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DSA
Data Structures and Algorithms
76 challenges · Practitioner to Specialty
18 Easy
30 Medium
28 Hard
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All Data Structures and Algorithms challenges
Big-O of binary search
Easy
Free
+10 XP
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Hash map lookup
Easy
Free
+10 XP
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Nested loops
Easy
Free
+10 XP
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Merge sort time
Medium
Free
+15 XP
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Quicksort worst case
Hard
Free
+20 XP
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Space of recursion
Medium
Free
+15 XP
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Constant time
Easy
Free
+10 XP
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Amortized
Hard
Free
+20 XP
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LIFO structure
Easy
Free
+10 XP
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FIFO structure
Easy
Free
+10 XP
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Priority retrieval
Medium
Free
+15 XP
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BST property
Medium
Free
+15 XP
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Balanced tree height
Hard
Free
+20 XP
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Hash collision
Medium
Free
+15 XP
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Linked list insert
Medium
Free
+15 XP
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Trie use
Hard
Free
+20 XP
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Union-Find
Hard
Free
+20 XP
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Stack operations
Easy
Free
+10 XP
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BFS structure
Medium
Free
+15 XP
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DFS structure
Medium
Free
+15 XP
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Shortest path (weighted)
Hard
Free
+20 XP
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Negative weights
Hard
Free
+20 XP
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MST algorithm
Hard
Free
+20 XP
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Divide and conquer
Medium
Free
+15 XP
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DP idea
Hard
Free
+20 XP
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Greedy validity
Hard
Free
+20 XP
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Two pointers
Medium
Free
+15 XP
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Sliding window
Medium
Free
+15 XP
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Backtracking
Hard
Free
+20 XP
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Stable sort
Hard
Free
+20 XP
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Sum a list (Py)
Easy
Free
+10 XP
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Reverse a string (Py)
Easy
Free
+10 XP
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Is palindrome (Py)
Easy
Free
+10 XP
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Factorial (Py)
Easy
Free
+10 XP
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Max in list (Py)
Easy
Free
+10 XP
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Count vowels (Py)
Medium
Free
+15 XP
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FizzBuzz value (Py)
Medium
Free
+15 XP
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Is prime (Py)
Medium
Free
+15 XP
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GCD (Py)
Medium
Free
+15 XP
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Two sum exists (Py)
Hard
Free
+20 XP
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Fibonacci (Py)
Medium
Free
+15 XP
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Binary search (Py)
Hard
Free
+20 XP
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Count distinct (Py)
Medium
Free
+15 XP
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Anagram check (Py)
Hard
Free
+20 XP
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Sum two (JS)
Easy
Free
+10 XP
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Max of array (JS)
Easy
Free
+10 XP
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Reverse string (JS)
Easy
Free
+10 XP
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Count evens (JS)
Medium
Free
+15 XP
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Factorial (JS)
Medium
Free
+15 XP
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Palindrome (JS)
Medium
Free
+15 XP
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Sum array (JS)
Easy
Free
+10 XP
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Heap insert time
Medium
Free
+15 XP
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Heapsort time
Hard
Free
+20 XP
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Linear-time sort
Hard
Free
+20 XP
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Topological sort
Hard
Free
+20 XP
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Cycle detection
Hard
Free
+20 XP
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Graph representation
Medium
Free
+15 XP
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String matching
Hard
Free
+20 XP
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LCS problem
Hard
Free
+20 XP
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Knapsack
Hard
Free
+20 XP
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@malathi-shetty
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