Language: C++

#include<iostream>
#include<stdio.h>
#include<queue>
#include<algorithm>
#include<math.h>
#include<stack>
#include<map>
#include<limits.h>
#include<vector>
#include<string.h>
#include<string>
using namespace std;
typedef long long LL;
typedef pair<int,int> pii;
const int N = 2e5+5;
const int Mod = 1e9+7;
#define pi acos(-1)
#define INF 1e9+5
#define INM INT_MIN
#define pb(a)  push_back(a)
#define mk(a,b) make_pair(a,b)
#define dbg(x) cout << "now this num is " << x << endl;
#define met0(axx) memset(axx,0,sizeof(axx));
#define metf(axx) memset(axx,-1,sizeof(axx));
#define sd(ax) scanf("%d",&ax)
#define sld(ax) scanf("%lld",&ax)
#define sldd(ax,bx) scanf("%lld %lld",&ax,&bx)
#define sdd(ax,bx) scanf("%d %d",&ax,&bx)
#define sddd(ax,bx,cx) scanf("%d %d %d",&ax,&bx,&cx)
#define sfd(ax) scanf("%lf",&ax)
#define sfdd(ax,bx) scanf("%lf %lf",&ax,&bx)
#define pr(a) printf("%d\n",a)
#define plr(a) printf("%lld\n",a)
/*
贪心？pu..看zzl学长的贪心,emm..很微妙.也能过
但是可以直接dfs暴搜..
*/
int n,f = 0;
string s[N],ans;
void dfs(int x,int y,int z,int i)
{
	if(f) return ;
	if(i == n+1)
	{
		if(x >= 0 && y >= 0 && z >= 0)
		{
			f = 1;
			printf("Yes\n");
			for(int i=1;i<=n;++i) cout << ans[i] << "\n";
		}
		return ;
	}
	char a = s[i][0],b = s[i][1];
	if(s[i] == "AB" || s[i] == "BA")
	{
		ans[i] = 'A';
		dfs(x+1,y-1,z,i+1);
		ans[i] = 'B';
		dfs(x-1,y+1,z,i+1);
	}
	if(s[i] == "BC" || s[i] == "CB")
	{
		ans[i] = 'B';
		dfs(x,y+1,z-1,i+1);
		ans[i] = 'C';
		dfs(x,y-1,z+1,i+1);
	}
	if(s[i] == "AC" || s[i] == 'CA')
	{
		ans[i] = 'A';
		dfs(x+1,y,z-1,i+1);
		ans[i] = 'C';
		dfs(x-1,y,z+1,i+1);
	}
}
int main()
{
	sd(n);
	int a,b,c;sddd(a,b,c);
	for(int i=1;i<=n;++i) cin >> s[i];
	dfs(a,b,c,1);
	if(!f) printf("No\n");
	//system("pause");
	return 0;
}


Compiler output:
a.cc:68:36: warning: multi-character character constant [-Wmultichar]
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
a.cc: In function 'void dfs(int, int, int, int)':
a.cc:68:33: error: no match for 'operator==' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'int')
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                            ~~~~ ^~ ~~~~
      |                               |    |
      |                               |    int
      |                               std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/iosfwd:42,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::fpos<_StateT>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
In file included from /usr/include/c++/14/string:43,
                 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:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)'
  235 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:235:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::allocator<_CharT>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
In file included from /usr/include/c++/14/string:48:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
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:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::pair<_T1, _T2>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
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:629:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  629 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:629:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
/usr/include/c++/14/string_view:637:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  637 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:637:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
/usr/include/c++/14/string_view:644:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  644 |     operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:644:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
/usr/include/c++/14/bits/basic_string.h:3755:5: 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>&)'
 3755 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3755:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
/usr/include/c++/14/bits/basic_string.h:3772:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3772 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3772:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   mismatched types 'const _CharT*' and 'int'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
/usr/include/c++/14/bits/basic_string.h:3819:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3819 |     operator==(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3819:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   mismatched types 'const _CharT*' and 'std::__cxx11::basic_string<char>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
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:2558:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator==(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2558 |     operator==(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2558:5: note:   template argument deduction/substitution failed:
a.cc:68:36: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::tuple<_UTypes ...>'
   68 |         if(s[i] == "AC" || s[i] == 'CA')
      |                                    ^~~~
In file included from /usr/include/c++/14/bits/locale_facets.h:48,
                 from /usr/include/c++/14/bits/basic_ios.h:37,
                 from /usr/include/c++/14/ios:46:
/usr/include/c++/14/bits/streambuf_iterator.h:234:5: note: candidate: 'template<class _CharT, class _Traits>