Longest Increasing SubSequence O(NLogN)[C++] added

[aditalware]

Fixes #488

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[lgtm-com[bot]]

This pull request introduces 1 alert when merging 0a4f2611d768a4f8715d858b13c3985dacb62801 into ec6e1a2a33ece9427ce8217aa72cb5a541397ea4 - view on LGTM.com

new alerts:

• 1 for Expression has no effect

[theyashshahs]

@aditalware please do not add other issues' commits on this PR, create a separate PR for that changes