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#include <iostream>
using namespace std;
template <typename F>
int count(int * a, int * b, int na, int nb, F const& pred) {
int x = 0;
for (int i = 0; i < na; i++)
for (int j = 0; j < nb; j++)
if (pred(a[i], b[j])) x++;
return x;
}
int main() {
int a[3] = { 1, 3, 31 };
int b[2] = { 13, 2 };
int n1 = count(a, b, 3, 2, [](int a, int b) -> int {
return a - b == 1 || a - b == -1;
});
int n2 = count(a, b, 3, 2, [](int a, int b) -> int {
return a % 10 == b / 10 && a / 10 == b % 10;
});
cout << n1 << endl;
cout << n2 << endl;
}
