Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using ll = long long;
using P = pair<int,int>;

int main(){
  int n;
  cin >> n;

  vector<int> l(n);
  rep(i,n) cin >> l[i];
  int ans =0;

  rep(i,n)rep(j,n)rep(k,n){
    if(i < j && j < k){
        if(l[i] == l[j]) continue;
        if(l[i] == l[k]) continue;
        if(l[k] == l[j]) continue;

        if((ll)l[i]+l[j]+l[k] <= max({l[i],l[j],l[k]}) *2) continue;
     ans++;
     }
  }
  cout << ans << endl;
  return 0;

}




Compiler output:
a.cc:4:11: error: 'pair' does not name a type
    4 | using P = pair<int,int>;
      |           ^~~~
a.cc: In function 'int main()':
a.cc:8:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |   cin >> n;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:10:3: error: 'vector' was not declared in this scope
   10 |   vector<int> l(n);
      |   ^~~~~~
a.cc:10:3: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:10:10: error: expected primary-expression before 'int'
   10 |   vector<int> l(n);
      |          ^~~
a.cc:11:19: error: 'l' was not declared in this scope
   11 |   rep(i,n) cin >> l[i];
      |                   ^
a.cc:16:12: error: 'l' was not declared in this scope
   16 |         if(l[i] == l[j]) continue;
      |            ^
a.cc:17:12: error: 'l' was not declared in this scope
   17 |         if(l[i] == l[k]) continue;
      |            ^
a.cc:18:12: error: 'l' was not declared in this scope
   18 |         if(l[k] == l[j]) continue;
      |            ^
a.cc:20:16: error: 'l' was not declared in this scope
   20 |         if((ll)l[i]+l[j]+l[k] <= max({l[i],l[j],l[k]}) *2) continue;
      |                ^
a.cc:20:34: error: 'max' was not declared in this scope; did you mean 'std::max'?
   20 |         if((ll)l[i]+l[j]+l[k] <= max({l[i],l[j],l[k]}) *2) continue;
      |                                  ^~~
      |                                  std::max
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: 'std::max' declared here
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
a.cc:24:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   24 |   cout << ans << endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:24:18: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   24 |   cout << ans << endl;
      |                  ^~~~
      |                  std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~