Look for these signals in the problem:
- "Edit distance" or "transform one to another": Comparing two sequences character by character with operations.
- "Longest common" subsequence/substring: Finding shared structure between two sequences.
- "Grid path" counting or optimization: State is current position (row, col) in the grid.
- "Two sequences" comparison: When processing two strings/arrays in parallel.
- "Distinct subsequences" or counting matches: Counting ways to form one sequence from another.