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Problems5

All SourcesLeetCodeCodeforcesBOJCustom
All LevelsEasyMediumHard
hash
Custom#cpq003
1800

Distinct K-Difference Substrings

Phase 6 / string/hash

stringhashsubstringset
Custom#cp005
1600

Sequence Periodic Repeats

Phase 5 / string, array, hashing, two pointers

stringarrayhashperiodicity
Custom#P015
1500

Unordered Pair Palindromic Concatenation

Phase 2 / String, Hashing

stringpalindromehash
Custom#P012
1900

Subarray Distinct Product Modulo

Phase 2 / Subarray, Hashing, Math

subarraymathhash
Custom#P007
1800

Unique Value Submatrix Count

Phase 2 / 2D Sliding Window, Hashing

2d arraycountinghash