Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
	int N, K, minx = 0, miny = 0;
	cin >> N >> K;
	K--;
	vector <__int64> x(N);
	vector <__int64> y(N);
	for (int i = 0; i < N; i++) {
		cin >> x[i] >> y[i];
	}
	sort(x.begin(), x.end());
	sort(y.begin(), y.end());

	//最小の範囲を取る
	for (int i = 0; i < N - K; i++) {
		if ((unsigned __int64)x[minx + K] - x[minx] > (unsigned __int64)x[i + K] - x[i])
			minx = i;
		if ((unsigned __int64)y[miny + K] - y[miny] > (unsigned __int64)y[i + K] - y[i])
			miny = i;
	}

	cout << ( (unsigned __int64)x[minx + K] - x[minx] ) *( (unsigned  __int64)y[miny + K] - y[miny] )<< endl;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:17: error: '__int64' was not declared in this scope; did you mean '__int64_t'?
   10 |         vector <__int64> x(N);
      |                 ^~~~~~~
      |                 __int64_t
a.cc:10:24: error: template argument 1 is invalid
   10 |         vector <__int64> x(N);
      |                        ^
a.cc:10:24: error: template argument 2 is invalid
a.cc:11:24: error: template argument 2 is invalid
   11 |         vector <__int64> y(N);
      |                        ^
a.cc:13:25: error: invalid types 'int[int]' for array subscript
   13 |                 cin >> x[i] >> y[i];
      |                         ^
a.cc:13:33: error: invalid types 'int[int]' for array subscript
   13 |                 cin >> x[i] >> y[i];
      |                                 ^
a.cc:15:16: error: request for member 'begin' in 'x', which is of non-class type 'int'
   15 |         sort(x.begin(), x.end());
      |                ^~~~~
a.cc:15:27: error: request for member 'end' in 'x', which is of non-class type 'int'
   15 |         sort(x.begin(), x.end());
      |                           ^~~
a.cc:16:16: error: request for member 'begin' in 'y', which is of non-class type 'int'
   16 |         sort(y.begin(), y.end());
      |                ^~~~~
a.cc:16:27: error: request for member 'end' in 'y', which is of non-class type 'int'
   16 |         sort(y.begin(), y.end());
      |                           ^~~
a.cc:20:22: error: expected primary-expression before 'unsigned'
   20 |                 if ((unsigned __int64)x[minx + K] - x[minx] > (unsigned __int64)x[i + K] - x[i])
      |                      ^~~~~~~~
a.cc:20:22: error: expected ')' before 'unsigned'
   20 |                 if ((unsigned __int64)x[minx + K] - x[minx] > (unsigned __int64)x[i + K] - x[i])
      |                     ~^~~~~~~~
      |                      )
a.cc:21:33: error: expected ')' before ';' token
   21 |                         minx = i;
      |                                 ^
      |                                 )
a.cc:20:20: note: to match this '('
   20 |                 if ((unsigned __int64)x[minx + K] - x[minx] > (unsigned __int64)x[i + K] - x[i])
      |                    ^
a.cc:22:22: error: expected primary-expression before 'unsigned'
   22 |                 if ((unsigned __int64)y[miny + K] - y[miny] > (unsigned __int64)y[i + K] - y[i])
      |                      ^~~~~~~~
a.cc:22:22: error: expected ')' before 'unsigned'
   22 |                 if ((unsigned __int64)y[miny + K] - y[miny] > (unsigned __int64)y[i + K] - y[i])
      |                     ~^~~~~~~~
      |                      )
a.cc:23:33: error: expected ')' before ';' token
   23 |                         miny = i;
      |                                 ^
      |                                 )
a.cc:22:20: note: to match this '('
   22 |                 if ((unsigned __int64)y[miny + K] - y[miny] > (unsigned __int64)y[i + K] - y[i])
      |                    ^
a.cc:26:20: error: expected primary-expression before 'unsigned'
   26 |         cout << ( (unsigned __int64)x[minx + K] - x[minx] ) *( (unsigned  __int64)y[miny + K] - y[miny] )<< endl;
      |                    ^~~~~~~~
a.cc:26:20: error: expected ')' before 'unsigned'
   26 |         cout << ( (unsigned __int64)x[minx + K] - x[minx] ) *( (unsigned  __int64)y[miny + K] - y[miny] )<< endl;
      |                   ~^~~~~~~~
      |                    )
a.cc:26:113: error: expected ')' before ';' token
   26 |         cout << ( (unsigned __int64)x[minx + K] - x[minx] ) *( (unsigned  __int64)y[miny + K] - y[miny] )<< endl;
      |                 ~                                                                                               ^
      |                                                                                                                 )