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String manipulation and DP dominate reports, with an OOP/design-patterns conversation for product teams.

13 DSA problems · 2 system-design prompts · compiled from publicly shared interview experiences; exact questions vary between loops.

Longest Palindromic SubstringMediumStringsVery common
stringdynamic-programmingtwo-pointers
String to Integer (atoi)MediumStringsVery common
Edge-case discipline is what's being graded.stringsimulation
Coin ChangeMediumDynamic ProgrammingVery common
dynamic-programmingbfsarray
Design Patterns for InterviewsVery common
Expect concrete patterns questions (observer, factory, singleton).
Roman to IntegerEasyStringsCommon
stringhash-tablemath
Zigzag ConversionMediumStringsCommon
stringsimulation
Valid ParenthesesEasyStringsCommon
stringstack
Climbing StairsEasyDynamic ProgrammingCommon
dynamic-programmingmathmemoization
Decode WaysMediumDynamic ProgrammingCommon
dynamic-programmingstring
Maximum Product SubarrayMediumArraysCommon
arraydynamic-programming
Design Typeahead / AutocompleteCommon
PermutationsMediumBacktrackingOccasional
backtrackingrecursion
Daily TemperaturesMediumStacks & QueuesOccasional
stackmonotonic-stackarray
Largest Rectangle in HistogramHardStacks & QueuesOccasional
Hard-round stack classic.stackmonotonic-stackarray
Letter Combinations of a Phone NumberMediumBacktrackingOccasional
backtrackingstringhash-table