Language: C++

x	#include <bits/stdc++.h>
#define N (int)2e6
using namespace std;

int x;
int n;
vector <int> a, v;

bool cmp (const int &x, const int &y) {
	return x > y;
}
int main () {
	cin >> x;
	n = 1 << x;
	for (int i = 1; i <= n; i ++) {
		int y;
		cin >> y;
		a.push_back (y);
	}
	
	sort (a.begin (), a.end (), cmp);
	
	v.push_back (a[0]);
	a.erase (a.begin ());
	int t = 1;
	while (t <= x) {
		vector <int> tmp;
		for (int i = 0; i < v.size (); i ++) {
			vector <int> :: iterator it = upper_bound (a.begin (), a.end (), v[i], cmp);
			if (it == a.end ()) {
				cout << "No" << endl;
				return 0;
			}
//			cout << *it << endl;
			tmp.push_back (*it);
			a.erase (it);
		}
		for (int i = 0; i < tmp.size (); i ++) {
			v.push_back (tmp[i]);
		}
		t ++;
	}
	
	cout << "Yes" << endl;
	return 0;
}

Compiler output:
a.cc:1:9: error: stray '#' in program
    1 | x       #include <bits/stdc++.h>
      |         ^
a.cc:1:1: error: 'x' does not name a type
    1 | x       #include <bits/stdc++.h>
      | ^
a.cc:7:1: error: 'vector' does not name a type
    7 | vector <int> a, v;
      | ^~~~~~
a.cc: In function 'int main()':
a.cc:13:9: error: 'cin' was not declared in this scope
   13 |         cin >> x;
      |         ^~~
a.cc:18:17: error: 'a' was not declared in this scope
   18 |                 a.push_back (y);
      |                 ^
a.cc:21:15: error: 'a' was not declared in this scope
   21 |         sort (a.begin (), a.end (), cmp);
      |               ^
a.cc:21:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   21 |         sort (a.begin (), a.end (), cmp);
      |         ^~~~
      |         short
a.cc:23:9: error: 'v' was not declared in this scope
   23 |         v.push_back (a[0]);
      |         ^
a.cc:27:17: error: 'vector' was not declared in this scope
   27 |                 vector <int> tmp;
      |                 ^~~~~~
a.cc:27:25: error: expected primary-expression before 'int'
   27 |                 vector <int> tmp;
      |                         ^~~
a.cc:29:33: error: expected primary-expression before 'int'
   29 |                         vector <int> :: iterator it = upper_bound (a.begin (), a.end (), v[i], cmp);
      |                                 ^~~
a.cc:30:29: error: 'it' was not declared in this scope; did you mean 'i'?
   30 |                         if (it == a.end ()) {
      |                             ^~
      |                             i
a.cc:31:33: error: 'cout' was not declared in this scope
   31 |                                 cout << "No" << endl;
      |                                 ^~~~
a.cc:31:49: error: 'endl' was not declared in this scope
   31 |                                 cout << "No" << endl;
      |                                                 ^~~~
a.cc:35:25: error: 'tmp' was not declared in this scope; did you mean 'cmp'?
   35 |                         tmp.push_back (*it);
      |                         ^~~
      |                         cmp
a.cc:35:41: error: 'it' was not declared in this scope; did you mean 'i'?
   35 |                         tmp.push_back (*it);
      |                                         ^~
      |                                         i
a.cc:38:37: error: 'tmp' was not declared in this scope; did you mean 'cmp'?
   38 |                 for (int i = 0; i < tmp.size (); i ++) {
      |                                     ^~~
      |                                     cmp
a.cc:44:9: error: 'cout' was not declared in this scope
   44 |         cout << "Yes" << endl;
      |         ^~~~
a.cc:44:26: error: 'endl' was not declared in this scope
   44 |         cout << "Yes" << endl;
      |                          ^~~~