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Longest Increasing Subsequence Arrays
Longest Increasing Subsequence Arrays
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I decide to quit my coding career after trying this problem...
The time limit for this problem is no reasonable.
You have to do everything perfectly correct to not get a TLE.
Well, if you are talking about calculating ncr then you should take a look at this : https://www.geeksforgeeks.org/compute-ncr-p-set-3-using-fermat-little-theorem/
Not really. The
ncris the key to get accepted. Not because it's hard, the truth is you have to cache the factorials and the inverse element of these factorials to make thencrefficient enough.Is that really necessary? Why not relaxing the time limit to make us happy? haha
This is quite a tough problem. Can this be solved using DP ?
can anyone give sone hints
I do not expect [1,1,2,1] to be a valid array if the elements are to be in increasing order!. Can someone clarify this?
It is valid untill you can find a subsequence in increasing order. In your example it is still possible to select {1,2} subsequence from array. The invalid array will be [2,1,1,1], because there is no "1" before "2", so you can't select increasing subsequence.