Language: C++

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

vector<vector<int>> to(200001);
vector<int> min_cost(200001, 200001);
vector<int> answer(200001);

void dfs(int mae, int x, int cost){
  if (cost >= min_cost.at(x)) return;
  else{
    min_cost.at(x) = cost;
    answer.at(x) = mae;
    rep(i, to.at(x).size()) dfs(x, to.at(x).at(i), cost + 1);
  }
}

int main() {
  int N, M;
  vector<int> A(200001), B(200001);
  map<int, int> miti;
  cin >> N >> M;
  rep(i, M) cin >> A.at(i) >> B.at(i);
  rep(i, M){
    to.at(A.at(i)).push_back(B.at(i));
    to.at(B.at(i)).push_back(A.at(i));
  }
  dfs(0, 1, 0);
  bool ok = true;
  for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
  if(ok){
    cout << "Yes" << endl;
    for (int i = 2; i <= N; i++){
    cout << answer.at(i) << endl;
  }
  else cout << "No" << endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:32:23: error: 'n' was not declared in this scope
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                       ^
a.cc:32:43: error: no match for 'operator==' (operand types are 'std::vector<int>' and 'int')
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                  ~~~~~~~~ ^~ ~~~~~~
      |                                  |           |
      |                                  |           int
      |                                  std::vector<int>
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:32:46: note:   'std::vector<int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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:32:46: note:   'std::vector<int>' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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:32:46: note:   'std::vector<int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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:32:46: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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:32:46: note:   'std::vector<int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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:32:46: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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:32:46: note:   'std::vector<int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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:32:46: note:   'std::vector<int>' is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
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:32:46: note:   'std::vector<int>' is not derived from 'const std::pair<_T1, _T2>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
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:32:46: note:   'std::vector<int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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:32:46: note:   'std::vector<int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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:32:46: note:   'std::vector<int>' is not derived from 'const std::move_iterator<_IteratorL>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
/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,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:32:46: note:   'std::vector<int>' is not derived from 'const std::move_iterator<_IteratorL>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
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,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:32:46: note:   'std::vector<int>' is not derived from 'const std::fpos<_StateT>'
   32 |   for (int i = 0; i < n; i++) if(min_cost == 200001) ok = false;
      |                                              ^~~~~~
In file included from /usr/include/c++/14/string:43:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)'
  235 |     operator==(const allocator<_T1>&, const allocator<_