te begin() ja shton returnit nji boolean ne fund false.
else return const_iterator{table[i], i, table_size, table, false};

w() per ne ora 15 duket keshtu:
const_iterator w() const{
        size_type i {0};
        while(!table[i] && i < table_size) ++i;

        if(table_size <= i) return end();
        else return const_iterator{table[i], i, table_size, table, true};
    }

z() per ne ora 18 duket keshtu:
if (curr_size == 0 || curr_size == 1) return end();
    size_type i {0};
    while(!table[i] && i < table_size) ++i;

    if(table_size < i) return end();

    bool help {false};

    for (size_t pip = i; pip <= table_size; pip++){
      element * helpME = table[pip];
      while(helpME){
        if (pip > i) return const_iterator{table[pip], pip, table_size, table, true};
        if (help) return const_iterator{table[pip]->next, pip, table_size, table, true};
        else{
          help = true;
          helpME=helpME->next;
        }
      }
    }
    return end();
  }

ne iterator klasse i shton keto dy ne private
bool spec {false};
size_t skip {2}; // per ora 15
size_t skip {3}; // per ora 18

ne operator ++
if (spec) {
            for (size_t i{0}; i < skip; i++){
                if (idx < table_size){
                    ketu e fut kodin tond qe e ki ne operator++
                    }
                }
            }
            skip++;
        }
        else {
            ketu e fut kodin tond qe e ki ne operator++
            }
        }
return *this;