302462: CF474E. Pillars
Memory Limit:256 MB
Time Limit:1 S
Judge Style:Text Compare
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Description
Pillars
题意翻译
- 给定序列 $a$,长度为 $n$。 - 找出一个 $a$ 序列的子序列 $b$(设其长度为 $m$),使得 - 对于任意的 $1\le i<m$,有 $|b_{i+1}-b_i|\ge d$。 - $m$ 最大。 - 其中 $d$ 是给定的。 - 您的程序要输出 $m$ 和序列 $b$。 - $1\le n\le 10^5$,$0\le d\le 10^9$,$1\le a_i\le 10^{15}$。若 $b$ 不唯一,输出任意一种。题目描述
Marmot found a row with $ n $ pillars. The $ i $ -th pillar has the height of $ h_{i} $ meters. Starting from one pillar $ i_{1} $ , Marmot wants to jump on the pillars $ i_{2} $ , ..., $ i_{k} $ . ( $ 1<=i_{1}<i_{2}<...<i_{k}<=n $ ). From a pillar $ i $ Marmot can jump on a pillar $ j $ only if $ i<j $ and $ |h_{i}-h_{j}|>=d $ , where $ |x| $ is the absolute value of the number $ x $ . Now Marmot is asking you find out a jump sequence with maximal length and print it.输入输出格式
输入格式
The first line contains two integers n and d (1 ≤ n ≤ 10^5, 0 ≤ d ≤ 10^9). The second line contains n numbers h1, h2, ..., hn (1 ≤ hi ≤ 10^15).
输出格式
The first line should contain one integer k, the maximal length of a jump sequence. The second line should contain k integers i1, i2, ..., ik (1 ≤ i1 < i2 < ... < ik ≤ n), representing the pillars' indices from the maximal length jump sequence. If there is more than one maximal length jump sequence, print any.
输入输出样例
输入样例 #1
5 2
1 3 6 7 4
输出样例 #1
4
1 2 3 5
输入样例 #2
10 3
2 1 3 6 9 11 7 3 20 18
输出样例 #2
6
1 4 6 7 8 9