atcoder beginner contest 312 C题

题目链接：C - Invisible Hand

代码：

#include
using namespace std;
#define int long long
int n,m,a[4000005];
signed main()
{
	cin>>n>>m;
	for(int i=1;i<=n;i++)
	cin>>a[i];
	for(int i=1;i<=m;i++)
	cin>>a[n+i],++a[n+i];
	sort(a+1,a+n+1+m);
	cout<