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Interleaving String
This problem is a state-machine in disguise, and DP is how you keep it under control. Interviewers love it because it reveals your state-and-transition thinking and your edge-case discipline. The trap is picking a state that's too vague; keep it minimal and consistent.
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.