Language: C++

#include<bits/stdc++.h>
#define MAX 100005
using namespace std;
 
int main(){
  int n, a, b;
  long long k;
  map<int, long long> m;
  scanf("%d%lld", &n, &k);
  for(int i = 0; i < n; i++){
    scanf("%d%d", &a, &b);
    if(m.find(a) == m.end()) m[a] = b;
    else m[a] += b;
  }
  map<int, int>::iterator it;
  for(it = m.begin(); it != m.end(); it++){
    pair<int, long long> p = *it;
    k -= p.second;
    if(k <= 0){
      printf("%d\n", p.first); 
      break;
    }
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:20: error: no match for 'operator=' (operand types are 'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} and 'std::map<int, long long int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, long long int>, std::_Select1st<std::pair<const int, long long int> >, std::less<int>, std::allocator<std::pair<const int, long long int> > >::iterator'})
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                    ^
In file included from /usr/include/c++/14/map:62,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:152,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_tree.h:252:12: note: candidate: 'constexpr std::_Rb_tree_iterator<std::pair<const int, int> >& std::_Rb_tree_iterator<std::pair<const int, int> >::operator=(const std::_Rb_tree_iterator<std::pair<const int, int> >&)'
  252 |     struct _Rb_tree_iterator
      |            ^~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_tree.h:252:12: note:   no known conversion for argument 1 from 'std::map<int, long long int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, long long int>, std::_Select1st<std::pair<const int, long long int> >, std::less<int>, std::allocator<std::pair<const int, long long int> > >::iterator'} to 'const std::_Rb_tree_iterator<std::pair<const int, int> >&'
/usr/include/c++/14/bits/stl_tree.h:252:12: note: candidate: 'constexpr std::_Rb_tree_iterator<std::pair<const int, int> >& std::_Rb_tree_iterator<std::pair<const int, int> >::operator=(std::_Rb_tree_iterator<std::pair<const int, int> >&&)'
/usr/include/c++/14/bits/stl_tree.h:252:12: note:   no known conversion for argument 1 from 'std::map<int, long long int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, long long int>, std::_Select1st<std::pair<const int, long long int> >, std::less<int>, std::allocator<std::pair<const int, long long int> > >::iterator'} to 'std::_Rb_tree_iterator<std::pair<const int, int> >&&'
a.cc:16:26: error: no match for 'operator!=' (operand types are 'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} and 'std::map<int, long long int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, long long int>, std::_Select1st<std::pair<const int, long long int> >, std::less<int>, std::allocator<std::pair<const int, long long int> > >::iterator'})
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                       ~~ ^~ ~~~~~~~
      |                       |          |
      |                       |          _Rb_tree_iterator<pair<[...],long long int>>
      |                       _Rb_tree_iterator<pair<[...],int>>
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181:
/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:16:35: note:   'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                                   ^
/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:16:35: note:   'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                                   ^
/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:16:35: note:   'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                                   ^
/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:16:35: note:   'std::map<int, long long int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, long long int>, std::_Select1st<std::pair<const int, long long int> >, std::less<int>, std::allocator<std::pair<const int, long long int> > >::iterator'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                                   ^
/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:16:35: note:   'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                                   ^
/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:16:35: note:   'std::map<int, long long int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, long long int>, std::_Select1st<std::pair<const int, long long int> >, std::less<int>, std::allocator<std::pair<const int, long long int> > >::iterator'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                                   ^
/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:16:35: note:   'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                                   ^
/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:16:35: note:   'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   16 |   for(it = m.begin(); it != m.end(); it++){
      |                                   ^
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:16:35: note:   'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} is not derived from 'const std::pair<_T1, _T2>'
   16 |   for(it = m.begin();