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#include <iostream>
 
 
struct AbstractFile
{
    char read_at_offset(int _n) = 0;
};
 
void assess(char _s, int& _opened)
{
    if (_s == '(')
        ++_opened;
    else
        --_opened;
}
 
int main()
{
    int n = 100;
    k = 4;
    if (k%2) return;
    AbstractFile* file = nullptr;
 
    int opened = 0;
    int correct_sequencies_n = 0;
 
    {
        char s = 0;
        for (int i = 0; i < k; ++i)
        {
            s = file->read_at_offset(i);
            assess(s, _opened);
        }
    }
 
    if (opened == 0)
        ++correct_sequencies_n;        
    int first = 0;
    for (int i = k; i < n; ++i)
    {   
        // shift right by one element
 
        // throw away first element
        if (file->read_at_offset(first) == '(')
            --_opened;
        else
            ++_opened;
 
        // consider new last element
        assess(file->read_at_offset(first+k), _opened);
        ++first;
        if (opened == 0)
            ++correct_sequencies_n;        
    }
}
 
 

prog.cpp:6:10: error: initializer specified for non-virtual method 'char AbstractFile::read_at_offset(int)'
     char read_at_offset(int _n) = 0;
          ^
prog.cpp: In function 'int main()':
prog.cpp:20:5: error: 'k' was not declared in this scope
     k = 4;
     ^
prog.cpp:21:14: error: return-statement with no value, in function returning 'int' [-fpermissive]
     if (k%2) return;
              ^
prog.cpp:32:23: error: '_opened' was not declared in this scope
             assess(s, _opened);
                       ^
prog.cpp:45:15: error: '_opened' was not declared in this scope
             --_opened;
               ^
prog.cpp:47:15: error: '_opened' was not declared in this scope
             ++_opened;
               ^
prog.cpp:50:47: error: '_opened' was not declared in this scope
         assess(file->read_at_offset(first+k), _opened);
                                               ^

Standard output is empty