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Coding interview problems

150 problems. Filter by topic or difficulty, then solve one in your browser.

Showing 1 to 20 of 20
29Jewels and StonesBeginner
31Valid AnagramEasy
32Contains DuplicateEasy
38Majority ElementEasy
52Intersection of Two ArraysEasy
53Happy NumberEasy
66Next Greater Element IEasy
68Roman to IntegerEasy
72First Unique Character in a StringEasy
78Two SumEasy
85Permutation in StringMedium
87Subarray Sum Equals KMedium
89Group AnagramsMedium
90Top K Frequent ElementsMedium
91Longest Consecutive SequenceMedium
92Valid SudokuMedium
104Partition LabelsMedium
109Word BreakMedium
132Longest Substring Without Repeating CharactersMedium
139Minimum Window SubstringHard
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