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.
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Problems 2,401–2,500 of 3,736
- 2401. Exactly K Flights Medium · Graph, Dynamic Programming
- 2402. Shortest Path With Debts Medium · Graph, Topological Sort, Dynamic Programming
- 2403. Downhill Route Count Medium · Graph, Heap (Priority Queue), Dynamic Programming, Sorting
- 2404. Nearest Clinic for Each Village Medium · Graph, Heap (Priority Queue)
- 2405. Network Goes Quiet Medium · Graph, Breadth-First Search, Math
- 2406. Videos Watched by K-Step Friends Medium · Graph, Breadth-First Search, Hash Table, Sorting
- 2407. Hop Home Around the Traps Medium · Graph, Breadth-First Search
- 2408. Number Transformer Medium · Graph, Breadth-First Search
- 2409. Rotate and Add Puzzle Medium · Graph, Breadth-First Search, String
- 2410. Same Label Descendants Medium · Graph, Depth-First Search, Tree, Counting
- 2411. Harvest the Ripe Fruit Medium · Graph, Depth-First Search, Tree
- 2412. Weakest Link Between Ends Medium · Graph, Union Find, Depth-First Search
- 2413. Four Flower Beds Medium · Graph, Greedy
- 2414. K-Colour the Map Medium · Graph, Backtracking
- 2415. Token Game on a DAG Medium · Graph, Memoization, Depth-First Search
- 2416. Manager K Levels Up Medium · Graph, Tree, Dynamic Programming, Bit Manipulation
- 2417. Ancestor Check Queries Medium · Graph, Depth-First Search, Tree
- 2418. Strongly Linked Check Medium · Graph, Depth-First Search
- 2419. Count the Triangles Medium · Graph, Hash Table
- 2420. Best Warehouse Location Medium · Graph, Breadth-First Search
- 2421. Open Every Vault Medium · Graph, Depth-First Search
- 2422. Loop Length in the Signposts Medium · Graph, Array
- 2423. Ring Around Each Node Medium · Graph, Breadth-First Search
- 2424. Signals on Two Frequencies Medium · Graph, Breadth-First Search
- 2425. Shortest Loop Through a Node Medium · Graph, Breadth-First Search
- 2426. Lexicographically First Shortest Route Medium · Graph, Breadth-First Search
- 2427. Directed Reach Within K Medium · Graph, Breadth-First Search
- 2428. Bipartite Team Sizes Medium · Graph, Breadth-First Search, Dynamic Programming
- 2429. Grid Teleporters Medium · Graph, Breadth-First Search, Matrix, Hash Table
- 2430. Lights Out Switchboard Medium · Graph, Breadth-First Search, Bit Manipulation
- 2431. Rhyme Families Medium · Graph, Union Find, Hash Table, String
- 2432. Chain of Overlapping Meetings Medium · Graph, Union Find, Sorting
- 2433. Transit Between Lines Medium · Graph, Breadth-First Search, Hash Table
- 2434. Arrive Before Closing Medium · Graph, Heap (Priority Queue)
- 2435. Minimum Hops With Jump Boots Medium · Graph, Breadth-First Search, Matrix
- 2436. Gem Cut Equivalence Medium · Graph, Union Find, Math
- 2437. Seat the Council in a Ring Medium · Graph, Backtracking
- 2438. Reopen the Stations Medium · Graph, Union Find
- 2439. Checkerboard Neighbour Teams Medium · Graph, Breadth-First Search, Matrix
- 2440. Rumour With Delays Medium · Graph, Heap (Priority Queue)
- 2441. Plan the Three-Stop Day Medium · Graph, Heap (Priority Queue)
- 2442. Cut the Tree Into Equal Sums Medium · Graph, Depth-First Search, Tree
- 2443. Tree Height From Every Root Medium · Graph, Depth-First Search, Tree, Dynamic Programming
- 2444. Explore Until the Gate Closes Easy · Graph, Breadth-First Search
- 2445. Exact-Toll Path Medium · Graph, Backtracking, Depth-First Search
- 2446. Balance the Tokens on the Tree Medium · Graph, Depth-First Search, Tree
- 2447. Richest Root-to-Leaf Trail Easy · Graph, Breadth-First Search, Tree
- 2448. Fewest Broadcast Towers Medium · Graph, Depth-First Search, Topological Sort
- 2449. Valid Edge Sequence Easy · Graph, Hash Table
- 2450. Add Streets for a Full Sweep Hard · Graph, Depth-First Search, Union Find, Math
- 2451. Shortest Escape Before Flooding Medium · Graph, Breadth-First Search, Matrix
- 2452. Cheapest Ride Within the Time Limit Medium · Graph, Heap (Priority Queue)
- 2453. Remove One Hub Medium · Graph, Depth-First Search
- 2454. Merge Shared-Member Groups Medium · Graph, Union Find, Hash Table
- 2455. Path to the Treasure Room Medium · Graph, Breadth-First Search, Matrix
- 2456. Road Trip With Refuels Medium · Graph, Heap (Priority Queue)
- 2457. Leaders With Loyal Followers Easy · Graph, Counting
- 2458. Roads on Some Fastest Route Medium · Graph, Heap (Priority Queue)
- 2459. Distance Between Two Cabins Queries Medium · Graph, Breadth-First Search, Tree
- 2460. Separate the Capitals Medium · Graph, Union Find, Sorting, Greedy
- 2461. Fewest Turns Through the Maze Medium · Graph, Breadth-First Search, Matrix, Queue
- 2462. Basin Sizes in a Height Map Medium · Graph, Depth-First Search, Matrix, Memoization
- 2463. Path Farthest From the Guards Hard · Graph, Breadth-First Search, Heap (Priority Queue), Matrix
- 2464. Longest Uphill Trail Hard · Graph, Depth-First Search, Matrix, Memoization
- 2465. Mow Every Patch Once Hard · Graph, Backtracking, Matrix
- 2466. Keys to Every Lock Hard · Graph, Breadth-First Search, Bit Manipulation, Matrix
- 2467. Gates That Open Late Hard · Graph, Heap (Priority Queue), Matrix
- 2468. Warehouse Crate Shove Hard · Graph, Breadth-First Search, Heap (Priority Queue), Matrix
- 2469. Six-Tile Slider Hard · Graph, Breadth-First Search, String, Hash Table
- 2470. Two-Cell Caterpillar Hard · Graph, Breadth-First Search, Matrix
- 2471. Tightest Loop in the Network Hard · Graph, Breadth-First Search
- 2472. Most Layers of Neighbours Hard · Graph, Breadth-First Search, Union Find
- 2473. Reversals for Every Capital Hard · Graph, Depth-First Search, Dynamic Programming
- 2474. Total Distance From Every Cabin Hard · Graph, Depth-First Search, Tree, Dynamic Programming
- 2475. Recover the Secret Alphabet Hard · Graph, Topological Sort, String
- 2476. The Extra One-Way Road Hard · Graph, Union Find, Depth-First Search
- 2477. Shared Roads for Two Couriers Hard · Graph, Union Find, Greedy
- 2478. Light Loads Only Hard · Graph, Union Find, Sorting
- 2479. Cities Sharing Big Divisors Hard · Graph, Union Find, Math
- 2480. Trails Starting and Ending at the Peak Hard · Graph, Union Find, Sorting, Tree
- 2481. Wells or Pipes for Every House Hard · Graph, Union Find, Sorting, Greedy
- 2482. Essential and Optional Spanning Edges Hard · Graph, Union Find, Sorting
- 2483. Partners Sitting Together Hard · Graph, Union Find, Greedy
- 2484. Second Fastest Arrival With Signals Hard · Graph, Breadth-First Search
- 2485. Two Couriers One Depot Hard · Graph, Heap (Priority Queue)
- 2486. Touch Every Node Fast Hard · Graph, Breadth-First Search, Bit Manipulation
- 2487. Delivery Round Trip Hard · Graph, Dynamic Programming, Bit Manipulation
- 2488. Fill In the Unknown Road Lengths Hard · Graph, Heap (Priority Queue), Greedy
- 2489. Group-Then-Item Ordering Hard · Graph, Topological Sort
- 2490. Place Numbers by Row and Column Rules Hard · Graph, Topological Sort, Matrix
- 2491. Longest Path Without Repeating Neighbours Hard · Graph, Depth-First Search, Tree
- 2492. Most Frequent Colour on Any Route Hard · Graph, Topological Sort, Dynamic Programming
- 2493. Mutually Reachable Clubs Medium · Graph, Depth-First Search
- 2494. Single Points of Failure Hard · Graph, Depth-First Search
- 2495. Use Every Flight Once Hard · Graph, Depth-First Search, Sorting
- 2496. Chain the Dominoes Hard · Graph, Depth-First Search, Hash Table
- 2497. Shortest Code Covering Every PIN Hard · Graph, Depth-First Search, String, Greedy
- 2498. Interns to Projects Hard · Graph, Depth-First Search
- 2499. Maximum Throughput of the Pipeline Hard · Graph, Breadth-First Search
- 2500. Fewest Patrol Routes Hard · Graph, Depth-First Search
