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Practice

Collections & Complexity Practice

⭐⭐ intermediate~25 min of coding3 challenges

Frequency maps, dedup strategy, queue simulation, and the eviction shape — every choice defended by operation cost.

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What you will practice

  1. Frequency Map + First Unique⭐⭐ intermediate
  2. Dedup: Pick the Structure⭐⭐ intermediate
  3. Debug: The Support Queue That Serves VIPs Last⭐⭐ intermediate

Need the concept first? Re-read the lesson.