Language: C++

#include<bits/stdc++.h>

using namespace std;
int partition (int arr[][3], int low, int high)  
{  
    int pivot = arr[high][2]; // pivot  
    int i = (low - 1); // Index of smaller element  
  
    for (int j = low; j <= high - 1; j++)  
    {  
        // If current element is smaller than the pivot  
        if (arr[j][2] < pivot)  
        {  
            i++; // increment index of smaller element  
            int temp=a[i][2];  int t1=a[i][1]; 	int t2=a[i][0];
          	a[i][2]=a[j][2];	a[i][1]=a[j][1];	a[i][0]=a[j][0];
          	a[j][2]=temp;		a[j][1]=at1;		a[j][0]=t2;
        }  
    }  
    swap(&arr[i + 1], &arr[high]);  
    return (i + 1);  
}  
void quickSort(int arr[][3], int low, int high)  
{  
    if (low < high)  
    {  
        /* pi is partitioning index, arr[p] is now  
        at right place */
        int pi = partition(arr, low, high);  
  
        // Separately sort elements before  
        // partition and after partition  
        quickSort(arr, low, pi - 1);  
        quickSort(arr, pi + 1, high);  
    }  
}  
int main()
{
  int n,T;
  cin>>n>>T;
  
  int a[n][3];
  for(int i=0;i<n;i++)
  {  cin>>a[i][0]>>a[i][1];
      a[i][2]=a[i][0]*n+a[i][1];
  }
  quicksort(a,n,2);
  int t=1,c=0;
  for(int i=0;i<n;i++)
  {
    t+=a[i][0]*t+a[i][1];
    if(t<=T) ++c;
    else break;
    
    t++;
  }
  cout<<c<<endl;
  }

Compiler output:
a.cc: In function 'int partition(int (*)[3], int, int)':
a.cc:15:22: error: 'a' was not declared in this scope
   15 |             int temp=a[i][2];  int t1=a[i][1];  int t2=a[i][0];
      |                      ^
a.cc:17:49: error: 'at1' was not declared in this scope; did you mean 't1'?
   17 |                 a[j][2]=temp;           a[j][1]=at1;            a[j][0]=t2;
      |                                                 ^~~
      |                                                 t1
a.cc:20:9: error: no matching function for call to 'swap(int (*)[3], int (*)[3])'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/bits/stl_pair.h:61,
                 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,
                 from a.cc:1:
/usr/include/c++/14/bits/move.h:226:5: note: candidate: 'std::_Require<std::__not_<std::__is_tuple_like<_Tp> >, std::is_move_constructible<_Tp>, std::is_move_assignable<_Tp> > std::swap(_Tp&, _Tp&) [with _Tp = int (*)[3]; _Require<__not_<__is_tuple_like<_Tp> >, is_move_constructible<_Tp>, is_move_assignable<_Tp> > = void]' (near match)
  226 |     swap(_Tp& __a, _Tp& __b)
      |     ^~~~
/usr/include/c++/14/bits/move.h:226:5: note:   conversion of argument 2 would be ill-formed:
a.cc:20:23: error: cannot bind non-const lvalue reference of type 'int (*&)[3]' to an rvalue of type 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |                       ^~~~~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:77:
/usr/include/c++/14/any:430:15: note: candidate: 'void std::swap(any&, any&)' (near match)
  430 |   inline void swap(any& __x, any& __y) noexcept { __x.swap(__y); }
      |               ^~~~
/usr/include/c++/14/any:430:15: note:   conversion of argument 2 would be ill-formed:
a.cc:20:23: error: cannot bind non-const lvalue reference of type 'std::any&' to an rvalue of type 'std::any'
   20 |     swap(&arr[i + 1], &arr[high]);
      |                       ^~~~~~~~~~
/usr/include/c++/14/any:191:7: note:   after user-defined conversion: 'std::any::any(_Tp&&) [with _Tp = int (*)[3]; _VTp = int (*)[3]; _Mgr = _Manager_internal<int (*)[3]>; typename std::enable_if<(is_copy_constructible_v<_VTp> && (! __is_in_place_type_v<_VTp>)), bool>::type <anonymous> = true]'
  191 |       any(_Tp&& __value)
      |       ^~~
In file included from /usr/include/c++/14/exception:166,
                 from /usr/include/c++/14/stdexcept:38,
                 from /usr/include/c++/14/system_error:43,
                 from /usr/include/c++/14/bits/ios_base.h:46,
                 from /usr/include/c++/14/streambuf:43,
                 from /usr/include/c++/14/bits/streambuf_iterator.h:35,
                 from /usr/include/c++/14/iterator:66,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:54:
/usr/include/c++/14/bits/exception_ptr.h:229:5: note: candidate: 'void std::__exception_ptr::swap(exception_ptr&, exception_ptr&)'
  229 |     swap(exception_ptr& __lhs, exception_ptr& __rhs)
      |     ^~~~
/usr/include/c++/14/bits/exception_ptr.h:229:25: note:   no known conversion for argument 1 from 'int (*)[3]' to 'std::__exception_ptr::exception_ptr&'
  229 |     swap(exception_ptr& __lhs, exception_ptr& __rhs)
      |          ~~~~~~~~~~~~~~~^~~~~
In file included from /usr/include/c++/14/future:51,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:176:
/usr/include/c++/14/bits/std_thread.h:328:3: note: candidate: 'void std::swap(thread&, thread&)'
  328 |   swap(thread& __x, thread& __y) noexcept
      |   ^~~~
/usr/include/c++/14/bits/std_thread.h:328:16: note:   no known conversion for argument 1 from 'int (*)[3]' to 'std::thread&'
  328 |   swap(thread& __x, thread& __y) noexcept
      |        ~~~~~~~~^~~
In file included from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/sstream:1204:5: note: candidate: 'template<class _CharT, class _Traits, class _Allocator> void std::__cxx11::swap(basic_stringbuf<_CharT, _Traits, _Alloc>&, basic_stringbuf<_CharT, _Traits, _Alloc>&)'
 1204 |     swap(basic_stringbuf<_CharT, _Traits, _Allocator>& __x,
      |     ^~~~
/usr/include/c++/14/sstream:1204:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types 'std::__cxx11::basic_stringbuf<_CharT, _Traits, _Alloc>' and 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/sstream:1212:5: note: candidate: 'template<class _CharT, class _Traits, class _Allocator> void std::__cxx11::swap(basic_istringstream<_CharT, _Traits, _Allocator>&, basic_istringstream<_CharT, _Traits, _Allocator>&)'
 1212 |     swap(basic_istringstream<_CharT, _Traits, _Allocator>& __x,
      |     ^~~~
/usr/include/c++/14/sstream:1212:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types 'std::__cxx11::basic_istringstream<_CharT, _Traits, _Allocator>' and 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/sstream:1219:5: note: candidate: 'template<class _CharT, class _Traits, class _Allocator> void std::__cxx11::swap(basic_ostringstream<_CharT, _Traits, _Allocator>&, basic_ostringstream<_CharT, _Traits, _Allocator>&)'
 1219 |     swap(basic_ostringstream<_CharT, _Traits, _Allocator>& __x,
      |     ^~~~
/usr/include/c++/14/sstream:1219:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types 'std::__cxx11::basic_ostringstream<_CharT, _Traits, _Allocator>' and 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/sstream:1226:5: note: candidate: 'template<class _CharT, class _Traits, class _Allocator> void std::__cxx11::swap(basic_stringstream<_CharT, _Traits, _Allocator>&, basic_stringstream<_CharT, _Traits, _Allocator>&)'
 1226 |     swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x,
      |     ^~~~
/usr/include/c++/14/sstream:1226:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types 'std::__cxx11::basic_stringstream<_CharT, _Traits, _Allocator>' and 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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:896:5: note: candidate: 'template<class _Ch_type, class _Rx_traits> void std::__cxx11::swap(basic_regex<_Ch_type, _Rx_traits>&, basic_regex<_Ch_type, _Rx_traits>&)'
  896 |     swap(basic_regex<_Ch_type, _Rx_traits>& __lhs,
      |     ^~~~
/usr/include/c++/14/bits/regex.h:896:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types 'std::__cxx11::basic_regex<_Ch_type, _Rx_traits>' and 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/regex.h:2230:5: note: candidate: 'template<class _Bi_iter, class _Alloc> void std::__cxx11::swap(match_results<_BiIter, _Alloc>&, match_results<_BiIter, _Alloc>&)'
 2230 |     swap(match_results<_Bi_iter, _Alloc>& __lhs,
      |     ^~~~
/usr/include/c++/14/bits/regex.h:2230:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types 'std::__cxx11::match_results<_BiIter, _Alloc>' and 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/move.h:250:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> std::__enable_if_t<((bool)std::__is_swappable<_Tp>::value)> std::swap(_Tp (&)[_Nm], _Tp (&)[_Nm])'
  250 |     swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
      |     ^~~~
/usr/include/c++/14/bits/move.h:250:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types '_Tp [_Nm]' and 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1089:5: note: candidate: 'template<class _T1, class _T2> typename std::enable_if<std::__and_<std::__is_swappable<_T1>, std::__is_swappable<_T2> >::value>::type std::swap(pair<_T1, _T2>&, pair<_T1, _T2>&)'
 1089 |     swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
      |     ^~~~
/usr/include/c++/14/bits/stl_pair.h:1089:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types 'std::pair<_T1, _T2>' and 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1106:5: note: candidate: 'template<class _T1, class _T2> typename std::enable_if<(! std::__and_<std::__is_swappable<_T1>, std::__is_swappable<_T2> >::value)>::type std::swap(pair<_T1, _T2>&, pair<_T1, _T2>&)' (deleted)
 1106 |     swap(pair<_T1, _T2>&, pair<_T1, _T2>&) = delete;
      |     ^~~~
/usr/include/c++/14/bits/stl_pair.h:1106:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types 'std::pair<_T1, _T2>' and 'int (*)[3]'
   20 |     swap(&arr[i + 1], &arr[high]);
      |     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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:4039:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> void std::swap(__cxx11::basic_string<_CharT, _Traits, _Allocator>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 4039 |     swap(basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~
/usr/include/c++/14/bits/basic_string.h:4039:5: note:   template argument deduction/substitution failed:
a.cc:20:9: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Allocat