Longest Repeated subsequence

Write a program that takes a sequence of number and returns length of the longest repeated
subsequence. A repeated subsequence which repeats identically at least K times without overlaps.
For example 1 2 3 1 2 3 2 3 1 repeats 2 3 for three times.

Line 1: The input contains a single integer T , the number of test cases.
Line 2: Two space-separated integers: N and K (1 <= n <= 50000), (2 <= k <= n)
Lines 3..N+2: N integers, one per line. The integer is between 0 and 10^9.
It is guaranteed that at least one subsequence is repeated at least K times.

For each test case, the first line print the length n of the Longest Repeated Subsequence and the line 2…n+1 print the subsequence numbers.(if we have several subsequence with the same length output the lexicographic order smallest one). Separate output for adjacent cases with a single blank line.

1
8 2
1
2
3
2
3
2
3
1

2
2
3

2009 Multi-University Training Contest 9 - Host by HIT