Look for these signals in the problem:
- "Merge overlapping" intervals: Sort by start, merge consecutive overlapping intervals.
- "Insert" into sorted intervals: Find insertion point, merge affected intervals.
- "Meeting rooms" or resource allocation: Count overlapping intervals at any point in time.
- "Minimum intervals" to cover or remove: Greedy selection based on interval properties.
- "Intersection" of interval lists: Two-pointer technique on sorted intervals.