Coding interview problems

3,736 problems: 937 Easy, 1,914 Medium, 885 Hard. Each runs against hidden tests, in 13 languages; database problems in SQL. Free for members.

Solve them in the app Explore guides

Problems 1,701–1,800 of 3,736

1701. Insertions to Embed a Sequence Hard · Array, Hash Table, Binary Search, Greedy
1702. Carve a Ridge Hard · Array, Binary Search, Dynamic Programming, Greedy
1703. Best Rectangle Under a Ceiling Hard · Array, Binary Search, Matrix, Prefix Sum
1704. Trailing Zero Preimages Hard · Math, Binary Search
1705. All-Ones Base Hard · Math, Binary Search
1706. Corner Block Pile Hard · Math, Binary Search, Greedy
1707. Split Chores Among Workers Hard · Array, Binary Search, Backtracking, Bit Manipulation
1708. Orchard Walk Within Steps Hard · Array, Binary Search, Sliding Window, Prefix Sum
1709. Brightest Weakest District Hard · Array, Binary Search, Greedy, Sliding Window, Queue
1710. Hens and Grain Hard · Array, Two Pointers, Binary Search, Sorting
1711. K-th Product of Two Sorted Lists Hard · Array, Binary Search
1712. Assign Tasks With Boost Pills Hard · Array, Binary Search, Greedy, Sorting, Queue
1713. Courses Before Deadlines Hard · Array, Greedy, Sorting, Heap (Priority Queue)
1714. Cheapest Crew of K Hard · Array, Greedy, Sorting, Heap (Priority Queue)
1715. Earliest Full Harvest Hard · Array, Greedy, Sorting
1716. Starting Stamina for All Trials Hard · Array, Greedy, Sorting
1717. Weighted Levelling Cost Hard · Array, Binary Search, Greedy, Sorting, Prefix Sum
1718. Most Chunks With Repeats Hard · Array, Stack, Greedy, Sorting, Monotonic Stack
1719. Raise the Ladder Hard · Array, Binary Search, Dynamic Programming, Sorting
1720. Near Twins Nearby Hard · Array, Sliding Window, Sorting, Hash Table
1721. Make a Gapless Run Hard · Array, Hash Table, Binary Search, Sliding Window
1722. Tallest Crate Stack Hard · Array, Dynamic Programming, Sorting
1723. Doubled Window Medians Hard · Array, Sliding Window, Sorting, Heap (Priority Queue)
1724. Fewest Egg Trials Hard · Math, Binary Search, Dynamic Programming
1725. Growing Team Rounds Hard · Array, Math, Binary Search, Greedy, Sorting
1726. Closest Subset Total Hard · Array, Two Pointers, Bit Manipulation, Sorting, Binary Search
1727. Tallest Towers Under Zoning Hard · Array, Math, Sorting
1728. Best Average of Long Runs Hard · Array, Binary Search, Prefix Sum
1729. Median of Distinct Counts Hard · Array, Hash Table, Binary Search, Sliding Window
1730. Time to Shrink the Total Hard · Array, Dynamic Programming, Sorting
1731. Dominant Pair Queries Hard · Array, Binary Search, Sorting, Stack, Monotonic Stack
1732. Nearest Adequate Room Hard · Array, Binary Search, Sorting
1733. Shortest Slot for Each Query Hard · Array, Binary Search, Sorting, Heap (Priority Queue)
1734. Rebuild From Shifted Copies Hard · Array, Hash Table, Sorting, Two Pointers
1735. Rebuild From Subset Totals Hard · Array, Divide and Conquer, Sorting
1736. Parity-Matched Similarity Hard · Array, Greedy, Sorting
1737. Marble Bag Spread Hard · Array, Greedy, Sorting, Heap (Priority Queue)
1738. Robots to Repair Bays Hard · Array, Dynamic Programming, Sorting
1739. Trim a Segment to Sort Hard · Array, Two Pointers, Binary Search
1740. Floored Ratio Total Hard · Array, Math, Binary Search, Prefix Sum
1741. Guards on a Square Fence Hard · Array, Binary Search, Greedy, Sorting
1742. Count Strictly Increasing Picks Hard · Array, Binary Search, Divide and Conquer, Sorting
1743. Least Edits to Make Monotone Hard · Array, Greedy, Heap (Priority Queue), Sorting
1744. Sort With One Empty Slot Hard · Array, Greedy, Sorting, Graph
1745. K-th Smallest Run Maximum Hard · Array, Binary Search, Two Pointers
1746. Sort by Prefix Reversals Count Medium · Array, Breadth-First Search, Sorting
1747. Sort With Distance-Limited Swaps Hard · Array, Union Find, Sorting
1748. Gather K Flags Side by Side Hard · Array, Greedy, Sliding Window, Prefix Sum
1749. Total Imbalance of Runs Hard · Array, Hash Table, Sorting
1750. Runs With Median K Hard · Array, Hash Table, Prefix Sum, Counting
1751. Fill Blanks With Two Values Hard · Array, Binary Search, Greedy
1752. Range of Sorted Run Sums Hard · Array, Binary Search, Two Pointers, Prefix Sum
1753. Earliest Second All Marked Medium · Array, Binary Search
1754. Garden Beauty With Extra Seeds Hard · Array, Two Pointers, Binary Search, Greedy, Sorting, Prefix Sum
1755. Drop One Point to Shrink the Spread Hard · Array, Math, Sorting
1756. Maximum Depth of Binary Tree Easy · Tree, Binary Tree, Depth-First Search, Breadth-First Search · Asked at Amazon, LinkedIn
1757. Invert Binary Tree Easy · Tree, Binary Tree, Depth-First Search, Breadth-First Search · Asked at Google, Amazon
1758. Symmetric Tree Easy · Tree, Binary Tree, Depth-First Search, Breadth-First Search · Asked at Amazon, Microsoft, Bloomberg
1759. Binary Tree Level Order Traversal Medium · Tree, Binary Tree, Breadth-First Search · Asked at Amazon, Meta, Microsoft
1760. Validate Binary Search Tree Medium · Tree, Binary Tree, Binary Search Tree, Depth-First Search · Asked at Amazon, Meta, Microsoft
1761. Kth Smallest Element in a BST Medium · Tree, Binary Tree, Binary Search Tree, Depth-First Search · Asked at Amazon, Google, Uber
1762. Construct Binary Tree from Preorder and Inorder Traversal Medium · Array, Hash Table, Divide and Conquer, Binary Tree · Asked at Amazon, Microsoft, Bloomberg
1763. Binary Tree Maximum Path Sum Hard · Tree, Binary Tree, Depth-First Search, Dynamic Programming · Asked at Meta, Google, Amazon
1764. Binary Tree Cameras Hard · Tree, Binary Tree, Depth-First Search, Dynamic Programming, Greedy · Asked at Google
1765. Count Every Node in the Orchard Easy · Tree, Binary Tree, Depth-First Search, Recursion
1766. Read the Rows in Snake Order Medium · Tree, Binary Tree, Breadth-First Search
1767. Rows from the Ground Up Medium · Tree, Binary Tree, Breadth-First Search
1768. What You See from the East Side Medium · Tree, Binary Tree, Breadth-First Search, Depth-First Search
1769. Insertion Orders Giving the Same BST Hard · Tree, Binary Search Tree, Divide and Conquer, Dynamic Programming, Math
1770. Mirror Image Pair Easy · Tree, Binary Tree, Depth-First Search, Breadth-First Search
1771. Count the Bare Twigs Easy · Tree, Binary Tree, Depth-First Search
1772. Shallowest Leaf Depth Easy · Tree, Binary Tree, Breadth-First Search
1773. Largest Value Anywhere in the Tree Easy · Tree, Binary Tree, Depth-First Search
1774. Total of Leaves Hanging on the Left Easy · Tree, Binary Tree, Depth-First Search
1775. Are Two Trees Exact Copies Easy · Tree, Binary Tree, Depth-First Search, Recursion
1776. Is the Value Somewhere in the Tree Easy · Tree, Binary Tree, Depth-First Search, Breadth-First Search
1777. Find a Key in a Sorted Tree Easy · Tree, Binary Search Tree, Binary Tree
1778. Place a New Key in a BST Easy · Tree, Binary Search Tree, Binary Tree
1779. Smallest Gap Between Two Tags Easy · Tree, Binary Search Tree, Binary Tree, Depth-First Search
1780. Total of Tags Inside a Window Easy · Tree, Binary Search Tree, Binary Tree, Depth-First Search
1781. Visit Order: Node Before Children Easy · Tree, Binary Tree, Depth-First Search, Stack
1782. Visit Order: Left, Node, Right Easy · Tree, Binary Tree, Depth-First Search, Stack
1783. Visit Order: Children Before Node Easy · Tree, Binary Tree, Depth-First Search, Stack
1784. Is the Tree on an Even Keel Easy · Tree, Binary Tree, Depth-First Search
1785. Longest Span Between Two Nodes Easy · Tree, Binary Tree, Depth-First Search
1786. Does Any Branch Hit the Target Easy · Tree, Binary Tree, Depth-First Search
1787. Spell Out Every Branch Easy · Tree, Binary Tree, Depth-First Search, Backtracking, String
1788. Overlay Two Orchards Easy · Tree, Binary Tree, Depth-First Search, Recursion
1789. Do All Nodes Carry One Value Easy · Tree, Binary Tree, Depth-First Search
1790. Build a Balanced Index from Sorted IDs Easy · Tree, Binary Search Tree, Binary Tree, Divide and Conquer, Array
1791. Is One Tree Hidden Inside Another Easy · Tree, Binary Tree, Depth-First Search
1792. Are the Two Nodes Cousins Easy · Tree, Binary Tree, Breadth-First Search
1793. Total of Each Row Easy · Tree, Binary Tree, Breadth-First Search
1794. Do Two Trees Share a Leaf Row Easy · Tree, Binary Tree, Depth-First Search
1795. Total Imbalance Score Easy · Tree, Binary Tree, Depth-First Search
1796. Most Frequent Tags in a BST Easy · Tree, Binary Search Tree, Binary Tree, Depth-First Search
1797. Two Tags That Add Up Easy · Tree, Binary Search Tree, Binary Tree, Hash Table
1798. Unroll a BST into a Chain Easy · Tree, Binary Search Tree, Binary Tree, Depth-First Search
1799. Parent Equals Its Children's Total Easy · Tree, Binary Tree, Depth-First Search
1800. Evaluate a Logic Gate Tree Easy · Tree, Binary Tree, Depth-First Search, Recursion