Language: C++

#pragma GCC optimize("O3")
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include<bits/stdc++.h>
using namespace std;
#define int long long
//#define d  long double
//#define d long double
#define pii pair<int,int>
#define pb push_back
#define N 200003
#define inf (int)1e18
#define haha ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

 
signed main()
{
    haha
   int n,m1;
   cin>>n>>m1;
   int f=0;
   map<int,int> m;
   int arr[n];
   memset(arr,0,sizeof(arr));
   int p=0;
   set<int> s;
   if(m==0 && n==1)
   {
       cout<<0;
       return 0;
   }
   if(m==0 && n>1)
   {
       cout<<-1;
       return 0;
   }
   for(int i=0;i<m1;i++)
   {
       int x,y;
       cin>>x>>y;
       if(x==1 && y==0 && n>1)
       f=1;
       if(x==1)
       p=1;
       if(s.find(x)!=s.end())
       {
           if(m[x]!=y)
           f=1;
       }
       else
       {
       m[x]=y;
       s.insert(x);
       }
       arr[x-1]=y;
   }
   if(p==0)
   f=1;
   if(f==1)
   cout<<-1;
   else
   {
       int x=0;
       for(int i=n-1;i>=0;i--)
       {
           x+=arr[i]*pow(10,(n-1-i));
       }
      cout<<x;
   }
   
    
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:28:8: error: no match for 'operator==' (operand types are 'std::map<long long int, long long int>' and 'int')
   28 |    if(m==0 && n==1)
      |       ~^~~
      |       |  |
      |       |  int
      |       std::map<long long int, long long 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:5:
/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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   28 |    if(m==0 && n==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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   28 |    if(m==0 && n==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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   28 |    if(m==0 && n==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:28:10: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   28 |    if(m==0 && n==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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   28 |    if(m==0 && n==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:28:10: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   28 |    if(m==0 && n==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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   28 |    if(m==0 && n==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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   28 |    if(m==0 && n==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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::pair<_T1, _T2>'
   28 |    if(m==0 && n==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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   28 |    if(m==0 && n==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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   28 |    if(m==0 && n==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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::move_iterator<_IteratorL>'
   28 |    if(m==0 && n==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,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::move_iterator<_IteratorL>'
   28 |    if(m==0 && n==1)
      |          ^
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:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::fpos<_StateT>'
   28 |    if(m==0 && n==1)
      |          ^
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<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:235:5: note:   template argument deduction/substitution failed:
a.cc:28:10: note:   'std::map<long long int, long long int>' is not derived from 'const std::allocator<_CharT>'
   28 |    if(m==0 && n==1)
      |          ^
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:629:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  629 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:629:5: note:   template argument deduction/substitution failed:
a.cc:28:10: note:   'std::map<long long int, long long int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   28 |    if(m==0 && n==1)
      |          ^
/usr/include/c++/14/string_view:637:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  637 |     operator==(basic_string_view<_CharT, _Traits> __x,