Longest Increasing Subsequence

Problem Statement

Given a number sequence, find the length of its Longest Increasing Subsequence (LIS). In an increasing subsequence, all the elements are in increasing order (from lowest to highest).

Example 1:

Input: {4,2,3,6,10,1,12}
Output: 5
Explanation: The LIS is {2,3,6,10,12}.

Example 1:

Input: {-4,10,3,7,15}
Output: 4
Explanation: The LIS is {-4,3,7,15}.

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