Language: C++

#include<algorithm>
#include<iostream>
#include<vector>
#include<stdio.h>
#include<string.h>

int main()
{
	int card[5];
	
	while( scanf( "%d,%d,%d,%d,%d", &card[0], &card[1], &card[2], &card[3], &card[4] ) != EOF ){
	 	
		int a[20];
		memset( a, 0, sizeof( a ) );
		int c = 0;
		
		for( int i = 0; i < 5; i++ ) a[card[i]]++;
		
		for( int i = 0; i < 5; i++ ){
			 c = std::max( c, std::count( card, card + 5, card[i] ) );
		}
		
		bool f = false;
		int m;
		
		switch( c ){
			case 4:
		 		puts( "four card" );
				break;
			case 3:
				for( int i = 0; i < 5; i++ ){
			 		if( std::count( card, card + 5, card[i] ) == 2 ){
						f = true; 
						break;
					}
				}
				
				if( f ){
				 	puts( "full house" );
				}
				else{
				 	puts( "three card" );
				}
				break;
			case 2:
				for( int i = 0; i < 5; i++ ){
					if( std::count( card, card + 5, card[i] ) == 2 && !f ){
					 	m = card[i];
						f = true;
					}
					if( card[i] != m && std::count( card, card + 5, card[i] ) == 2 && f ){
						puts( "two pair" );
						goto end;
					}
				}
				puts( "one pair" );
				break;
			case 1:	
				for( int i = 1; i <= 10; i++ ){
					if( a[i] == 1 && a[i+1] == 1 && a[i+2] == 1 && a[i+3] == 1 && a[(i+4)%13] == 1 ) f = true;
				}
				
				if( f ){
				 	puts( "straight" );
				}
				else{
					puts( "null" );
				}
				
				break;
		}
		
	end:
	}

 	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:38: error: no matching function for call to 'max(int&, std::iterator_traits<int*>::difference_type)'
   20 |                          c = std::max( c, std::count( card, card + 5, card[i] ) );
      |                              ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:20:38: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::iterator_traits<int*>::difference_type' {aka 'long int'})
   20 |                          c = std::max( c, std::count( card, card + 5, card[i] ) );
      |                              ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:20:38: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   20 |                          c = std::max( c, std::count( card, card + 5, card[i] ) );
      |                              ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:74:9: warning: label at end of compound statement only available with '-std=c++2b' or '-std=gnu++2b' [-Wc++23-extensions]
   74 |         }
      |         ^