linked list pointer Pattern
Pattern hubs are for building transferable solving frames. Learn the recognition signals first, then drill state definition, update rules, and edge explanation until the pattern feels stable.
Pattern brief
Recognize first
Check how you handle carries at each node and whether your pointers correctly traverse both lists.
Solve rhythm
State the active state and invariant first, explain how each update preserves them, then pressure-test with counterexamples.
Most common miss
Failing to propagate carry to a new node after both lists are processed.
Recognition signals
- Check how you handle carries at each node and whether your pointers correctly traverse both lists.
- Notice if you address unequal list lengths without skipping nodes or losing digits.
- Look for knowledge of linked-list pointer manipulation.
Solve flow
- 1. Define the active state/window.
- 2. Update state while preserving invariants.
- 3. Validate with edge-heavy examples.
Common misses
- Failing to propagate carry to a new node after both lists are processed.
- Not properly handling the edge case where the list has only one element or when n is equal to the list length.
- Failing to handle the case where one list is empty.
Recommended Ladder
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