Help. Counting the fraction more repeats in two vectors

Greetings, I have a great doubt wish to have the most common fraction, knowing which are the numerators and denominators on a table in another.
#include <vector>
vector <long long int> nume;
vector <long long int> deno;

DEN 1 1 1 2 1
NUM 1 2 2 5 2

Would result 3 since 1/2 can be constructed three times. You can not use decimal divide and work must be done on both vectors efficiently.
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