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←Level 4 — Data Structures
Hash Maps
O(1) Sutra
1 / 6⚡ 170 XP
Step 1 — O(1) Average-Case Operations
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Hash Maps: Instant Lookup

seen = {}; if x in seen: O(1) lookup vs O(n) linear search

Goal: Apply frequency counting, grouping by key, and sliding-window patterns with dicts.