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NGON (many polygons) on SPOJ
I am trying to solve NGON problem. I am using bottom up dynamic programming here. Recurrence function is:
$$\begin{array}{rl}
f(a,b) &= f(a-1,b) + f(a-1,b-1)\,a_i +\frac{f(a-1,b-2)\,a_i(a_i-1)...
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