PlusMinus

int n = arr.size();
int pos = 0, neg = 0;

for (auto it : arr) {
    if (it < 0) neg++;
    if (it > 0) pos++;
}

int zer = n - pos - neg;
cout << pos << '/' << n << endl;
cout << neg << '/' << n << endl;
cout << zer << '/' << n << endl;