- 描述
- We are given a sequence of N positive integers a = [a1, a2, ..., aN] on which we can perform contraction operations.

One contraction operation consists of replacing adjacent elements ai and ai+1 by their difference ai-a_{i+1}. For a sequence of N integers, we can perform exactly N-1 different contraction operations, each of which results in a new (N-1) element sequence.

Precisely, let con(a,i) denote the (N-1) element sequence obtained from [a1, a2, ..., aN] by replacing the elements ai and a_{i+1} by a single integer ai-a_{i+1} :

**con(a,i) = [a1, ..., ai-1, ai-a**_{i+1}, a_{i+2}, ..., aN]

Applying N-1 contractions to any given sequence of N integers obviously yields a single integer.

For example, applying contractions 2, 3, 2 and 1 in that order to the sequence [12,10,4,3,5] yields 4, since :

con([12,10,4,3,5],2) = [12,6,3,5]

con([12,6,3,5] ,3) = [12,6,-2]

con([12,6,-2] ,2) = [12,8]

con([12,8] ,1) = [4]

Given a sequence a1, a2, ..., aN and a target number T, the problem is to find a sequence of N-1 contractions that applied to the original sequence yields T.
- 输入
- The first line of the input contains two integers separated by blank character : the integer N, 1 <= N <= 100, the number of integers in the original sequence, and the target integer T, -10000 <= T <= 10000.

The following N lines contain the starting sequence : for each i, 1 <= i <= N, the (i+1)^{st} line of the input file contains integer ai, 1 <= ai <= 100.

- 输出
- Output should contain N-1 lines, describing a sequence of contractions that transforms the original sequence into a single element sequence containing only number T. The ith line of the output file should contain a single integer denoting the i
^{th} contraction to be applied.

You can assume that at least one such sequence of contractions will exist for a given input.

- 样例输入
5 4
12
10
4
3
5

- 样例输出
2
3
2
1

- 来源
- CEOI 1998