c007: 00272 - TeX Quotes FYI: https://yunlinsong.blogspot.com/2015/04/c007-00272-tex-quotes.html

c007.cpp

#include <iostream>

using namespace std;

int main(void)
{
    char ch;
    int count = 1;
    while( cin.get(ch) )
    {
        if(ch == '"')
        {
            if( count == 1 )
                cout << "``";
            else if( count == 0 )
                cout << "''";

            count = 1 - count;
            continue;
        }

	    cout << ch;		
	}
	
    return 0;
}