Language: C++

int main(void){
    int N, K; cin >> N >> K;
    vector<ll> x(N), y(N);
    for(int i=0; i<N; i++) cin >> x[i] >> y[i];

    ll ans = (1LL<<62);
    for(int i=0; i<N; i++){
        for(int j=0; j<N; j++){
            for(int k=0; k<N; k++){
                for(int l=0; l<N; l++){
                    ll x1 = x[i], x2 = x[j];
                    ll y1 = y[k], y2 = y[l];
                    int cnt = 0;
                    if(x2 <= x1 || y2 <= y1) continue;
                    for(int m=0; m<N; m++){
                        if(x1<=x[m] && x[m]<=x2 && y1<=y[m] && y[m]<=y2) cnt++;
                    }
                    if(cnt>=K) ans = min(ans, (x2-x1)*(y2-y1));
                }
            }
        }
    }

    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:2:15: error: 'cin' was not declared in this scope
    2 |     int N, K; cin >> N >> K;
      |               ^~~
a.cc:3:5: error: 'vector' was not declared in this scope
    3 |     vector<ll> x(N), y(N);
      |     ^~~~~~
a.cc:3:12: error: 'll' was not declared in this scope
    3 |     vector<ll> x(N), y(N);
      |            ^~
a.cc:3:16: error: 'x' was not declared in this scope
    3 |     vector<ll> x(N), y(N);
      |                ^
a.cc:3:22: error: 'y' was not declared in this scope
    3 |     vector<ll> x(N), y(N);
      |                      ^
a.cc:6:7: error: expected ';' before 'ans'
    6 |     ll ans = (1LL<<62);
      |       ^~~~
      |       ;
a.cc:11:23: error: expected ';' before 'x1'
   11 |                     ll x1 = x[i], x2 = x[j];
      |                       ^~~
      |                       ;
a.cc:12:23: error: expected ';' before 'y1'
   12 |                     ll y1 = y[k], y2 = y[l];
      |                       ^~~
      |                       ;
a.cc:14:24: error: 'x2' was not declared in this scope
   14 |                     if(x2 <= x1 || y2 <= y1) continue;
      |                        ^~
a.cc:14:30: error: 'x1' was not declared in this scope
   14 |                     if(x2 <= x1 || y2 <= y1) continue;
      |                              ^~
a.cc:14:36: error: 'y2' was not declared in this scope
   14 |                     if(x2 <= x1 || y2 <= y1) continue;
      |                                    ^~
a.cc:14:42: error: 'y1' was not declared in this scope
   14 |                     if(x2 <= x1 || y2 <= y1) continue;
      |                                          ^~
a.cc:16:28: error: 'x1' was not declared in this scope
   16 |                         if(x1<=x[m] && x[m]<=x2 && y1<=y[m] && y[m]<=y2) cnt++;
      |                            ^~
a.cc:16:46: error: 'x2' was not declared in this scope
   16 |                         if(x1<=x[m] && x[m]<=x2 && y1<=y[m] && y[m]<=y2) cnt++;
      |                                              ^~
a.cc:16:52: error: 'y1' was not declared in this scope
   16 |                         if(x1<=x[m] && x[m]<=x2 && y1<=y[m] && y[m]<=y2) cnt++;
      |                                                    ^~
a.cc:16:70: error: 'y2' was not declared in this scope
   16 |                         if(x1<=x[m] && x[m]<=x2 && y1<=y[m] && y[m]<=y2) cnt++;
      |                                                                      ^~
a.cc:18:32: error: 'ans' was not declared in this scope
   18 |                     if(cnt>=K) ans = min(ans, (x2-x1)*(y2-y1));
      |                                ^~~
a.cc:18:48: error: 'x2' was not declared in this scope
   18 |                     if(cnt>=K) ans = min(ans, (x2-x1)*(y2-y1));
      |                                                ^~
a.cc:18:51: error: 'x1' was not declared in this scope
   18 |                     if(cnt>=K) ans = min(ans, (x2-x1)*(y2-y1));
      |                                                   ^~
a.cc:18:56: error: 'y2' was not declared in this scope
   18 |                     if(cnt>=K) ans = min(ans, (x2-x1)*(y2-y1));
      |                                                        ^~
a.cc:18:59: error: 'y1' was not declared in this scope
   18 |                     if(cnt>=K) ans = min(ans, (x2-x1)*(y2-y1));
      |                                                           ^~
a.cc:18:38: error: 'min' was not declared in this scope; did you mean 'main'?
   18 |                     if(cnt>=K) ans = min(ans, (x2-x1)*(y2-y1));
      |                                      ^~~
      |                                      main
a.cc:24:5: error: 'cout' was not declared in this scope
   24 |     cout << ans << endl;
      |     ^~~~
a.cc:24:13: error: 'ans' was not declared in this scope
   24 |     cout << ans << endl;
      |             ^~~
a.cc:24:20: error: 'endl' was not declared in this scope
   24 |     cout << ans << endl;
      |                    ^~~~