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Coding Pattern Practice

focus on the most important coding patterns and practice efficiently — without grinding through thousands of random coding questions.

19 patterns · 190 questions

1Find Pair With Target SumReturn the indices of two values whose sum equals the target.easy20 min 2Contains DuplicateDetermine whether any value appears more than once in an integer array.easy10 min 3Valid AnagramCheck whether two strings contain exactly the same character frequencies.easy12 min 4Group AnagramsGroup strings that share the same character-frequency signature.medium25 min 5Top K Frequent ElementsReturn the k values with the highest frequencies using a hash-based count.medium25 min 6Product of Array Except SelfBuild each index product without division using prefix and suffix accumulation.medium25 min 7Valid SudokuValidate row, column, and 3-by-3 box uniqueness with hash sets.medium30 min 8Longest Consecutive SequenceFind the longest consecutive-value run in expected linear time.medium30 min 9First Missing PositiveFind the smallest absent positive integer using in-place index hashing.hard40 min 10Max Points on a LineUse normalized slope keys to find the largest collinear point set.hard45 min