RTP ProgComp 2018.5.26

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2018-05-26 16:35 UTC

RTP ProgComp 2018.5.26

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2018-05-26 19:35 UTC
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Problem H
Increasing Subsequence

A strictly increasing sequence is a sequence of numbers $a_1, a_2, \ldots , a_ n$ such that, for $1 < i \le n$, $a_{i-1} < a_ i$. A subsequence of $a_1, a_2, \ldots , a_ n$ is identified by a strictly increasing sequence of indices, $x_1, x_2, \ldots , x_ m$ where $1 \leq x_1$ and $x_ m \leq n$. We say $a_{x_1}, a_{x_2}, \ldots , a_{x_ m}$ is a subsequence of $a_1, a_2, \ldots , a_ n$. For example, given the sequence $8, 90, 4, 10\, 000, 2, 18, 60, 172, 99$, we can say that $90, 4, 10\, 000, 18$ is a subsequence but $8, 90, 18, 2, 60$ is not. The subsequence $4, 18, 60, 172$ is a subsequence that is, itself, strictly increasing.

Given a sequence of numbers, can you write a program to find a strictly increasing subsequence that is as long as possible?

Input

Input has up to $200$ test cases, one per line. Each test case starts with an integer $1 \le n \le 200$, followed by $n$ integer values, all in the range $[0,10^8]$. A value of zero for $n$ marks the end of input.

Output

For each test case, output the length of the longest strictly increasing subsequence, followed the values of the lexicographically-earliest such sequence. A sequence $a_1, a_2, \ldots , a_ m$ is lexicographically earlier than $b_1, b_2, \ldots , b_ m$ if some $a_ i < b_ i$ and $a_ j = b_ j$ for all $j < i$.

Sample Input 1 Sample Output 1
4 1 25 2 3
4 1 2 2 3
8 90 4 10000 2 18 60 172 99
0
3 1 2 3
3 1 2 3
4 2 18 60 99