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Coding practice

Solve coding exercises in JavaScript, Python, C++, or Java with in-browser tests.

10 of 10 exercises

  1. Minimum Window Substring

    • strings
    • sliding window
    • hash maps
    Advanced30 min

  2. LRU Cache

    • object oriented design
    • hash maps
    • linked lists
    Advanced45 min

  3. Invert Binary Tree

    • binary trees
    • recursion
    • depth first search
    Beginner20 min

  4. Clone Graph

    • graphs
    • depth first search
    • breadth first search
    Intermediate30 min

  5. Reverse Linked List

    • linked lists
    • iteration
    Beginner15 min

  6. Course Schedule

    • graphs
    • topological sort
    • cycle detection
    Intermediate25 min

  7. Network Delay Time

    • graphs
    • shortest paths
    • dijkstra
    Intermediate30 min

  8. Number of Provinces

    • graphs
    • matrices
    • connected components
    • depth first search
    • breadth first search
    • union find
    Intermediate20 min

  9. Number of Islands

    • graphs
    • matrices
    • flood fill
    • depth first search
    Intermediate25 min

  10. Longest Cycle in a Graph

    • graphs
    • cycle detection
    Advanced35 min