Additional test cases have been added.
I like this solution ! Simple and easy to read.
it took me quite a while to figure this one out.your coding thought keep stunning me.amazing idea!
Using forward&backward compare,don't see that before,awesome.
Find the sum of all the numbers of the input vector
Getting the indices from a vector
Create a matrix X, where each column is a shifted copy of the vector v
Pi Estimate 1
Given a matrix, swap the 2nd & 3rd columns
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