$$1$$$ to $$$2$$$. The energy level decreased to $$$2$$$.
The dancer moves from $$$2$$$ to $$$3$$$. The energy level decreased to $$$1$$$, then increased to $$$2$$$ when she met another dancer at $$$3$$$.
The dancer moves from $$$3$$$ to $$$4$$$. The energy level decreased to $$$1$$$.
The dancer moves from $$$4$$$ to $$$5$$$. The energy level decreased to $$$0$$$.

At the end of the first minute, the sorted coordinates of the dancers become $$$[3, 5, 6, 7]$$$, and their respective movability is '0111'.

In the second minute, $$$5$$$ is the lowest coordinate between movable dancers. The energy level is initiated with $$$3$$$. Then the following happens:

The dancer moves from $$$5$$$ to $$$6$$$. The energy level decreased to $$$2$$$, then increased to $$$3$$$ when she met another dancer at $$$6$$$.
The dancer moves from $$$6$$$ to $$$7$$$. The energy level decreased to $$$2$$$, then increased to $$$3$$$ when she met another dancer at $$$7$$$.
The dancer moves from $$$7$$$ to $$$8$$$. The energy level decreased to $$$2$$$.
The dancer moves from $$$8$$$ to $$$9$$$. The energy level decreased to $$$1$$$.
The dancer moves from $$$9$$$ to $$$10$$$. The energy level decreased to $$$0$$$.

At the end of the second minute, the sorted coordinates of the dancers become $$$[3, 6, 7, 10]$$$, and their respective movability is '0111'.

Informação

Provedor Codeforces

Código CF1737G