导弹拦截

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
struct point{
    int l1,l2;
};
point p[100005];
bool cmp(point A,point B)
{
    return A.l1>B.l1;
}
int main()
{
    freopen("missile.in","r",stdin);
    freopen("missile.out","w",stdout);
    int  Ax,Bx,Ay,By,n,m1=0,m2=0;
    cin>>Ax>>Ay>>Bx>>By>>n;    
    for(int i=1;i<=n;i++)
    {
        int x,y;
        cin>>x>>y;
        p[i].l1=(x-Ax)*(x-Ax)+(y-Ay)*(y-Ay);
        p[i].l2=(x-Bx)*(x-Bx)+(y-By)*(y-By);
    }
    sort(p+1,p+1+n,cmp);
    int k1=p[1].l1,k2=0;
    int ans=k1+k2;
    for(int i=2;i<=n;i++)   
    {
        k1=p[i].l1 ;
           k2=max(p[i-1].l2,k2);
           ans=min(ans,k1+k2);
    }
    cout<<ans<<endl;
}