Language: C++

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
int main(){
	int i;
	string s;
	cin >> s;
	sort(s.begin(),s.end());
	for(i = 1;i < s.size();i++){
		if(s[i] == s[i-1]){
			cout << "no" << endl;
			return 0;
		}
	}
	cout << "yes" << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'string' was not declared in this scope
    7 |         string s;
      |         ^~~~~~
a.cc:7:9: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 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/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included 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/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:8:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |         cin >> s;
      |         ^~~
      |         std::cin
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:8:16: error: 's' was not declared in this scope
    8 |         cin >> s;
      |                ^
a.cc:9:9: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
    9 |         sort(s.begin(),s.end());
      |         ^~~~
      |         std::sort
In file included from /usr/include/c++/14/algorithm:86,
                 from a.cc:3:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: 'std::sort' declared here
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
a.cc:12:25: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   12 |                         cout << "no" << endl;
      |                         ^~~~
      |                         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:12:41: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   12 |                         cout << "no" << endl;
      |                                         ^~~~
      |                                         std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:16:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   16 |         cout << "yes" << endl;
      |         ^~~~
      |         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:16:26: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   16 |         cout << "yes" << endl;
      |                          ^~~~
      |                          std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~