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Unique Paths
Unique Paths is about turning repeated work into a reusable state instead of re-solving subproblems. Interviewers love it because it reveals your state-and-transition thinking and your edge-case discipline. Don't rush the code—spend your time nailing the state definition first.
Learn this pattern
Dynamic Programming Patterns
Dynamic programming caches overlapping subproblem results so each is solved only once. Define your state in one sentence, write the transition, nail the base cases, and brute-force transforms into polynomial time.
Meet your coaches
Talk through the problem while you code. Signed-in reps become prep memory for the next session.
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Dynamic Programming Patterns gives you a useful next rep while you are still on your phone.