How does a Priority Queue handle ties in priority? (Stability)

Difficulty: 5/10

stability, heap implementation, ordering guarantees

Priority Queue Stability

When multiple elements have the same priority, a priority queue does not necessarily preserve their insertion order. If the application requires equal-priority elements to be processed in arrival order, the queue must explicitly implement stable tie-breaking.

javascript

1
A plain heap generally guarantees priority ordering, not FIFO ordering among equal priorities.
2
A monotonically increasing sequence number provides deterministic FIFO tie-breaking.
3
The comparison should first use priority and then sequence number.
4
Stable behavior is important in schedulers, event processing, and fair task execution.
5
Tie-breaking rules should be explicitly documented because unspecified ordering can create nondeterministic application behavior.

Scenario Questions

0-2 years experience

Follow-up Questions