#P3572. [POI2014] PTA-Little Bird

    ID: 2623 远端评测题 1000ms 125MiB 尝试: 0 已通过: 0 难度: 5 上传者: 标签>动态规划数据结构单调队列dp2014POI

[POI2014] PTA-Little Bird

题目描述

In the Byteotian Line Forest there are nn trees in a row.

On top of the first one, there is a little bird who would like to fly over to the top of the last tree.

Being in fact very little, the bird might lack the strength to fly there without any stop.

If the bird is sitting on top of the tree no. i, then in a single flight leg it can fly toany of the trees no. i+1,i+2,,i+ki+1,i+2,\cdots,i+k, and then has to rest afterward.

Moreover, flying up is far harder to flying down. A flight leg is tiresome if it ends in a tree at leastas high as the one where is started. Otherwise the flight leg is not tiresome.

The goal is to select the trees on which the little bird will land so that the overall flight is leasttiresome, i.e., it has the minimum number of tiresome legs.

We note that birds are social creatures, and our bird has a few bird-friends who would also like to getfrom the first tree to the last one. The stamina of all the birds varies,so the bird's friends may have different values of the parameter kk.

Help all the birds, little and big!

输入格式

There is a single integer nn (2n1 000 0002\le n\le 1\ 000\ 000) in the first line of the standard input:

the number of trees in the Byteotian Line Forest.

The second line of input holds nn integers d1,d2,,dnd_1,d_2,\cdots,d_n (1di1091\le d_i\le 10^9)separated by single spaces: did_i is the height of the i-th tree.

The third line of the input holds a single integer qq (1q251\le q\le 25): the number of birds whoseflights need to be planned.

The following qq lines describe these birds: in the ii-th of these lines, there is an integer kik_i (1kin11\le k_i\le n-1) specifying the ii-th bird's stamina. In other words, the maximum number of trees that the ii-th bird can pass before it has to rest is ki1k_i-1.

输出格式

Your program should print exactly qq lines to the standard output.

In the ii-th line, it should specify the minimum number of tiresome flight legs of the ii-th bird.

题目大意

nn 棵树排成一排,第 ii 棵树的高度是 did_i

qq 只鸟要从第 11 棵树到第 nn 棵树。

当第 ii 只鸟在第 jj 棵树时,它可以飞到第 j+1,j+2,,j+kij+1, j+2, \cdots, j+k_i 棵树。

如果一只鸟飞到一颗高度大于等于当前树的树,那么它的劳累值会增加 11,否则不会。

由于这些鸟已经体力不支,所以它们想要最小化劳累值。

输入格式

第一行输入 nn

第二行 nn 个数,第 ii 个数表示 did_i

第三行输入 qq

接下来 qq 行,每一行一个整数,第 ii 行的整数为 kik_i

输出格式

qq 行,每一行输出第 ii 只鸟的最小劳累值。

数据范围

1n1061 \le n \le 10^61di1091 \le d_i \le 10^91q251 \le q \le 251kin11 \le k_i \le n - 1

9
4 6 3 6 3 7 2 6 5
2
2
5

2
1