100 Patterns

DSA Topics

Learn each algorithm / pattern name first — then solve problems.

  1. 1.Time & Space Complexity
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  2. 2.Arrays
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  3. 3.Strings
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  4. 4.Hashing / Hash Map / Hash Set
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  1. 5.Two Pointers
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  2. 6.Sliding Window
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  3. 7.Prefix Sum
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  4. 8.Difference Array
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  1. 9.Sorting
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  2. 10.Binary Search
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  3. 11.Binary Search on Answer
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  1. 12.Matrix Traversal
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  2. 13.Linked List
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  3. 14.Fast & Slow Pointers
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  4. 15.Stack
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  5. 16.Monotonic Stack
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  6. 17.Queue
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  7. 18.Deque
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  8. 19.Monotonic Queue
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  1. 20.Recursion
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  2. 21.Backtracking
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  3. 22.Subsets / Power Set
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  4. 23.Permutations
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  5. 24.Combinations
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  1. 25.Divide and Conquer
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  2. 26.Merge Sort
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  3. 27.Quick Sort
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  1. 28.Heap / Priority Queue
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  2. 29.Top K Elements
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  3. 30.Intervals
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  4. 31.Merge Intervals
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  1. 32.Greedy Algorithms
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  2. 33.Kadane's Algorithm
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  3. 34.Bit Manipulation
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  4. 35.XOR Tricks
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