four numbers mock bdoi 2019 pari nai

PHOTO EMBED

Wed Nov 25 2020 01:54:07 GMT+0000 (UTC)

Saved by @Shami_Al #c++

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef long double ld;
ll cs=0;
struct duo
{
    ld x,F,S;
};
bool sim(duo a,duo b)
{
    if(a.F==b.F||a.F==b.S||a.S==b.F||a.S==b.S)
        return 1;
    return 0;
}
void sol()
{
    cout.precision(11);
    cout<<fixed;
    ll n,i,k;
    cin>>n;
    ld a[n],vl,ans=0;
    duo low[3],h[3];
    for(i=0; i<3; i++)
        low[i].x=INT_MAX;
    for(i=0; i<n; i++)
        cin>>a[i];
    sort(a,a+n);
    for(i=0; i<3; i++)
    {
        h[i].F=a[n-1-i];
        h[i].S=a[n-2-i];
    }
    for(i=0; i<n-1; i++)
    {
        vl=abs(a[i]-a[i+1]);
        for(k=0; k<3; k++)
        {
            if(vl<low[k].x)
            {
                ll j=k;
                for(j=2; j>=k+1; j--)
                {
                    low[j].x=low[j-1].x;
                    low[j].F=low[j-1].F;
                    low[j].S=low[j-1].S;
                }
                low[k].x=vl;
                low[k].F=a[i];
                low[k].S=a[i+1];
                break;
            }
        }
    }
    for(i=0;i<3;i++)
    {
        for(k=0;k<3;k++)
        {
            if(!sim(h[i],low[k]))
                ans=fmax(ans,(h[i].F+h[i].S)/low[k].x);
        }
    }
    cout<<ans;

}
int main()
{
    //ios_base::sync_with_stdio(false);
    //cin.tie(NULL);
    //ll t;
    //cin>>t;
    //while(t--)
    sol();
    return 0;
}
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