hi all... i gotsome problems.. I don't understand what it means at all...

"write a function pread that reads in n pairs of coeffients and exponents, 0<=i<n

of a polynomial, x. assume that expon i+1 > expon i, 0<=i<n-2, and that coef i != 0, 0<=i < n. show that this operation can be peformed in O(n) time!!!"

I really confuseeeeeeeeeeee... HELP!!