Language: C++

#include <bits/stdc++.h>
#include <vector>
#include <list>
#include <string.h>
using namespace std;
#define rep(i,n) for(int i=0; i<n; i++)



void solve(){
  int n,k;
  cin >> n >> k;
  string s;
  cin >> s;
  int c=s.length();
  
  int second;

  list<int> lst;
  int i=0;
  char c0or1 = '0';
  int j=0;
  if(s[0]=='1'){
  while(i<c){
	if(s[i]==c0or1){
      j++;
    }
    else{
      if(i!=0) j++;
      lst.push_back(j);
      if(c0or1=='0') c0or1 = '1';
      else c0or1 = '0';
      j=0;
    }
    i++;
  }
  lst.push_back(j+1);
  }
  else{
      while(i<c){
        if(i==0) j--;
	if(s[i]==c0or1){
      j++;
    }
    else{
      j++;
      lst.push_back(j);
      if(c0or1=='0') c0or1 = '1';
      else c0or1 = '0';
      j=0;
    }
    i++;
  }
  lst.push_back(j+1);
  }
  
  //cout << list[0] << list[1] << list[2] << list[3] << endl;
  
  for(int j=0; j<k; j++){
  int tmp = lst[0];
  int num=0;
  second = lst[0]+lst[1];
  for(int i=1; i<(lst.size()+1)/2; i++){
    if(lst[2*i]>tmp) {
      tmp=lst[2*i];
      num=i;
      second=lst[2*i-1]+lst[2*i]+lst[2*i+1];
    }
    if(lst[2*i]==tmp){
      if(second < lst[2*i-1]+lst[2*i]+lst[2*i+1]) {
        tmp=lst[2*i];
        num=i;
        second=lst[2*i-1]+lst[2*i]+lst[2*i+1];
      }
    }
  }
  
  
 if(num!=0){
   lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
   lst.insert(lst.begin()+2*num-2, second);
 }
  else{
   lst.erase(lst.begin()+2*num, lst.begin()+2*num+1);
   lst.insert(lst.begin()+2*num-2, second);
  }
  
  //cout << list[0] << " " << list[1] << " " << list[2] << endl;
  //cout << tmp << " " << num << " " << second << endl; 
    
  }
  
  cout << second << endl;
  
  
  
  
}

int main(){
  solve();
  return 0;
}
  


Compiler output:
a.cc: In function 'void solve()':
a.cc:60:16: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   60 |   int tmp = lst[0];
      |                ^
a.cc:62:15: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   62 |   second = lst[0]+lst[1];
      |               ^
a.cc:62:22: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   62 |   second = lst[0]+lst[1];
      |                      ^
a.cc:64:11: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   64 |     if(lst[2*i]>tmp) {
      |           ^
a.cc:65:14: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   65 |       tmp=lst[2*i];
      |              ^
a.cc:67:17: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   67 |       second=lst[2*i-1]+lst[2*i]+lst[2*i+1];
      |                 ^
a.cc:67:28: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   67 |       second=lst[2*i-1]+lst[2*i]+lst[2*i+1];
      |                            ^
a.cc:67:37: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   67 |       second=lst[2*i-1]+lst[2*i]+lst[2*i+1];
      |                                     ^
a.cc:69:11: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   69 |     if(lst[2*i]==tmp){
      |           ^
a.cc:70:22: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   70 |       if(second < lst[2*i-1]+lst[2*i]+lst[2*i+1]) {
      |                      ^
a.cc:70:33: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   70 |       if(second < lst[2*i-1]+lst[2*i]+lst[2*i+1]) {
      |                                 ^
a.cc:70:42: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   70 |       if(second < lst[2*i-1]+lst[2*i]+lst[2*i+1]) {
      |                                          ^
a.cc:71:16: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   71 |         tmp=lst[2*i];
      |                ^
a.cc:73:19: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   73 |         second=lst[2*i-1]+lst[2*i]+lst[2*i+1];
      |                   ^
a.cc:73:30: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   73 |         second=lst[2*i-1]+lst[2*i]+lst[2*i+1];
      |                              ^
a.cc:73:39: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<int>' and 'int')
   73 |         second=lst[2*i-1]+lst[2*i]+lst[2*i+1];
      |                                       ^
a.cc:80:25: error: no match for 'operator+' (operand types are 'std::__cxx11::list<int>::iterator' and 'int')
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |              ~~~~~~~~~~~^~~~~~
      |                       |   |
      |                       |   int
      |                       std::__cxx11::list<int>::iterator
In file included from /usr/include/c++/14/bits/stl_algobase.h:67,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_iterator.h:627:5: note: candidate: 'template<class _Iterator> constexpr std::reverse_iterator<_Iterator> std::operator+(typename reverse_iterator<_Iterator>::difference_type, const reverse_iterator<_Iterator>&)'
  627 |     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:627:5: note:   template argument deduction/substitution failed:
a.cc:80:28: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |                            ^~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note: candidate: 'template<class _Iterator> constexpr std::move_iterator<_IteratorL> std::operator+(typename move_iterator<_IteratorL>::difference_type, const move_iterator<_IteratorL>&)'
 1798 |     operator+(typename move_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note:   template argument deduction/substitution failed:
a.cc:80:28: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |                            ^~~
In file included from /usr/include/c++/14/string:54,
                 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/basic_string.h:3598:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3598 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3598:5: note:   template argument deduction/substitution failed:
a.cc:80:28: note:   'std::__cxx11::list<int>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |                            ^~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3616 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note:   template argument deduction/substitution failed:
a.cc:80:28: note:   mismatched types 'const _CharT*' and 'std::_List_iterator<int>'
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |                            ^~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3635 |     operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note:   template argument deduction/substitution failed:
a.cc:80:28: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |                            ^~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3652 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note:   template argument deduction/substitution failed:
a.cc:80:28: note:   'std::__cxx11::list<int>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |                            ^~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
 3670 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note:   template argument deduction/substitution failed:
a.cc:80:28: note:   'std::__cxx11::list<int>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |                            ^~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3682 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note:   template argument deduction/substitution failed:
a.cc:80:28: note:   'std::__cxx11::list<int>::iterator' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |                            ^~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3689 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note:   template argument deduction/substitution failed:
a.cc:80:28: note:   'std::__cxx11::list<int>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   80 |    lst.erase(lst.begin()+2*num-1, lst.begin()+2*num+1);
      |                            ^~~
/usr/include/c++/14/bits/basic_string.h:3696:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3696 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,