double ended queue

Contoh Double Ended Queue

ciri2 double ended queue :

1. kosong : L = R + 1
2. penuh kanan : R = n – 1
3. penuh kiri : L = 0
4. penuh kanan dan kiri : R = n – 1 && L = 0
5. bisa diisi dari kanan : R < n
6. bisa diisi dari kiri : L > 0
7. ada isinya : L < R + 1

kondisi awal :

L = 0;
R = -1;

algoritma dasar double ended queue :

1. INSERT KANAN

   R = R + 1;
   Q[R] = X;

2. INSERT KIRI

   L = L - 1;
   Q[L] = X;

3. DELETE KANAN

   X = Q[R];
   R = R - 1;

4. DELETE KIRI

   X = Q[L];
   L = L + 1;

algoritma lengkap double ended queue :

1. INSERT KANAN

   void INSERT_KANAN(void){
     if(R < n-1){
        R  =  R + 1;
        Q[R]  =  X;
     }else{
        printf("antrian penuh kanan");
     }
   }

2. INSERT KIRI

   void INSERT_KIRI(void){
     if( L > 0){
         L = L - 1; 
         Q[L]  =  X;
     }else{
         printf("antrian penuh kiri");
     }
   }

3. DELETE KANAN

   void DELETE_KANAN(void){
     if(L < R+1){
        X  =  Q[R];
        R   =   R - 1;
     }else{
       printf("antrian kosong");
     }
   }

4. DELETE KIRI

   void DELETE_KIRI(void){
     if(L < R+1){
        X = Q[L];
        L = L + 1;
     }else{
        printf("antrian kosong");
     }
   }

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