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void kompresja(const std::string nazwa_pliku, const int r_wej, const int r_his, std::string& tekst)
{
	std::cout << "Wielkosc pliku przed kompresja wynosi " << 8 * tekst.length() << " bitow" << std::endl;
	int bity_pliku_wyj{ 8 };
	int bity_his {ile_bitow(r_his)};
	std::cout << bity_his << std::endl;
	std::ofstream plik(nazwa_pliku);
	plik << tekst[0];
	std::string chwilowy(r_his, tekst[0]);
	tekst.insert(0, chwilowy);
	int wsk_his{0};
	int wsk_wej{r_his};
	for (int wsk_wej = r_his; wsk_wej < tekst.length();)
	{
		int C{}, P{}, C_max{};
			for (int k = wsk_his; k < wsk_his + r_his && k < tekst.length(); k++)
				if (tekst[wsk_wej] == tekst[k])
				{
					C = 1;
						while ( (tekst[wsk_wej + C] == tekst[k + C]) && (wsk_wej + C < tekst.length()) && (C < r_wej) && (C < r_his))
							if ((wsk_wej+C < tekst.length()) && (k+C < tekst.length()))
								C++;
						if (C > C_max)
						{
							C_max = C;
							P = k - wsk_his;
						}
				}
		if ((C_max == 0) or (bity_his + bity_his > 8 * C_max))
		{
			bity_pliku_wyj += 9;
			plik << '1' << tekst[wsk_wej] << std::endl;
			wsk_his += 1;
			wsk_wej += 1;
		}
		else
		{
			bity_pliku_wyj += 1 + bity_his + bity_his;
			plik << '0' << P << C_max << std::endl;
			wsk_his += C_max;
			wsk_wej += C_max;
		}
 
 
	}
	std::cout << "Wielkosc pliku po kompresji wynosi " << bity_pliku_wyj << " bitow" << std::endl;
	plik.close();	
}

prog.cpp:1:27: error: ‘string’ in namespace ‘std’ does not name a type
 void kompresja(const std::string nazwa_pliku, const int r_wej, const int r_his, std::string& tekst)
                           ^~~~~~
prog.cpp:1:22: note: ‘std::string’ is defined in header ‘<string>’; did you forget to ‘#include <string>’?
+#include <string>
 void kompresja(const std::string nazwa_pliku, const int r_wej, const int r_his, std::string& tekst)
                      ^~~
prog.cpp:1:86: error: ‘std::string’ has not been declared
 void kompresja(const std::string nazwa_pliku, const int r_wej, const int r_his, std::string& tekst)
                                                                                      ^~~~~~
prog.cpp: In function ‘void kompresja(int, int, int, int&)’:
prog.cpp:3:7: error: ‘cout’ is not a member of ‘std’
  std::cout << "Wielkosc pliku przed kompresja wynosi " << 8 * tekst.length() << " bitow" << std::endl;
       ^~~~
prog.cpp:3:7: note: ‘std::cout’ is defined in header ‘<iostream>’; did you forget to ‘#include <iostream>’?
prog.cpp:1:1:
+#include <iostream>
 void kompresja(const std::string nazwa_pliku, const int r_wej, const int r_his, std::string& tekst)
prog.cpp:3:7:
  std::cout << "Wielkosc pliku przed kompresja wynosi " << 8 * tekst.length() << " bitow" << std::endl;
       ^~~~
prog.cpp:3:69: error: request for member ‘length’ in ‘tekst’, which is of non-class type ‘int’
  std::cout << "Wielkosc pliku przed kompresja wynosi " << 8 * tekst.length() << " bitow" << std::endl;
                                                                     ^~~~~~
prog.cpp:3:98: error: ‘endl’ is not a member of ‘std’
  std::cout << "Wielkosc pliku przed kompresja wynosi " << 8 * tekst.length() << " bitow" << std::endl;
                                                                                                  ^~~~
prog.cpp:3:98: note: ‘std::endl’ is defined in header ‘<ostream>’; did you forget to ‘#include <ostream>’?
prog.cpp:1:1:
+#include <ostream>
 void kompresja(const std::string nazwa_pliku, const int r_wej, const int r_his, std::string& tekst)
prog.cpp:3:98:
  std::cout << "Wielkosc pliku przed kompresja wynosi " << 8 * tekst.length() << " bitow" << std::endl;
                                                                                                  ^~~~
prog.cpp:5:16: error: ‘ile_bitow’ was not declared in this scope
  int bity_his {ile_bitow(r_his)};
                ^~~~~~~~~
prog.cpp:6:7: error: ‘cout’ is not a member of ‘std’
  std::cout << bity_his << std::endl;
       ^~~~
prog.cpp:6:7: note: ‘std::cout’ is defined in header ‘<iostream>’; did you forget to ‘#include <iostream>’?
prog.cpp:6:32: error: ‘endl’ is not a member of ‘std’
  std::cout << bity_his << std::endl;
                                ^~~~
prog.cpp:6:32: note: ‘std::endl’ is defined in header ‘<ostream>’; did you forget to ‘#include <ostream>’?
prog.cpp:7:7: error: ‘ofstream’ is not a member of ‘std’
  std::ofstream plik(nazwa_pliku);
       ^~~~~~~~
prog.cpp:7:7: note: ‘std::ofstream’ is defined in header ‘<fstream>’; did you forget to ‘#include <fstream>’?
prog.cpp:1:1:
+#include <fstream>
 void kompresja(const std::string nazwa_pliku, const int r_wej, const int r_his, std::string& tekst)
prog.cpp:7:7:
  std::ofstream plik(nazwa_pliku);
       ^~~~~~~~
prog.cpp:8:2: error: ‘plik’ was not declared in this scope
  plik << tekst[0];
  ^~~~
prog.cpp:8:17: error: invalid types ‘int[int]’ for array subscript
  plik << tekst[0];
                 ^
prog.cpp:9:7: error: ‘string’ is not a member of ‘std’
  std::string chwilowy(r_his, tekst[0]);
       ^~~~~~
prog.cpp:9:7: note: ‘std::string’ is defined in header ‘<string>’; did you forget to ‘#include <string>’?
prog.cpp:10:8: error: request for member ‘insert’ in ‘tekst’, which is of non-class type ‘int’
  tekst.insert(0, chwilowy);
        ^~~~~~
prog.cpp:10:18: error: ‘chwilowy’ was not declared in this scope
  tekst.insert(0, chwilowy);
                  ^~~~~~~~
prog.cpp:13:44: error: request for member ‘length’ in ‘tekst’, which is of non-class type ‘int’
  for (int wsk_wej = r_his; wsk_wej < tekst.length();)
                                            ^~~~~~
prog.cpp:16:59: error: request for member ‘length’ in ‘tekst’, which is of non-class type ‘int’
    for (int k = wsk_his; k < wsk_his + r_his && k < tekst.length(); k++)
                                                           ^~~~~~
prog.cpp:17:22: error: invalid types ‘int[int]’ for array subscript
     if (tekst[wsk_wej] == tekst[k])
                      ^
prog.cpp:17:34: error: invalid types ‘int[int]’ for array subscript
     if (tekst[wsk_wej] == tekst[k])
                                  ^
prog.cpp:20:33: error: invalid types ‘int[int]’ for array subscript
       while ( (tekst[wsk_wej + C] == tekst[k + C]) && (wsk_wej + C < tekst.length()) && (C < r_wej) && (C < r_his))
                                 ^
prog.cpp:20:49: error: invalid types ‘int[int]’ for array subscript
       while ( (tekst[wsk_wej + C] == tekst[k + C]) && (wsk_wej + C < tekst.length()) && (C < r_wej) && (C < r_his))
                                                 ^
prog.cpp:20:76: error: request for member ‘length’ in ‘tekst’, which is of non-class type ‘int’
       while ( (tekst[wsk_wej + C] == tekst[k + C]) && (wsk_wej + C < tekst.length()) && (C < r_wej) && (C < r_his))
                                                                            ^~~~~~
prog.cpp:21:31: error: request for member ‘length’ in ‘tekst’, which is of non-class type ‘int’
        if ((wsk_wej+C < tekst.length()) && (k+C < tekst.length()))
                               ^~~~~~
prog.cpp:21:57: error: request for member ‘length’ in ‘tekst’, which is of non-class type ‘int’
        if ((wsk_wej+C < tekst.length()) && (k+C < tekst.length()))
                                                         ^~~~~~
prog.cpp:32:32: error: invalid types ‘int[int]’ for array subscript
    plik << '1' << tekst[wsk_wej] << std::endl;
                                ^
prog.cpp:32:42: error: ‘endl’ is not a member of ‘std’
    plik << '1' << tekst[wsk_wej] << std::endl;
                                          ^~~~
prog.cpp:32:42: note: ‘std::endl’ is defined in header ‘<ostream>’; did you forget to ‘#include <ostream>’?
prog.cpp:39:38: error: ‘endl’ is not a member of ‘std’
    plik << '0' << P << C_max << std::endl;
                                      ^~~~
prog.cpp:39:38: note: ‘std::endl’ is defined in header ‘<ostream>’; did you forget to ‘#include <ostream>’?
prog.cpp:46:7: error: ‘cout’ is not a member of ‘std’
  std::cout << "Wielkosc pliku po kompresji wynosi " << bity_pliku_wyj << " bitow" << std::endl;
       ^~~~
prog.cpp:46:7: note: ‘std::cout’ is defined in header ‘<iostream>’; did you forget to ‘#include <iostream>’?
prog.cpp:46:91: error: ‘endl’ is not a member of ‘std’
  std::cout << "Wielkosc pliku po kompresji wynosi " << bity_pliku_wyj << " bitow" << std::endl;
                                                                                           ^~~~
prog.cpp:46:91: note: ‘std::endl’ is defined in header ‘<ostream>’; did you forget to ‘#include <ostream>’?

Standard output is empty