#P474E. Pillars

    ID: 250 远端评测题 1000ms 256MiB 尝试: 71 已通过: 7 难度: 9 上传者: 标签>binary searchdata structuresdpsortingstrees*2000

Pillars

Description

Marmot found a row with n pillars. The i-th pillar has the height of hi meters. Starting from one pillar i1, Marmot wants to jump on the pillars i2, ..., ik. (1 ≤ i1 < i2 < ... < ik ≤ n). From a pillar i Marmot can jump on a pillar j only if i < j and |hi - hj| ≥ 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.

题面翻译

  • 给定序列 aa,长度为 nn
  • 找出一个 aa 序列的子序列 bb(设其长度为 mm),使得
    • 对于任意的 1i<m1\le i<m,有 bi+1bid|b_{i+1}-b_i|\ge d
    • mm 最大。
    • 其中 dd 是给定的。
  • 您的程序要输出 mm 和序列 bb
  • 1n1051\le n\le 10^50d1090\le d\le 10^91ai10151\le a_i\le 10^{15}。若 bb 不唯一,输出任意一种。

Input

The first line contains two integers n and d (1 ≤ n ≤ 105, 0 ≤ d ≤ 109).

The second line contains n numbers h1, h2, ..., hn (1 ≤ hi ≤ 1015).

Output

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.

5 2
1 3 6 7 4
10 3
2 1 3 6 9 11 7 3 20 18
4
1 2 3 5
6
1 4 6 7 8 9

Note

In the first example Marmot chooses the pillars 1, 2, 3, 5 with the heights 1, 3, 6, 4. Another jump sequence of length 4 is 1, 2, 4, 5.