Sereja and Pairs

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Sereja had an non-negative integer A in the range [0, 10100]. One day, he wrote N pairs of the form (X[i], floor(A / X[i]) ) on a piece of paper. Let us denote floor(A / X[i]) by D[i]. Sereja's little brother Sergey is very naughty, he changed the D values for some of the pairs. When confronted for his mischief by Sereja, he said that he did not touch more than K such pairs. Now, given the modi

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solution.cppC++17

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