Language: C++

#include <bits/stdc++.h>
using namespace::std;
#define int long long

#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sax(x) cout << "!!!!!!!!!!! " << #x << " = " << x << '\n'
#define inf (sizeof(int) == 4 ? (int)1E9 : (int)1E18)
#define one(x) x.insert(x.begin(), 0);
#define TCT template <class T>
#define TCT12 template <class T1, class T2>
#define IS istream
#define OS ostream
#define OP operator

//#include <ext/pb_ds/assoc_container.hpp>
//using namespace __gnu_pbds;
//typedef tree<int,null_type,less_equal<int>,rb_tree_tag,
//tree_order_statistics_node_update> imsi;

TCT IS& OP>>(IS &I, vector<T>& v) {for (T &e: v) I >> e; return I;}
TCT OS& OP<<(OS &O, const vector<T>& v) {for (const T &e: v) O << e << ' '; return O;}
TCT OS& OP<<(OS &O, const unordered_set<T>& v) {for (const T &e: v) O << e << ' '; return O;}
TCT OS& OP<<(OS &O, const set<T>& v) {for (const T &e: v) O << e << ' '; return O;}
TCT OS& OP<<(OS &O, const unordered_multiset<T>& v) {for (const T &e: v) O << e << ' '; return O;}
TCT OS& OP<<(OS &O, const multiset<T>& v) {for (const T &e: v) O << e << ' '; return O;}
TCT IS& OP>>(IS &I, deque<T>& v) {for (T &e: v) I >> e; return I;}
TCT OS& OP<<(OS &O, const deque<T>& v) {for (const T &e: v) O << e << ' '; return O;}
TCT OS& OP<<(OS &O, priority_queue<T> v) {while (!v.empty()) {O << v.top() << ' '; v.pop();} return O;}
TCT OS& OP<<(OS &O, stack<T> v) {while (!v.empty()) {O << v.top() << '\n'; v.pop();} return O;}
TCT OS& OP<<(OS &O, queue<T> v) {while (!v.empty()) {O << v.front() << ' '; v.pop();} return O;}
TCT12 IS& OP>>(IS &I, pair<T1,T2>& p) {return I >> p.first >> p.second;}
TCT12 OS& OP<<(OS &O, const pair<T1,T2>& p) {return O << '(' << p.first << ' ' << p.second << ')';}
TCT12 OS& OP<<(OS &O, const unordered_map<T1,T2>& v) {for (const auto &e: v) O << e << ' '; return O;}
TCT12 OS& OP<<(OS &O, const map<T1,T2>& v) {for (const auto &e: v) O << e << ' '; return O;}
typedef pair<int,int> pii;
typedef vector<int> vi;





void _main() {
        int a, b; cin >> a >> b;
        cout << 1 ^ 2 ^ 3 ^ a ^ b;
}



signed main() {
        ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
        int _t = 1;
//        cin >> _t;
        while (_t--) _main();
        return 0;
}


Compiler output:
a.cc: In function 'void _main()':
a.cc:45:19: error: no match for 'operator^' (operand types are 'std::basic_ostream<char>' and 'int')
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |         ~~~~~~~~~ ^ ~
      |              |      |
      |              |      int
      |              std::basic_ostream<char>
a.cc:45:19: note: candidate: 'operator^(int, int)' (built-in)
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |         ~~~~~~~~~~^~~
a.cc:45:19: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'int'
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bitset:1577:5: note: candidate: 'template<long unsigned int _Nb> std::bitset<_Nb> std::operator^(const bitset<_Nb>&, const bitset<_Nb>&)'
 1577 |     operator^(const bitset<_Nb>& __x, const bitset<_Nb>& __y) _GLIBCXX_NOEXCEPT
      |     ^~~~~~~~
/usr/include/c++/14/bitset:1577:5: note:   template argument deduction/substitution failed:
a.cc:45:21: note:   'std::basic_ostream<char>' is not derived from 'const std::bitset<_Nb>'
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |                     ^
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/bits/valarray_after.h:410:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__bitwise_xor, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__bitwise_xor, typename _Dom1::value_type>::result_type> std::operator^(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  410 |     _DEFINE_EXPR_BINARY_OPERATOR(^, struct std::__bitwise_xor)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
a.cc:45:21: note:   'std::basic_ostream<char>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |                     ^
/usr/include/c++/14/bits/valarray_after.h:410:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__bitwise_xor, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__bitwise_xor, typename _Dom1::value_type>::result_type> std::operator^(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  410 |     _DEFINE_EXPR_BINARY_OPERATOR(^, struct std::__bitwise_xor)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
a.cc:45:21: note:   'std::basic_ostream<char>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |                     ^
/usr/include/c++/14/bits/valarray_after.h:410:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__bitwise_xor, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__bitwise_xor, typename _Dom1::value_type>::result_type> std::operator^(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  410 |     _DEFINE_EXPR_BINARY_OPERATOR(^, struct std::__bitwise_xor)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
a.cc:45:21: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |                     ^
/usr/include/c++/14/bits/valarray_after.h:410:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__bitwise_xor, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__bitwise_xor, typename _Dom1::value_type>::result_type> std::operator^(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  410 |     _DEFINE_EXPR_BINARY_OPERATOR(^, struct std::__bitwise_xor)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
a.cc:45:21: note:   'std::basic_ostream<char>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |                     ^
/usr/include/c++/14/bits/valarray_after.h:410:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__bitwise_xor, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__bitwise_xor, typename _Dom1::value_type>::result_type> std::operator^(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  410 |     _DEFINE_EXPR_BINARY_OPERATOR(^, struct std::__bitwise_xor)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
a.cc:45:21: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |                     ^
/usr/include/c++/14/valarray:1201:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__bitwise_xor, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__bitwise_xor, _Tp>::result_type> std::operator^(const valarray<_Tp>&, const valarray<_Tp>&)'
 1201 | _DEFINE_BINARY_OPERATOR(^, __bitwise_xor)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1201:1: note:   template argument deduction/substitution failed:
a.cc:45:21: note:   'std::basic_ostream<char>' is not derived from 'const std::valarray<_Tp>'
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |                     ^
/usr/include/c++/14/valarray:1201:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__bitwise_xor, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__bitwise_xor, _Tp>::result_type> std::operator^(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1201 | _DEFINE_BINARY_OPERATOR(^, __bitwise_xor)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1201:1: note:   template argument deduction/substitution failed:
a.cc:45:21: note:   'std::basic_ostream<char>' is not derived from 'const std::valarray<_Tp>'
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |                     ^
/usr/include/c++/14/valarray:1201:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__bitwise_xor, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__bitwise_xor, _Tp>::result_type> std::operator^(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1201 | _DEFINE_BINARY_OPERATOR(^, __bitwise_xor)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1201:1: note:   template argument deduction/substitution failed:
a.cc:45:21: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
   45 |         cout << 1 ^ 2 ^ 3 ^ a ^ b;
      |                     ^
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:41:
/usr/include/c++/14/cstddef:146:3: note: candidate: 'constexpr std::byte std::operator^(byte, byte)'
  146 |   operator^(byte __l, byte __r) noexcept
      |   ^~~~~~~~
/usr/include/c++/14/cstddef:146:18: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'std::byte'
  146 |   operator^(byte __l, byte __r) noexcept
      |             ~~~~~^~~
In file included from /usr/include/c++/14/streambuf:43,
                 from /usr/include/c++/14/bits/streambuf_iterator.h:35,
                 from /usr/include/c++/14/iterator:66,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:54:
/usr/include/c++/14/bits/ios_base.h:94:3: note: candidate: 'constexpr std::_Ios_Fmtflags std::operator^(_Ios_Fmtflags, _Ios_Fmtflags)'
   94 |   operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b) _GLIBCXX_NOTHROW
      |   ^~~~~~~~
/usr/include/c++/14/bits/ios_base.h:94:27: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'std::_Ios_Fmtflags'
   94 |   operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b) _GLIBCXX_NOTHROW
      |             ~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/ios_base.h:144:3: note: candidate: 'constexpr std::_Ios_Openmode std::operator^(_Ios_Openmode, _Ios_Openmode)'
  144 |   operator^(_Ios_Openmode __a, _Ios_Openmode __b) _GLIBCXX_NOTHROW
      |   ^~~~~~~~
/usr/include/c++/14/bits/ios_base.h:144:27: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'std::_Ios_Openmode'
  144 |   operator^(_Ios_Openmode __a, _Ios_Openmode __b) _GLIBCXX_NOTHROW
      |             ~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/ios_base.h:191:3: note: candidate: 'constexpr std::_Ios_Iostate std::operator^(_Ios_Iostate, _Ios_Iostate)'
  191 |   operator^(_Ios_Iostate __a, _Ios_Iostate __b) _GLIBCXX_NOTHROW
      |   ^~~~~~~~
/usr/include/c++/14/bits/ios_base.h:191:26: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'std::_Ios_Iostate'
  191 |   operator^(_Ios_Iostate __a, _Ios_Iostate __b) _GLIBCXX_NOTHROW
      |             ~~~~~~~~~~~~~^~~
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:176:
/usr/include/c++/14/future:170:20: note: candidate: 'constexpr std::launch std::operator^(launch, launch)'
  170 |   constexpr launch operator^(launch __x, launch __y) noexcept
      |                    ^~~~~~~~
/usr/include/c++/14/future:170:37: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'std::launch'
  170 |   constexpr launch operator^(launch __x, launch __y) noexcept
      |                              ~~~~~~~^~~
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:198:
/usr/include/c++/14/charconv:637:3: note: candidate: 'constexpr std::chars_format std::operator^(chars_format, chars_format)'
  637 |   operator^(chars_format __lhs, chars_format __rhs) noexcept
      |   ^~~~~~~~
/usr/include/c++/14/charconv:637:26: note