Language: C++

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Numerics;
using static System.Console;

namespace CSharpTest
{
    static class Program
    {
        static Dictionary<int, BigInteger>[] memo;

        static BigInteger Count(int N, int K, int[] A)
        {
            if (memo[N].TryGetValue(K, out var v)) 
            {
                return v;
            }
            if (N == 0)
            {
                if (A[0] <= K)
                {
                    memo[N][K] = 2;
                }
                else
                {
                    memo[N][K] = 1;
                }
            }
            else if (K >= A[N]) 
            {
                memo[N][K] = Count(N - 1, K - A[N], A) + Count(N - 1, K, A);
            }
            else
            {
                memo[N][K] = Count(N - 1, K, A);
            }
            return memo[N][K];
        }

        static void Main(string[] args)
        {
            var N = int.Parse(ReadLine());
            var A = ReadLine().Split(' ').Select(s => int.Parse(s)).OrderBy(i => i).ToArray();
            memo = new Dictionary<int, BigInteger>[N];
            for(var i = 0; i < N; ++i)
            {
                memo[i] = new Dictionary<int, BigInteger>();
            }
            var min = 0;
            var max = 2000000;
            var target = BigInteger.Pow(2, N - 1) + 1;
            while (max - min > 1) 
            {
                var mid = (min + max) / 2;
                if (Count(N - 1, mid, A) >= target)
                {
                    max = mid;
                }
                else
                {
                    min = mid;
                }
            }
            WriteLine(max);
        }
    }
}


Compiler output:
a.cc:1:7: error: expected nested-name-specifier before 'System'
    1 | using System;
      |       ^~~~~~
a.cc:2:7: error: expected nested-name-specifier before 'System'
    2 | using System.Collections.Generic;
      |       ^~~~~~
a.cc:3:7: error: expected nested-name-specifier before 'System'
    3 | using System.Linq;
      |       ^~~~~~
a.cc:4:7: error: expected nested-name-specifier before 'System'
    4 | using System.Text;
      |       ^~~~~~
a.cc:5:7: error: expected nested-name-specifier before 'System'
    5 | using System.Threading.Tasks;
      |       ^~~~~~
a.cc:6:7: error: expected nested-name-specifier before 'System'
    6 | using System.Numerics;
      |       ^~~~~~
a.cc:7:7: error: expected nested-name-specifier before 'static'
    7 | using static System.Console;
      |       ^~~~~~
a.cc:13:16: error: 'Dictionary' does not name a type
   13 |         static Dictionary<int, BigInteger>[] memo;
      |                ^~~~~~~~~~
a.cc:15:16: error: 'BigInteger' does not name a type
   15 |         static BigInteger Count(int N, int K, int[] A)
      |                ^~~~~~~~~~
a.cc:43:26: error: 'string' has not been declared
   43 |         static void Main(string[] args)
      |                          ^~~~~~
a.cc:43:35: error: expected ',' or '...' before 'args'
   43 |         static void Main(string[] args)
      |                                   ^~~~
a.cc:69:6: error: expected ';' after class definition
   69 |     }
      |      ^
      |      ;
a.cc: In static member function 'static void CSharpTest::Program::Main(int*)':
a.cc:45:13: error: 'var' was not declared in this scope
   45 |             var N = int.Parse(ReadLine());
      |             ^~~
a.cc:46:17: error: expected ';' before 'A'
   46 |             var A = ReadLine().Split(' ').Select(s => int.Parse(s)).OrderBy(i => i).ToArray();
      |                 ^
a.cc:47:13: error: 'memo' was not declared in this scope
   47 |             memo = new Dictionary<int, BigInteger>[N];
      |             ^~~~
a.cc:47:24: error: 'Dictionary' does not name a type
   47 |             memo = new Dictionary<int, BigInteger>[N];
      |                        ^~~~~~~~~~
a.cc:47:35: error: expected primary-expression before 'int'
   47 |             memo = new Dictionary<int, BigInteger>[N];
      |                                   ^~~
a.cc:48:21: error: expected ';' before 'i'
   48 |             for(var i = 0; i < N; ++i)
      |                     ^
a.cc:48:28: error: 'i' was not declared in this scope
   48 |             for(var i = 0; i < N; ++i)
      |                            ^
a.cc:48:32: error: 'N' was not declared in this scope
   48 |             for(var i = 0; i < N; ++i)
      |                                ^
a.cc:50:31: error: 'Dictionary' does not name a type
   50 |                 memo[i] = new Dictionary<int, BigInteger>();
      |                               ^~~~~~~~~~
a.cc:50:42: error: expected primary-expression before 'int'
   50 |                 memo[i] = new Dictionary<int, BigInteger>();
      |                                          ^~~
a.cc:52:17: error: expected ';' before 'min'
   52 |             var min = 0;
      |                 ^~~
a.cc:53:17: error: expected ';' before 'max'
   53 |             var max = 2000000;
      |                 ^~~
a.cc:54:17: error: expected ';' before 'target'
   54 |             var target = BigInteger.Pow(2, N - 1) + 1;
      |                 ^~~~~~
a.cc:55:20: error: 'max' was not declared in this scope
   55 |             while (max - min > 1)
      |                    ^~~
a.cc:55:26: error: 'min' was not declared in this scope
   55 |             while (max - min > 1)
      |                          ^~~
a.cc:57:21: error: expected ';' before 'mid'
   57 |                 var mid = (min + max) / 2;
      |                     ^~~
a.cc:58:27: error: 'N' was not declared in this scope
   58 |                 if (Count(N - 1, mid, A) >= target)
      |                           ^
a.cc:58:34: error: 'mid' was not declared in this scope
   58 |                 if (Count(N - 1, mid, A) >= target)
      |                                  ^~~
a.cc:58:39: error: 'A' was not declared in this scope
   58 |                 if (Count(N - 1, mid, A) >= target)
      |                                       ^
a.cc:58:21: error: 'Count' was not declared in this scope
   58 |                 if (Count(N - 1, mid, A) >= target)
      |                     ^~~~~
a.cc:58:45: error: 'target' was not declared in this scope
   58 |                 if (Count(N - 1, mid, A) >= target)
      |                                             ^~~~~~
a.cc:67:23: error: 'max' was not declared in this scope
   67 |             WriteLine(max);
      |                       ^~~
a.cc:67:13: error: 'WriteLine' was not declared in this scope
   67 |             WriteLine(max);
      |             ^~~~~~~~~
a.cc: At global scope:
a.cc:11:5: error: a storage class can only be specified for objects and functions
   11 |     static class Program
      |     ^~~~~~