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#include<bits/stdc++.h>
using namespace std;
int compare(string X, string Y) 
{ 
    // first append Y at the end of X 
    string XY = X.append(Y); 
 
    // then append X at the end of Y 
    string YX = Y.append(X); 
 
    // Now see which of the two formed numbers is greater 
    return XY.compare(YX) > 0 ? 1: 0; 
} 
int main() {
	int t;
	cin>>t;
	while(t--){
        int n;
        cin>>n;
        int arr[100]; 
	for(int i = 0;i<n;i++){
		int b;
		cin>>b;
		arr[i]=to_string(b);
	}
	sort(arr,arr+n,compare);
	for(int i = 0;i<n;i++){
		cout<<arr[i];
	}
	cout<<endl;
	}
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:24:21: error: cannot convert ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} to ‘int’ in assignment
   arr[i]=to_string(b);
                     ^
In file included from /usr/include/c++/8/bits/stl_algobase.h:71,
                 from /usr/include/c++/8/bits/char_traits.h:39,
                 from /usr/include/c++/8/ios:40,
                 from /usr/include/c++/8/istream:38,
                 from /usr/include/c++/8/sstream:38,
                 from /usr/include/c++/8/complex:45,
                 from /usr/include/c++/8/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/8/bits/predefined_ops.h: In instantiation of ‘constexpr bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = int*; _Iterator2 = int*; _Compare = int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)]’:
/usr/include/c++/8/bits/stl_algo.h:1847:14:   required from ‘void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_algo.h:1885:25:   required from ‘void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_algo.h:1971:31:   required from ‘void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_algo.h:4866:18:   required from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = int*; _Compare = int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)]’
prog.cpp:26:24:   required from here
/usr/include/c++/8/bits/predefined_ops.h:143:18: error: could not convert ‘* __it1’ from ‘int’ to ‘std::__cxx11::basic_string<char>’
         { return bool(_M_comp(*__it1, *__it2)); }
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/8/bits/predefined_ops.h: In instantiation of ‘bool __gnu_cxx::__ops::_Iter_comp_val<_Compare>::operator()(_Iterator, _Value&) [with _Iterator = int*; _Value = int; _Compare = int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)]’:
/usr/include/c++/8/bits/stl_heap.h:133:48:   required from ‘void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare&) [with _RandomAccessIterator = int*; _Distance = long int; _Tp = int; _Compare = __gnu_cxx::__ops::_Iter_comp_val<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_heap.h:237:23:   required from ‘void std::__adjust_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = int*; _Distance = long int; _Tp = int; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_heap.h:342:22:   required from ‘void std::__make_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare&) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_algo.h:1672:23:   required from ‘void std::__heap_select(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_algo.h:1933:25:   required from ‘void std::__partial_sort(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_algo.h:1948:27:   required from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = int*; _Size = long int; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_algo.h:1968:25:   required from ‘void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)>]’
/usr/include/c++/8/bits/stl_algo.h:4866:18:   required from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = int*; _Compare = int (*)(std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>)]’
prog.cpp:26:24:   required from here
/usr/include/c++/8/bits/predefined_ops.h:177:11: error: could not convert ‘* __it’ from ‘int’ to ‘std::__cxx11::basic_string<char>’
  { return bool(_M_comp(*__it, __val)); }
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Standard output is empty