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#include<iostream>
#include<unordered_map>
#include<algorithm>
using namespace std;
 
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        int n;
        cin >>n;
        long long int * arr = new long long int [n];
 
        unordered_map<long long int ,int> mymap ;
 
        for(int i=0;i<n;i++)
        {
            cin>>arr[i];
            //pair<long long int ,int> p ;
            //p.first=arr[i];
            //p.second = i;
            //mymap.insert(p);
        }
        sort(arr,arr+n);
        bool flag = 0;
        int start = 0;
        int last = n-1 ;
        long long int searcs;
        while(start<last)
        {
            searcs = arr[start] * arr[last] ;
            if(searcs>arr[n-1])
                    last--;
            else if(searcs<arr[0])
                start++;
            /*else
            {
            auto ans = mymap.find(searcs);
            if(ans!=mymap.end())
                {
                flag= 1;
                break;
                }
            }*/
        }
 
            pair<long long int ,int> p ;
 		for (int i=start;i<=last;i++){
 			p.first=arr[i];
            p.second = i;
 			mymap.insert(p);
    	}
 
    	/*while(start<last)
        {
            searcs = arr[start] * arr[last] ;
            if(searcs>arr[n-1])
                    last--;
            else if(searcs<arr[0])
                start++;*/
            //else
            //{
            auto ans = mymap.find(searcs);
            if(ans!=mymap.end())
                {
                flag= 1;
                break;
                }
            }
 
 
        if(flag)
                cout<<"yes"<<endl;
        else
        cout<<"no"<<endl;
 
 
    }
return 0;
}
 

In file included from /usr/include/c++/5/unordered_map:35:0,
                 from prog.cpp:2:
/usr/include/c++/5/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support for the \
  ^
prog.cpp: In function 'int main()':
prog.cpp:16:9: error: 'unordered_map' was not declared in this scope
         unordered_map<long long int ,int> mymap ;
         ^
prog.cpp:16:23: error: expected primary-expression before 'long'
         unordered_map<long long int ,int> mymap ;
                       ^
prog.cpp:53:5: error: 'mymap' was not declared in this scope
     mymap.insert(p);
     ^
prog.cpp:65:18: error: 'ans' does not name a type
             auto ans = mymap.find(searcs);
                  ^
prog.cpp:66:16: error: 'ans' was not declared in this scope
             if(ans!=mymap.end())
                ^
prog.cpp:66:21: error: 'mymap' was not declared in this scope
             if(ans!=mymap.end())
                     ^
prog.cpp:74:12: error: 'flag' was not declared in this scope
         if(flag)
            ^
prog.cpp: At global scope:
prog.cpp:81:1: error: expected unqualified-id before 'return'
 return 0;
 ^
prog.cpp:82:1: error: expected declaration before '}' token
 }
 ^

Standard output is empty