Language: C++

#include <bits/stdc++.h>
#define FOR(i, a, n) for(int (i) = (int)(a); (i) < (int)(n); ++(i))
#define FORe(i, a, n) for(int (i) = (int)(a); (i) <= (int)(n); ++(i))
#define rFOR(i, a, n) for(int (i) = (int)(n)-1; (i) >= (int)(a); --(i))
#define REP(i, n) FOR((i), 0, (n))
#define REPe(i, n) FORe((i), 0, (n))
#define rREP(i, n) rFOR((i), 0, (n))
#define rep(i, n) FOR((i), 0, (n))
#define all(v) (v).begin(), (v).end()
using namespace std;
using ll = long long;
using P = pair<int,int>;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

int c[3][3];

int main() {
  REP(i, 3) REP(j, 3) cin >> c[i][j];
  if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
    cout << "Yes" << endl;
  }else cout << "No" << endl;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:29: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |      ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
a.cc:21:54: warning: capture of variable 'c' with non-automatic storage duration
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                      ^
a.cc:17:5: note: 'int c [3][3]' declared here
   17 | int c[3][3];
      |     ^
a.cc:21:55: error: expected ',' before '[' token
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                       ^
      |                                                       ,
a.cc:21:55: error: expected identifier before '[' token
a.cc: In lambda function:
a.cc:21:78: error: expected '{' before ')' token
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
a.cc: In function 'int main()':
a.cc:21:51: error: no match for 'operator==' (operand types are 'bool' and 'main()::<lambda()>')
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                             |                       |
      |                             bool                    main()::<lambda()>
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:1103:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1103 |     operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1103:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/regex.h:1199:5: 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>&)'
 1199 |     operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1199:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/regex.h:1274:5: 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>&)'
 1274 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1274:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/regex.h:1366:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1366 |     operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1366:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   'main()::<lambda()>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/regex.h:1441:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1441 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1441:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/regex.h:1534:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1534 |     operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1534:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   'main()::<lambda()>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/regex.h:1613:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1613 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1613:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/regex.h:2186:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator==(const match_results<_BiIter, _Alloc>&, const match_results<_BiIter, _Alloc>&)'
 2186 |     operator==(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:2186:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'const std::__cxx11::match_results<_BiIter, _Alloc>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
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:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'const std::pair<_T1, _T2>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:21:78: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'bool'
   21 |   if(c[0][0]+c[1][1]+c[2][2]==c[0][1]+c[1][2]+c[2]==[c[0][2]+c[1][0]+c[2][1]]) {
      |                                                                              ^
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |