double stack

Contoh Double Stack

ciri2 double stack :

1. stack 1 kosong : top1 = -1
2. stack 2 kosong : top2 = n
3. stack penuh (stack 1 dan stack 2 tidak bisa diisi) : top2 – top1 = 1
4. stack bisa diisi (stack 1 dan stack 2 tidak bisa diisi) : top2 – top1 > 1
5. stack 1 ada isinya : top1 > -1
6. stack 2 ada isinya : top2 < n

kondisi awal :

top1 = -1;
top2 = n;

algoritma dasar double stack :

1. PUSH stack 1

   top1 = top1 + 1;
   s[top1] = x;

2. POP stack 1

   x = s[top1];
   top1 = top1 - 1;

3. PUSH stack 2

   top2 = top2 - 1;
   s[top2] = x;

4. POP stack 2

   x = s[top2];
   top2 = top2 + 1;

algoritma lengkap double stack :

1. PUSH stack 1

   void PUSH1(void){
      if(top2 - top1 > 1){
          top1  =  top1 + 1;
          s[top1] = x;
      }else{
          printf( "stack penuh");
      }
   }

2. POP stack 1

   void POP1(void){
      if(top1 > -1){
          x  =  s[top1];
          top1 = top1 - 1;
      }else{
          printf( "stack 1 kosong");
      }
   }

3. PUSH stack 2

   void PUSH2(void){
      if(top2 - top1 > 1){
          top2  =  top2 + 1;
          s[top2] = x;
      }else{
          printf( "stack penuh");
      }
   }

4. POP stack 2

   void POP2(void){
      if(top2 < n){
          x  =  s[top2];
          top2 = top2 + 1;
      }else{
          printf( "stack 2 kosong");
      }
   }

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