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#include <iostream>
#include <string>
#include <vector>
 
int main()
{
	const std::vector<std::pair<char, std::string> > html_chars = {
		{ '"', "&quot;" },
		{ '&', "&amp;" },
		{ '<', "&lt;" },
		{ '>', "&gt;" },
	}
	std::string password = "&&";
 
	for (auto html_char : html_chars) {
 
			size_t pos = password.find(html_char.first);
 
		while (pos != std::string::npos) {	
			password.replace(pos, 1, html_char.second);
			pos = password.find(html_char.first, pos + 1);
		}
	}
 
	std::cout << password << std::endl;
 
	return 0;	
}

prog.cpp: In function 'int main()':
prog.cpp:13:2: error: expected ',' or ';' before 'std'
  std::string password = "&&";
  ^
prog.cpp:17:17: error: 'password' was not declared in this scope
    size_t pos = password.find(html_char.first);
                 ^
prog.cpp:25:15: error: 'password' was not declared in this scope
  std::cout << password << std::endl;
               ^

Standard output is empty