通用解法:
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main()
{
int a[5] = { 1,2,3,4,5 };
int b[5] = { 2,4,5,6,7 };
vector<int>res(a, a + 5);
for (auto i : b)
res.push_back(i);
sort(res.begin(), res.end());
int mid = res.size() / 2;
cout << res[mid];
system("pause");
return 0;
}