Language: C++

#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
using namespace std;

int main(){
  string N,K;
  cin >> N >> K;
  string S;
  cin >> S;
  vector<int> Numns;
  int now = 1;
  int cnt = 0;
  
  for(int i=0;i<N;i++){
    if(S[i]==(char)('0'+now)) cnt++;
    else{
      Nums.push_back(cnt);
      now=1-now;
      cnt=1;
    }
  }
  if(cnt!=0) Nums.push_back(cnt);
  if(Nums.size()%2==0) Nums.push_back(0)
  int Add=2*K+1;
  int ans=0;
  int left=0;
  int right=0;
  for(int i=0;i<Nums.size();i+=2){
    int tmp=0;
    int left=i;
    int right=i+Add;    
    for(int j=left;j<right;j++){
      tmp+=Nums[j];
    }
    ans=max(ans,tmp)
  }
	cout << ans<<endl;
}




Compiler output:
a.cc: In function 'int main()':
a.cc:16:16: error: no match for 'operator<' (operand types are 'int' and 'std::string' {aka 'std::__cxx11::basic_string<char>'})
   16 |   for(int i=0;i<N;i++){
      |               ~^~
      |               | |
      |               | std::string {aka std::__cxx11::basic_string<char>}
      |               int
In file included from /usr/include/c++/14/string:48,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_iterator.h:448:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  448 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:448:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
/usr/include/c++/14/bits/stl_iterator.h:493:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  493 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1694 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1760 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1045:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1045 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1045:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
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:673:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  673 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:673:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
/usr/include/c++/14/string_view:680:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  680 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:680:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
/usr/include/c++/14/string_view:688:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  688 |     operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:688:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   16 |   for(int i=0;i<N;i++){
      |                 ^
/usr/include/c++/14/bits/basic_string.h:3874:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3874 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
/usr/include/c++/14/bits/basic_string.h:3888:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3888 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
/usr/include/c++/14/bits/basic_string.h:3901:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3901 |     operator<(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3901:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const _CharT*' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2600:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator<(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2600 |     operator<(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2600:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const std::tuple<_UTypes ...>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
In file included from /usr/include/c++/14/vector:66,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_vector.h:2089:5: note: candidate: 'template<class _Tp, class _Alloc> bool std::operator<(const vector<_Tp, _Alloc>&, const vector<_Tp, _Alloc>&)'
 2089 |     operator<(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:2089:5: note:   template argument deduction/substitution failed:
a.cc:16:17: note:   mismatched types 'const std::vector<_Tp, _Alloc>' and 'int'
   16 |   for(int i=0;i<N;i++){
      |                 ^
In file included from /usr/include/c++/14/bits/ios_base.h:46:
/usr/include/c++/14/system_error:324:3: note: candidate: 'bool std::operator<(const error_code&, const error_code&)'
  324 |   operator<(const error_code& __lhs, const error_code& __rhs) noexcept
      |   ^~~~~~~~
/usr/include/c++/14/system_error:324:31: note:   no known conversion for argument 1 from 'int' to 'const std::error_code&'
  324 |   operator<(const error_code& __lhs, const error_code& __rhs) noexcept
      |             ~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/system_error:507:3: note: candidate: 'bool std::operator<(const error_condition&, const error_condition&)'
  507 |   operator<(const error_condition& __lhs,
      |   ^~~~~~~~
/usr/include/c++/14/system_error:507:36: note:   no known conversion for argument 1 from 'int' to 'const std::error_condition&'
  507 |   operator<(const error_condition& __lhs,
      |             ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
a.cc:19:7: error: 'Nums' was not declared in this scope; did you mean 'Numns'?
   19 |       Nums.push_back(cnt);
      |       ^~~~
      |       Numns
a.cc:24:14: error: 'Nums' was not declared in this scope; did you mean 'Numns'?
   24 |   if(cnt!=0) Nums.push_back(cnt);
      |              ^~~~
      |              Numns
a.cc:25:6: error: 'Nums' was not declared in this scope; did you mean 'Numns'?
   25 |   if(Nums.size()%2==0) Nums.push_back(0)
      |      ^~~~
      |      Numns
a.cc:30:17: error: 'Nums' was not declared in this scope; did you mean 'Numns'?
   30 |   for(int i=0;i<Nums.size();i+=2){
      |                 ^~~~
      |                 Numns
a.cc:33:17: error: 'Add' was not declared in this scope
   33 |     int right=i+Add;
      |                 ^~~
a.cc:37:21: error: expected ';' before '}' token
   37 |     ans=max(ans,tmp)
      |                     ^
      |                     ;
   38 |   }
      |   ~