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Determine for each k from 1 to n whether the values 1 through k occupy a contiguous segment in the permutation.
Output a binary array where each entry indicates if the corresponding prefix set forms a valid contiguous subarray.
The large constraint (up to 10^5) demands an O(n) time solution rather than brute-force subarray checks.
What This Tests
Index mapping and constant-time lookups
Contiguous range validation via span analysis
Iterative state tracking with min/max boundaries
Algorithmic efficiency under tight constraints
Common Patterns
Hashing
Greedy
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