Òåõíèêà çàùèòû êîìïàêò-äèñêîâ îò êîïèðîâàíèÿ

         

êàê òîëüêî ìû íàéäåì q,


                     if (q > 0)

                     {

                            j=q ;

                            do

                     {

                            j-- ;

                            if ((d[j]!=-1) && (u_lu[q]<u_lu[j]))

                            q = j ;

                     } while (j>0);

               };

              

               // êàê òîëüêî ìû íàéäåì q, òàêîé ÷òî d[u]!=0

               // è u_lu[q] åñòü ìàêñèìóì

               // çàïèøåì ñòåïåíü íîâîãî elp ïîëèíîìà

               if (l[u] > l[q]+u-q) l[u+1] = l[u]; else  l[u+1] = l[q]+u-q;

              

              

               // ôîðìèðóåì íîâûé elp(x)

               for (i = 0; i < n - k; i++) elp[u+1][i] = 0;

               for (i = 0; i <= l[q]; i++)

                     if (elp[q][i]!=-1)

                            elp[u+1][i+u-q]=alpha_to[(d[u]+n-d[q]+elp[q][i])%n];

              

               for (i=0; i<=l[u]; i++)

               {

                     elp[u+1][i] ^= elp[u][i];

                    

                     // ïðåîáðàçóåì ñòàðûé elp

                     // â èíäåêñíóþ ôîðìó

                     elp[u][i] = index_of[elp[u][i]];

               }

         }

         u_lu[u+1] = u-l[u+1];

        

         // ôîðìèðóåì (u + 1)'þ íåâÿçêó

         //---------------------------------------------------------------------

         if (u < n-k)            // íà ïîñëåäíåé èòåðàöèè ðàñõîæäåíèå

         {                       // íå áûëî îáíàðóæåíî

              

               if (s[u + 1]!=-1) d[u+1] = alpha_to[s[u+1]]; else d[u + 1] = 0;

              

               for (i = 1; i <= l[u + 1]; i++)

                     if ((s[u + 1 - i] != -1) && (elp[u + 1][i]!=0))

                     d[u+1] ^= alpha_to[(s[u+1-i]+index_of[elp[u+1][i]])%n];

              

               // ïåðåâîäèì d[u+1] â èíäåêñíóþ ôîðìó

               d[u+1] = index_of[d[u+1]];

         }

    } while ((u < n-k) && (l[u+1]<=t));


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