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Problem Difficulty Topics 1 01 Matrix Medium ArrayDynamic ProgrammingBreadth-First Search 2 1-bit and 2-bit Characters Easy Array 3 132 Pattern Medium ArrayBinary SearchStack 4 2 Keys Keyboard Medium MathDynamic Programming 5 24 Game Hard ArrayMathBacktracking 6 3Sum Medium ArrayTwo PointersSorting 7 3Sum Closest Medium ArrayTwo PointersSorting 8 3Sum Smaller Medium ArrayTwo PointersBinary Search 9 3Sum With Multiplicity Medium ArrayHash TableTwo Pointers 10 4 Keys Keyboard Medium MathDynamic Programming 11 4Sum Medium ArrayTwo PointersSorting 12 4Sum II Medium ArrayHash Table 13 A Number After a Double Reversal Easy Math 14 Abbreviating the Product of a Range Hard Math 15 Accepted Candidates From the Interviews Medium Database Showing 1-15 of 3600 1 2 3 ... 240 Tutorials Library Master any technology with our largest free online Library. 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