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LeetCode 75Official

LeetCode's official study plan. 75 problems across 20+ topics from basics to advanced. Great for structured preparation.

By FleetCode75 problems22 Easy53 Medium0 Hard2 followersUpdated 23 Mar 2026

Start: Merge Strings Alternately

75problems

22Easy

53Medium

0Hard

Signed in, the sheet shows which of these you have solved.

TitleSolutionAcceptDifficultyTopics

1768. Merge Strings AlternatelyVideo

Solution82.1%Easy

String, Two Pointers· 11 companies

1071. Greatest Common Divisor of StringsVideo

Solution54.1%Easy

Math, String· 7 companies

1431. Kids With the Greatest Number of CandiesVideo

Solution87.8%Easy

Array· 6 companies

605. Can Place FlowersVideo

Solution28.8%Easy

Array, Greedy· 16 companies

345. Reverse Vowels of a StringVideo

Solution62.7%Easy

String, Two Pointers· 13 companies

151. Reverse Words in a StringVideo

Solution57.8%Medium

String, Two Pointers· 30 companies

238. Product of Array Except SelfVideo

Solution69.3%Medium

Array, Prefix Sum· 40 companies

334. Increasing Triplet SubsequenceVideo

Solution39.3%Medium

Array, Greedy· 7 companies

443. String CompressionVideo

Solution60.9%Medium

String, Two Pointers· 41 companies

283. Move ZeroesVideo

Solution64.3%Easy

Array, Two Pointers· 46 companies

392. Is SubsequenceVideo

Solution49.5%Easy

Dynamic Programming, String +1· 16 companies

11. Container With Most WaterVideo

Solution60.9%Medium

Array, Greedy +1· 57 companies

1679. Max Number of K-Sum PairsVideo

Solution57.5%Medium

Array, Hash Table +2· 7 companies

643. Maximum Average Subarray IVideo

Solution49.2%Easy

Array, Sliding Window· 12 companies

1456. Maximum Number of Vowels in a Substring of Given LengthVideo

Solution63.0%Medium

Sliding Window, String· 6 companies

1004. Max Consecutive Ones IIIVideo

Solution68.6%Medium

Array, Binary Search +2· 20 companies

1493. Longest Subarray of 1's After Deleting One ElementVideo

Solution71.7%Medium

Array, Dynamic Programming +1· 8 companies

1732. Find the Highest AltitudeVideo

Solution84.7%Easy

Array, Prefix Sum· 7 companies

724. Find Pivot IndexVideo

Solution64.2%Easy

Array, Prefix Sum· 18 companies

2215. Find the Difference of Two ArraysVideo

Solution81.4%Easy

Array, Hash Table· 7 companies

1207. Unique Number of OccurrencesVideo

Solution78.7%Easy

Array, Hash Table· 5 companies

1657. Determine if Two Strings Are CloseVideo

Solution54.2%Medium

Counting, Hash Table +2· 7 companies

2352. Equal Row and Column PairsVideo

Solution70.9%Medium

Array, Hash Table +2· 6 companies

2390. Removing Stars From a StringVideo

Solution79.7%Medium

Simulation, Stack +1· 4 companies

735. Asteroid CollisionVideo

Solution49.2%Medium

Array, Simulation +1· 32 companies

394. Decode StringVideo

Solution63.0%Medium

Recursion, Stack +1· 40 companies

933. Number of Recent CallsVideo

Solution78.9%Easy

Data Stream, Design +1· 9 companies

649. Dota2 SenateVideo

Solution50.3%Medium

Greedy, Queue +1· 6 companies

2095. Delete the Middle Node of a Linked ListVideo

Solution60.4%Medium

Linked List, Two Pointers· 7 companies

328. Odd Even Linked ListVideo

Solution62.4%Medium

Linked List· 12 companies

206. Reverse Linked ListVideo

Solution81.0%Easy

Linked List, Recursion· 34 companies

2130. Maximum Twin Sum of a Linked ListVideo

Solution83.2%Medium

Linked List, Stack +1· 6 companies

104. Maximum Depth of Binary TreeVideo

Solution78.6%Easy

Binary Tree, Breadth-First Search +2· 17 companies

872. Leaf-Similar TreesVideo

Solution70.0%Easy

Binary Tree, Depth-First Search +1· 5 companies

1448. Count Good Nodes in Binary TreeVideo

Solution73.8%Medium

Binary Tree, Breadth-First Search +2· 7 companies

437. Path Sum IIIVideo

Solution46.6%Medium

Binary Tree, Depth-First Search +1· 11 companies

1372. Longest ZigZag Path in a Binary TreeVideo

Solution67.0%Medium

Binary Tree, Depth-First Search +2· 2 companies

236. Lowest Common Ancestor of a Binary TreeVideo

Solution70.1%Medium

Binary Tree, Depth-First Search +1· 22 companies

199. Binary Tree Right Side ViewVideo

Solution71.5%Medium

Binary Tree, Breadth-First Search +2· 14 companies

1161. Maximum Level Sum of a Binary TreeVideo

Solution70.0%Medium

Binary Tree, Breadth-First Search +2· 4 companies

700. Search in a Binary Search TreeVideo

Solution83.1%Easy

Binary Search Tree, Binary Tree +1· 5 companies

450. Delete Node in a BSTVideo

Solution55.1%Medium

Binary Search Tree, Binary Tree +1· 11 companies

841. Keys and RoomsVideo

Solution76.2%Medium

Breadth-First Search, Depth-First Search +1· 10 companies

547. Number of ProvincesVideo

Solution70.8%Medium

Breadth-First Search, Depth-First Search +2· 9 companies

1466. Reorder Routes to Make All Paths Lead to the City ZeroVideo

Solution66.3%Medium

Breadth-First Search, Depth-First Search +1· 5 companies

399. Evaluate DivisionVideo

Solution64.7%Medium

Array, Breadth-First Search +5· 23 companies

1926. Nearest Exit from Entrance in MazeVideo

Solution49.0%Medium

Array, Breadth-First Search +1· 9 companies

994. Rotting OrangesVideo

Solution59.5%Medium

Array, Breadth-First Search +1· 52 companies

215. Kth Largest Element in an ArrayVideo

Solution69.4%Medium

Array, Divide and Conquer +3· 41 companies

2336. Smallest Number in Infinite SetVideo

Solution70.6%Medium

Design, Hash Table +2· 6 companies

2542. Maximum Subsequence ScoreVideo

Solution54.6%Medium

Array, Greedy +2· 5 companies

2462. Total Cost to Hire K WorkersVideo

Solution43.6%Medium

Array, Heap (Priority Queue) +2· 4 companies

374. Guess Number Higher or LowerVideo

Solution58.5%Easy

Binary Search, Interactive· 6 companies

2300. Successful Pairs of Spells and PotionsVideo

Solution49.5%Medium

Array, Binary Search +2· 7 companies

162. Find Peak ElementVideo

Solution46.8%Medium

Array, Binary Search· 30 companies

875. Koko Eating BananasVideo

Solution50.4%Medium

Array, Binary Search· 47 companies

17. Letter Combinations of a Phone NumberVideo

Solution66.9%Medium

Backtracking, Hash Table +1· 34 companies

216. Combination Sum IIIVideo

Solution73.6%Medium

Array, Backtracking· 4 companies

1137. N-th Tribonacci NumberVideo

Solution63.2%Easy

Dynamic Programming, Math +1· 7 companies

746. Min Cost Climbing StairsVideo

Solution68.7%Easy

Array, Dynamic Programming· 7 companies

198. House RobberVideo

Solution53.6%Medium

Array, Dynamic Programming· 40 companies

790. Domino and Tromino TilingVideo

Solution51.4%Medium

Dynamic Programming· 5 companies

62. Unique PathsVideo

Solution67.3%Medium

Combinatorics, Dynamic Programming +1· 21 companies

1143. Longest Common SubsequenceVideo

Solution59.6%Medium

Dynamic Programming, String· 19 companies

714. Best Time to Buy and Sell Stock with Transaction FeeVideo

Solution72.4%Medium

Array, Dynamic Programming +1· 8 companies

72. Edit DistanceVideo

Solution61.5%Medium

Dynamic Programming, String· 24 companies

338. Counting BitsVideo

Solution80.5%Easy

Bit Manipulation, Dynamic Programming· 9 companies

136. Single NumberVideo

Solution78.1%Easy

Array, Bit Manipulation· 15 companies

1318. Minimum Flips to Make a OR b Equal to cVideo

Solution71.9%Medium

Bit Manipulation· 2 companies

208. Implement Trie (Prefix Tree)Video

Solution69.9%Medium

Design, Hash Table +2· 21 companies

1268. Search Suggestions SystemVideo

Solution65.1%Medium

Array, Binary Search +4· 19 companies

435. Non-overlapping IntervalsVideo

Solution57.5%Medium

Array, Dynamic Programming +2· 18 companies

452. Minimum Number of Arrows to Burst BalloonsVideo

Solution61.9%Medium

Array, Greedy +1· 8 companies

739. Daily TemperaturesVideo

Solution69.1%Medium

Array, Monotonic Stack +1· 32 companies

901. Online Stock SpanVideo

Solution69.5%Medium

Data Stream, Design +2· 7 companies

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