Design Circular Queue — interactive algorithm visualization

Medium · Ring Buffer · time O(1) · space O(k)

A fixed-capacity buffer with head/rear indices that wrap around. Enqueue and dequeue in O(1) without shifting.

Example input: capacity = 3, ops = [enq, enq, enq, deq, enq]

Step through a verified execution trace - every step shows the real state, the invariant that keeps the algorithm correct, and asks you to predict what happens next.

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