04 Try it yourself Interactive

Step the pointers yourself

Both tabs start on 1 → 2 → 3 → 4, the list you just traced. Each press runs exactly one line. Watch the nodes lost counter: on the broken tab it jumps to 3 on the very first flip and never comes back down.

Broken · flips before saving
loses the tail on turn 1
1–6 whole numbers (0–99), commas or spaces.
Press Next to begin. Each press runs one line.


      

        
prev–

        
curr–

        
arrows flipped0

        
nodes lost0

      


      

      

        
        
        
        step 0 / 0