Pretty simple using map!
See the Repl.it
#include <iostream>
#include <map>
int main()
{
int foo[]{1,1,1,1,4,6,4,7,4};
std::map<int, int> bar;
for (auto const &f : foo)
bar[f]++;
for (auto const &b : bar)
std::cout << "The number " << b.first
<< "is repeated " << b.second
<< "times\n";
}Expected output:
The number 1 is repeated 4 times
The number 4 is repeated 3 times
The number 6 is repeated 1 times
The number 7 is repeated 1 times