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Need help solving this question. I know DP would be used but still, no idea. Thanx
Given an unsorted array on integers, find the length of its largest sub-sequence such that it is increasing at first and then decreasing and the number of elements in increasing and decreasing parts should be the same.
Input: 1 2 3 2 1 4 5 6 7 19 15 12 10 9 Output: 9
