Language: C++

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
struct YPO
{
    int a;
    int b;
};
int main()
{
    struct YPO c[100050];
    int n,k,a[100050];
    struct YPO b[100050],h=0,g,t=0;
    scanf("%d%d",&n,&k);
    int i,j,ci=0;
    for(i=0;i<n;i++)
        scanf("%1d",&a[i]);

    for(i=0;i<n;i++)
    {
        if(a[i]==1)
        {
            for(j=i;j<n&&a[j]==1;j++);
            b[h].a=i;
            b[h].b=j-1;
            h++;
            i=j;
        }
    }
    int ct;
    g=h-1;
    if(b[0].a!=0&&b[h-1].b==n-1)
    {
        g++;
        for(i=0;i<g;i++)
        {
            if(i==0)
                c[i].a=0;
            else
                c[i].a=b[i-1].b;
            c[i].b=b[i].b;
        }
    }
    else
        if(b[0].a==0&&b[h-1].b!=n-1)
    {
        g++;
        for(i=0;i<g;i++)
        {
            c[i].a=b[i].a;
            if(i==g-1)
                c[i].b=n-1;
            else
                c[i].b=b[i+1].b;
        }

    }
    else
        if(b[0].a!=0&&b[h-1].b!=n-1)
    {
        g=g+2;
        for(i=0;i<g;i++)
        {
            if(i==0)
                c[i].a=0;
            else
                c[i].a=b[i-1].b;
            if(i==g-1)
                c[i].b=n-1;
            else
                c[i].b=b[i+1].b;
        }

    }

    if(g<=k)
        printf("%d\n",n);
    else
    {
        ct=0;
        for(i=0;i<g-k+1;i++)
        {
            ct=c[i+k-1]-c[i].a+1;
            if(ci<ct)
                ci=ct;
        }
    }
    printf("%d\n",ci);


    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:28: error: conversion from 'int' to non-scalar type 'YPO' requested
   13 |     struct YPO b[100050],h=0,g,t=0;
      |                            ^
a.cc:13:34: error: conversion from 'int' to non-scalar type 'YPO' requested
   13 |     struct YPO b[100050],h=0,g,t=0;
      |                                  ^
a.cc:24:14: error: no match for 'operator[]' (operand types are 'YPO [100050]' and 'YPO')
   24 |             b[h].a=i;
      |              ^
a.cc:25:14: error: no match for 'operator[]' (operand types are 'YPO [100050]' and 'YPO')
   25 |             b[h].b=j-1;
      |              ^
a.cc:26:14: error: no 'operator++(int)' declared for postfix '++' [-fpermissive]
   26 |             h++;
      |             ~^~
a.cc:31:8: error: no match for 'operator-' (operand types are 'YPO' and 'int')
   31 |     g=h-1;
      |       ~^~
      |       | |
      |       | int
      |       YPO
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:618:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__y.base() - __x.base())) std::operator-(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  618 |     operator-(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:618:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   'YPO' is not derived from 'const std::reverse_iterator<_Iterator>'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__x.base() - __y.base())) std::operator-(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1790 |     operator-(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   'YPO' is not derived from 'const std::move_iterator<_IteratorL>'
   31 |     g=h-1;
      |         ^
In file included from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:2:
/usr/include/c++/14/complex:370:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator-(const complex<_Tp>&, const complex<_Tp>&)'
  370 |     operator-(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:370:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   'YPO' is not derived from 'const std::complex<_Tp>'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/complex:379:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator-(const complex<_Tp>&, const _Tp&)'
  379 |     operator-(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:379:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   'YPO' is not derived from 'const std::complex<_Tp>'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/complex:388:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator-(const _Tp&, const complex<_Tp>&)'
  388 |     operator-(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:388:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   mismatched types 'const std::complex<_Tp>' and 'int'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/complex:465:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator-(const complex<_Tp>&)'
  465 |     operator-(const complex<_Tp>& __x)
      |     ^~~~~~~~
/usr/include/c++/14/complex:465:5: note:   candidate expects 1 argument, 2 provided
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__minus, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   'YPO' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__minus, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   'YPO' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__minus, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__minus, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   'YPO' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__minus, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/valarray:1197:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__minus, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const valarray<_Tp>&, const valarray<_Tp>&)'
 1197 | _DEFINE_BINARY_OPERATOR(-, __minus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1197:1: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   'YPO' is not derived from 'const std::valarray<_Tp>'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/valarray:1197:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__minus, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1197 | _DEFINE_BINARY_OPERATOR(-, __minus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1197:1: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   'YPO' is not derived from 'const std::valarray<_Tp>'
   31 |     g=h-1;
      |         ^
/usr/include/c++/14/valarray:1197:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__minus, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1197 | _DEFINE_BINARY_OPERATOR(-, __minus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1197:1: note:   template argument deduction/substitution failed:
a.cc:31:9: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
   31 |     g=h-1;
      |         ^
a.cc:32:22: error: no match for 'operator-' (operand types are 'YPO' and 'int')
   32 |     if(b[0].a!=0&&b[h-1].b==n-1)
      |                     ~^~
      |                     | |
      |                     | int
      |                     YPO
/usr/include/c++/14/bits/stl_iterator.h:618:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__y.base() - __x.base())) std::operator-(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  618 |     operator-(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c