Codeforces Round #635 (Div. 2)D. Xenia and Colorful Gems

传说门
刚好今晚是中国场!
其实这道题比较水,但当时思路错,一心想着化简公式,浪费了好多时间a.a

题意:三个数组,求(x-y)(x-y)+(x-z)(x-z)+(y-z)*(y-z)的最小值

题解:6nlogn,先sort三个数组a,b,c, 六次枚举二分查找,再每次min找最小值,例如:先固定数组a,再在数组b,c中利用lower_bound找到第一个大于等于a[i]的数,

#pragma GCC optimize(2)
#include <bits/stdc++.h>
#define ll long long
#define endl  '\n'
using namespace std;
const int manx=1e5+5;

ll t,a1,b1,c1;
ll a[manx],b[manx],c[manx];
ll checks(ll a[],ll a1,ll b[],ll b1,ll c[],ll c1)
{
    ll add=2e18,x,y,z;
    for(int i=1; i<=a1; i++)
    {
        x=a[i];
        ll k=lower_bound(b+1,b+b1,x)-b;
        if(k>=1&&k<=b1&&b[k]>=x) //确保数组b中有比大于等于x的值
            y=b[k];
        else
            continue;
        ll l=lower_bound(c+1,c+c1,x)-c;
        if(l>=1&&l<=c1&&c[l]<=x)
            z=c[l];
        else
            continue;
            
        ll d=(y-z)*(y-z)+(x-y)*(x-y)+(x-z)*(x-z);
        add=min(add,d);
    }
    return add;
}
int main()
{
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
     t;
	cin>>t;
    while(t--)
    {
        cin>>a1;
        cin>>b1;
        cin>>c1;
        for(int i=1;i<=a1;i++)
            cin>>a[i];
        for(int i=1;i<=b1;i++)
            cin>>b[i];
        for(int i=1;i<=c1;i++)
            cin>>c[i];
        sort(a+1,a+1+a1);
        sort(b+1,b+1+b1);
        sort(c+1,c+1+c1);
        ll ans=2e18;
        ans=min(ans,checks(a,a1,b,b1,c,c1));ans=min(ans,checks(a,a1,c,c1,b,b1));
        ans=min(ans,checks(b,b1,a,a1,c,c1));ans=min(ans,checks(b,b1,c,c1,a,a1));
        ans=min(ans,checks(c,c1,b,b1,a,a1));ans=min(ans,checks(c,c1,a,a1,b,b1));
        cout<<ans<<endl;
    }
}
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