Operations on polynomials (on cp-algorithms)

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Hi there!

During preparation of Oleksandr Kulkov Contest 1 I started writing some template for polynomial algebra (because 3 problems in contest in one or another way required some polynomial operations). And with great pleasure I'd like to report that it resulted in this article on cp-algorithms.com (English translation for e-maxx) and this mini-library containing all mentioned operations and algorithms (except for Half-GCD algorithm). I won't say the code is super-optimized, but at least it's public, provides some baseline and is open for contribution if anyone would like to enhance it!

Article also provides some algorithms I didn't mention before. Namely:

Interpolation: Now the described algorithm is $\text{[math]}$ and not $\text{[math]}$ as it was before.
Resultant: Given polynomials A(x) and B(x) compute product of A(μ_i) across all μ_i being roots of B(x).
Half-GCD: How to compute GCD and resultants in $\text{[math]}$ (just key ideas).