Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using ll = long long;
const ll M = 1e9 + 7;

int main() {
  int n;
  cin >> n;
  vector<ll> a(n);
  rep(i,n) cin >> a[i];

  // case1
  bool flag = true;
  rep(i,n) {
    if (a[i] != 0) {
      flag = false;
      break;
    }
  }

  if (flag){
    cout << "Yes" << endl;
    return 0;
  }

  // case2
  int c_0 = 0;
  set<ll> s;
  rep(i,n){
    if (a[i] == 0) {
      c_0++;
      continue;
    }
    s.insert(a[i]);
  }    
  if (c_0 == n/3 && n%3 == 0 && s.size() == 1) {
    cout << "Yes" << endl;
    return 0;
  }

  // case3
  vector<pair<ll,ll>> v;
  set<ll> r;
  rep(i,n){
    if (r.count(a[i])) {
      rep(j,v.size()) if (v[j].first == a[i]) {
        v[j].second++;
        break;
      }
    }
    r.insert(a[i]);
    v.push_back(make_pair(a[i],0));
    if (r.size() > 3) {
      cout << "No" << endl;
      return 0;
    }
  }  

  if (r.size() != 3) {
    cout << "No" << endl;
    return 0;
  }

  if ((v[0].second == v[1].second) && (v[1].second == v[2].second)){
    if (v[0].first ^ v[1].first ^ v[2].first == 0){
      if (v[0].second == v[1].second && v[1].second == v[2].second ){
        if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
          cout << "Yes" << endl;
          return 0;
        }
      }
    }
  }

  cout << "No" << endl;
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:68:80: error: no match for 'operator!=' (operand types are 'long long int' and '__gnu_cxx::__alloc_traits<std::allocator<std::pair<long long int, long long int> >, std::pair<long long int, long long int> >::value_type' {aka 'std::pair<long long int, long long int>'})
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:1:
/usr/include/c++/14/bits/regex.h:1132:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator!=(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1132 |     operator!=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1132:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/regex.h:1212:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator!=(__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const sub_match<_BiIter>&)'
 1212 |     operator!=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1212:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/regex.h:1305:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator!=(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1305 |     operator!=(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1305:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/regex.h:1379:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1379 |     operator!=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1379:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<long long int, long long int> >, std::pair<long long int, long long int> >::value_type' {aka 'std::pair<long long int, long long int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/regex.h:1473:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1473 |     operator!=(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1473:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/regex.h:1547:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1547 |     operator!=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1547:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<long long int, long long int> >, std::pair<long long int, long long int> >::value_type' {aka 'std::pair<long long int, long long int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/regex.h:1647:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1647 |     operator!=(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1647:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/regex.h:2213:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator!=(const match_results<_BiIter, _Alloc>&, const match_results<_BiIter, _Alloc>&)'
 2213 |     operator!=(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:2213:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::__cxx11::match_results<_BiIter, _Alloc>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_pair.h:1052:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator!=(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1052 |     operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1052:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::pair<_T1, _T2>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:455:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  455 |     operator!=(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:455:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/stl_iterator.h:500:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  500 |     operator!=(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:500:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/stl_iterator.h:1686:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1686 |     operator!=(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1686:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
/usr/include/c++/14/bits/stl_iterator.h:1753:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1753 |     operator!=(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1753:5: note:   template argument deduction/substitution failed:
a.cc:68:86: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'long long int'
   68 |         if (v[0].first != v[1].first && v[1].first != v[2].first && v[2].first != v[0]){
      |                                                                                      ^
In file included from /usr/include/c++/14/bits/char_traits.h:42,
                 from /usr/include/c++/14/string:42,
                 from /usr/include/c++/14/bitset:52,