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This puzzle can be solved using the following concepts. Practice using these concepts and improve your skills.

Statement

 Goal

Find the length of the longest increasing subsequence in a list.

A subsequence is a sequence of numbers that can be derived from the original list by deleting some or all of the elements without changing the order of the remaining elements. An increasing subsequence is a subsequence in which the elements are in increasing order.

Example:

Input: [5, 2, 8, 6, 3, 6, 9, 7]
Output: 4

If you remove 5, 8 and 6 (the first one) you get the longest increasing subsequence ([2, 3, 6, 9] or [2, 3, 6, 7]), both of which have a length of 4.
Input
Line 1: An integer N for the size of the list
Next N lines: An integer P that is part of the list
Output
Line 1: An integer that represents the length of the longest increasing subsequence
Constraints
2 <= N <= 2568
Example
Input
8
5
2
8
6
3
6
9
7
Output
4

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