Sorting

Sorting arranges data so that order-dependent logic — deduping, grouping, two-pointer sweeps, greedy choices — becomes simple. The sort itself is O(n log n); the skill is recognizing that ordering the input first makes the rest easy.

2 LeetCode problems solved with the Sorting pattern. Practice them with spaced repetition so the pattern sticks.

• H-IndexMEDIUM · O(n log n)
• Sort an ArrayMEDIUM · O(n log n)