🎨 Tri-Color Pointer Parade

Dutch National Flag Problem: Sort 0s, 1s, and 2s with three pointers

0 (Red)
1 (White)
2 (Blue)
0s Zone
[0, low-1]
1s Zone
[low, mid-1]
2s Zone
[high+1, n-1]
Ready to sort
low
0
mid
0
high
0
Swaps
0