Viewing profile — nabb

Also working on pairs of consecutive fibonacci numbers (f_n, f_(n+1)) instead of the matrix [[f_(n+1) f_n] [f_n f_(n-1)]] makes this much simpler. def fib(n): def fib2(n): # return…

An easy way to do the second is to consider the sum and the sum of squares. This gets you a-b and a^2-b^2. Recall that the latter is (a-b)(a+b) and the answer follows immediately.

I'd add TopCoder and Codeforces to the list: http://community.topcoder.com/tc http://codeforces.com/ Both of these sites run a few algorithm competitions every month.

The introduction was alright, but I'm not sure that the hold buffer needs to be introduced straight away. Using the hold buffer can get complicated pretty quickly, and it isn't som…

tail can be done in ruby can be quite succinctly with the $ ruby -e'$> For the rest of the ruby one-liners in the page the author references, most can be done more easily with stan…