Mistake at cpbook-code/ch3/dp/LIS.cpp about cpbook-code HOT 2 CLOSED

Hi git-hub-tig,

-. top-down or bottom-up is just preference, I prefer top-down, so will remain top-down in CP4 :).
-. I now notice the bug with {5,4,3,2,1} on the very old O(n^2) that was never tested again after I use O(n log k) version all these time, thanks for catching this. I have now changed ans = 0; to ans = 1; before the recursive case to fix this case without resorting to ensure that i==0 is the minimum, i.e., LIS can now start from any index and just end at n-1 that is set to have "INF" (very large number).
-. I have tested {5,4,3,2,1,99 (need last number = "INF")} -> returns 2 of course, and now test this code with many random tc.
-. I push a newer file, pls stress test it again

from cpbook-code.

issue closed, this should be fixed already

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