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 701–800 of 3,736

701. Swap to Merge Two Shelves Medium · Array, Two Pointers, Sorting
702. Distinct Three-Letter Mirrors Medium · String, Hash Table, Two Pointers
703. Sentences One Insertion Apart Medium · String, Two Pointers
704. Heater Radius for Cottages Medium · Array, Two Pointers, Sorting, Binary Search
705. N-th Number Built From 3, 5 and 7 Medium · Math, Dynamic Programming, Two Pointers
706. Compare Firmware Versions Medium · String, Two Pointers
707. Ring Seating With the Smallest Jump Medium · Array, Sorting, Greedy
708. Docks Needed at the Harbour Medium · Array, Two Pointers, Sorting
709. Equal Prefix and Suffix Loads Medium · Array, Two Pointers, Greedy
710. Pair Reaching a Threshold Medium · Array, Two Pointers, Sorting
711. Multiply Run-Length Lists Medium · Array, Two Pointers
712. Pairs in a Turned Sorted List Medium · Array, Two Pointers, Binary Search
713. Same After One Reversal Medium · String, Two Pointers
714. Chargers Within Reach Medium · Array, Two Pointers, Sorting, Binary Search, Greedy
715. Count Sums of Two Others Medium · Array, Two Pointers, Sorting
716. Right-Angle Stick Triples Medium · Array, Two Pointers, Math, Sorting
717. Fewest Changes to a Periodic Mirror Medium · String, Two Pointers, Counting, Greedy
718. Insert Missing Beats Medium · String, Two Pointers, Greedy
719. Equalize Two Dice Totals Medium · Array, Greedy, Two Pointers, Counting
720. Move to Front to Match Medium · String, Two Pointers, Greedy
721. Evenly Spaced Value Triples Medium · Array, Two Pointers
722. Pair the Chopsticks Medium · Array, Sorting, Greedy
723. Three Matching Bit Segments Hard · Array, Two Pointers, Math
724. K-th Smallest Cross Product Hard · Array, Binary Search, Two Pointers
725. Strongest Segment Around k Hard · Array, Two Pointers, Greedy, Stack
726. K-th Smallest Pair Total at Scale Hard · Array, Binary Search, Two Pointers
727. Count Mirror Substrings at Scale Hard · String, Two Pointers, Dynamic Programming
728. Two Odd Mirrors Max Product Hard · String, Two Pointers, Dynamic Programming
729. Mirror With k Deletions Hard · String, Dynamic Programming, Two Pointers
730. Total Spread of All Subsets Hard · Array, Math, Sorting
731. Longest Prefix-Suffix Mirror Hard · String, Two Pointers
732. Market Haul Within a Step Budget Hard · Array, Two Pointers, Prefix Sum, Binary Search
733. Lifts With Limited Tonics Hard · Array, Binary Search, Greedy, Queue, Sorting
734. Best Pair With a Distance Cap Hard · Array, Queue, Sliding Window
735. Budget Quadruples Hard · Array, Two Pointers, Sorting
736. Bounded Extremes Stretches Hard · Array, Two Pointers
737. Flower Bed Showcase Hard · Array, Two Pointers, Sorting, Binary Search, Prefix Sum, Greedy
738. Count Removable Blocks Hard · Array, Two Pointers, Binary Search
739. Reunion Square on the Grid Hard · Matrix, Math, Sorting, Two Pointers
740. Gather the Tokens Tightly Hard · Array, Two Pointers, Sorting, Sliding Window
741. Telescope Field of View Hard · Array, Math, Sorting, Two Pointers, Sliding Window
742. Closest Pair of Towers Hard · Array, Divide and Conquer, Sorting, Math
743. Weighted Stretches Under a Cap Hard · Array, Two Pointers, Sliding Window, Prefix Sum
744. Cheapest Sheet Slicing Hard · Array, Greedy, Sorting, Two Pointers
745. Make Shelves Alike Hard · Array, Greedy, Sorting
746. Climb Picking From Both Ends Hard · Array, Two Pointers, Greedy
747. Busy Node Pairs Hard · Graph, Two Pointers, Sorting, Binary Search
748. Least Packing Waste Hard · Array, Binary Search, Sorting, Prefix Sum
749. k Mirror Parts With Fewest Edits Hard · String, Dynamic Programming, Two Pointers
750. Longest Near Mirror Medium · String, Two Pointers
751. Everyone's Free Time Medium · Array, Sorting, Intervals, Two Pointers
752. Blooms at Visit Time Medium · Array, Sorting, Two Pointers, Binary Search
753. Windows With Few Inversions Hard · Array, Two Pointers, Sliding Window
754. Adjacent Swaps to an Anagram Hard · String, Greedy, Two Pointers
755. Most Equal With Moves Both Ways Hard · Array, Sorting, Two Pointers, Prefix Sum, Binary Search
756. Night Bridge Crossing Hard · Array, Greedy, Sorting, Two Pointers
757. Pair Sums Modulo Under a Cap Medium · Array, Two Pointers, Sorting, Math
758. Distinct Mirror Subsequences Hard · String, Dynamic Programming, Two Pointers
759. Not Yet Returned Books Easy · Array, Two Pointers
760. Two-Voice Transcript Easy · String, Two Pointers
761. Pair Sums in Range Across Lists Medium · Array, Two Pointers, Sorting
762. Widest Gap Across Shelves Medium · Array, Greedy
763. Ordered Picks From Three Shelves Medium · Array, Two Pointers, Sorting, Prefix Sum
764. Neighbours Within Reach Medium · Array, Two Pointers, Sorting
765. Turn Into a Mirror Medium · String, Two Pointers
766. Order by Distance From Home Medium · Array, Two Pointers, Binary Search
767. Best Single Reversal Medium · String, Two Pointers, Greedy
768. Two-Mirror Split Medium · String, Two Pointers, Dynamic Programming
769. Subsequence With One Typo Medium · String, Two Pointers
770. Same Coverage Check Medium · Array, Two Pointers, Intervals, Sorting
771. Tight Flock Medium · Array, Two Pointers, Sorting
772. Shop From Both Aisle Ends Medium · Array, Two Pointers, Greedy
773. Pop Order From Both Ends Medium · Array, Dynamic Programming, Two Pointers
774. Shortest Merged Roster Medium · String, Two Pointers
775. Line Up the Smallest Name Medium · String, Two Pointers, Greedy
776. Badge Initials Match Medium · String, Two Pointers
777. Fewest Copies to Hide a Word Medium · String, Two Pointers, Greedy, Binary Search
778. Trade One Snack Medium · Array, Two Pointers, Sorting, Math
779. Contained Sessions Medium · Array, Two Pointers, Intervals
780. Two-Ends Snack Race Medium · Array, Two Pointers, Simulation
781. Slide the Beads Medium · Array, Two Pointers, Greedy
782. Cut Out to All Distinct Medium · Array, Two Pointers, Hash Table
783. Mirrored Sum Chunks Medium · Array, Two Pointers, Greedy
784. Lattice Points Inside a Disc Medium · Math, Two Pointers
785. Longest Chain by One Letter Medium · String, Dynamic Programming, Two Pointers, Sorting
786. Richest Mirror Subsequence Hard · Array, Dynamic Programming, Two Pointers
787. Three Mirror Pieces Hard · String, Dynamic Programming, Two Pointers
788. Smoothest Zipper Merge Hard · Array, Dynamic Programming, Two Pointers
789. Longest Near Match Under Shift Hard · String, Two Pointers, Sliding Window
790. Sort by Sending to Ends Hard · Array, Two Pointers, Sorting, Dynamic Programming
791. Pair Red and Blue Posts Medium · Array, Sorting, Greedy
792. Tight k-Squads Medium · Array, Two Pointers, Sorting, Math
793. m Tarps on a Line Hard · Array, Dynamic Programming, Two Pointers, Sorting
794. Cheapest Repaint to a Mirror Medium · String, Graph, Two Pointers
795. Fastest Sweep of the Tracks Hard · Array, Binary Search, Greedy, Two Pointers
796. Split Message Pairs Medium · String, Two Pointers, Sorting
797. Up-Down Signal Sequence Medium · Array, String, Two Pointers, Greedy
798. Distance to the Nearest Lamp Easy · Array, String, Two Pointers
799. Planks Over Broken Boards Easy · Array, Greedy, Two Pointers
800. Low-High Alternation Easy · Array, Two Pointers, Sorting