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B.cpp
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B.cpp
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//#pragma GCC optimize "trapv"
#pragma GCC optimize("Ofast")
#pragma GCC optimize("O3", "unroll-loops")
#pragma GCC target("avx,avx2,fma")
#include<bits/stdc++.h>
#define ll long long int
#define fab(a,b,i) for(int i=a;i<b;i++)
#define pb push_back
#define db double
#define mp make_pair
#define endl "\n"
#define f first
#define se second
#define all(x) x.begin(),x.end()
#define MOD 1000000007
#define vll vector<ll>
#define vi vector<int>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define quick ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
ll add(ll x, ll y) {ll res = x + y; return (res >= MOD ? res - MOD : res);}
ll mul(ll x, ll y) {ll res = x * y; return (res >= MOD ? res % MOD : res);}
ll sub(ll x, ll y) {ll res = x - y; return (res < 0 ? res + MOD : res);}
ll power(ll x, ll y) {ll res = 1; x %= MOD; while (y) {if (y & 1)res = mul(res, x); y >>= 1; x = mul(x, x);} return res;}
ll mod_inv(ll x) {return power(x, MOD - 2);}
using namespace std;
int main()
{ quick;
#ifndef ONLINE_JUDGE
freopen("D:/sublime/input.txt", "r", stdin);
freopen("D:/sublime/output.txt", "w", stdout);
#endif
int t;
cin>>t;
while(t--)
{
int n;
cin>>n;
ll a[n];
vector<ll> pos,neg;
fab(0,n,i)
{
cin>>a[i];
if(a[i]>=0)
pos.pb(a[i]);
else
neg.pb(a[i]);
}
sort(all(pos), greater<ll> ());
sort(all(neg));
ll ans=-1e18+8;
fab(0,6,i)
{
if(neg.size()<i or pos.size()<5-i)
continue;
ll prod=1;
if (i%2==1)
{
fab(0,5-i,j)
prod*=(pos[pos.size()-1-j]);
fab(0,i,j)
{
prod*=(neg[neg.size()-1-j]);
}
}
else
{
fab(0,5-i,j)
prod*=(pos[j]);
//cout<<"pp:"<<prod<<endl;
fab(0,i,j)
{
//cout<<
prod*=(neg[j]);
}
}
//cout<<"i:"<<i<<" " <<prod<<endl;
ans=max(ans,prod);
}
cout<<ans<<endl;
}
cerr << "time taken : " << (float)clock() / CLOCKS_PER_SEC << " secs" << endl;
return 0;
}