Language: C++

#include<iostream>
#include<string>
#include<string.h>
#include<stdio.h>
#include<algorithm>
#include<math.h>
#include<vector>
#include<queue>
#include<map>
#include<set>
using namespace std;
#define rep(i,a,b) for (i=a;i<=b;i++)
typedef long long ll;
#define maxd 1e9+7
int n;
multiset<LL> a,b;
struct node{
    int x,y;
}ball[200500];

int read()
{
    int x=0,f=1;char ch=getchar();
    while ((ch<'0') || (ch>'9')) {if (ch=='-') f=-1;ch=getchar();}
    while ((ch>='0') && (ch<='9')) {x=x*10+(ch-'0');ch=getchar();}
    return x*f;
}

ll query()
{
    return ((*a.rbegin()-*a.begin())*(*b.rbegin()-*b.begin()));
}

bool cmp(node p,node q)
{
    return ((p.x<q.x) && ((p.x==q.x) && (p.y<q.y)));
}

int main()
{
    n=read();int i;
    for (i=1;i<=n;i++)
    {
        ball[i].x=read();ball[i].y=read();
        if (ball[i].x>ball[i].y) swap(ball[i].x,ball[i].y);
        a.insert(ball[i].x);
        b.insert(ball[i].y);
    }
    ll ans=query();
    sort(ball+1,ball+1+n,cmp);
    for (i=1;i<=n;i++)
    {
        int nx=ball[i].x,ny=ball[i].y;
        a.erase(a.find(nx));b.erase(b.find(ny));
        a.insert(ny);b.insert(nx);
        ans=min(ans,query());
    }
    printf("%lld",ans);
    return 0;
}

Compiler output:
a.cc:16:10: error: 'LL' was not declared in this scope; did you mean 'll'?
   16 | multiset<LL> a,b;
      |          ^~
      |          ll
a.cc:16:12: error: template argument 1 is invalid
   16 | multiset<LL> a,b;
      |            ^
a.cc:16:12: error: template argument 2 is invalid
a.cc:16:12: error: template argument 3 is invalid
a.cc: In function 'll query()':
a.cc:31:17: error: request for member 'rbegin' in 'a', which is of non-class type 'int'
   31 |     return ((*a.rbegin()-*a.begin())*(*b.rbegin()-*b.begin()));
      |                 ^~~~~~
a.cc:31:29: error: request for member 'begin' in 'a', which is of non-class type 'int'
   31 |     return ((*a.rbegin()-*a.begin())*(*b.rbegin()-*b.begin()));
      |                             ^~~~~
a.cc:31:42: error: request for member 'rbegin' in 'b', which is of non-class type 'int'
   31 |     return ((*a.rbegin()-*a.begin())*(*b.rbegin()-*b.begin()));
      |                                          ^~~~~~
a.cc:31:54: error: request for member 'begin' in 'b', which is of non-class type 'int'
   31 |     return ((*a.rbegin()-*a.begin())*(*b.rbegin()-*b.begin()));
      |                                                      ^~~~~
a.cc: In function 'int main()':
a.cc:46:11: error: request for member 'insert' in 'a', which is of non-class type 'int'
   46 |         a.insert(ball[i].x);
      |           ^~~~~~
a.cc:47:11: error: request for member 'insert' in 'b', which is of non-class type 'int'
   47 |         b.insert(ball[i].y);
      |           ^~~~~~
a.cc:54:11: error: request for member 'erase' in 'a', which is of non-class type 'int'
   54 |         a.erase(a.find(nx));b.erase(b.find(ny));
      |           ^~~~~
a.cc:54:19: error: request for member 'find' in 'a', which is of non-class type 'int'
   54 |         a.erase(a.find(nx));b.erase(b.find(ny));
      |                   ^~~~
a.cc:54:31: error: request for member 'erase' in 'b', which is of non-class type 'int'
   54 |         a.erase(a.find(nx));b.erase(b.find(ny));
      |                               ^~~~~
a.cc:54:39: error: request for member 'find' in 'b', which is of non-class type 'int'
   54 |         a.erase(a.find(nx));b.erase(b.find(ny));
      |                                       ^~~~
a.cc:55:11: error: request for member 'insert' in 'a', which is of non-class type 'int'
   55 |         a.insert(ny);b.insert(nx);
      |           ^~~~~~
a.cc:55:24: error: request for member 'insert' in 'b', which is of non-class type 'int'
   55 |         a.insert(ny);b.insert(nx);
      |                        ^~~~~~