Solutions & Explanations

Browse 4,029+ detailed solutions with multiple approaches, code in Python, Java, C++ and more.

4,029 Solutions961 Easy2102 Medium966 Hard

Title	Difficulty	Acceptance	Topics	Solution
1262. Greatest Sum Divisible by Three	Medium	57.1%	Array Dynamic Programming+2	Read
1264. Page Recommendations	Medium	65.3%	Database	Read
1265. Print Immutable Linked List in Reverse	Medium	94.0%	Linked List Recursion+2	Read
1267. Count Servers that Communicate	Medium	73.5%	Array Breadth-First Search+4	Read
1268. Search Suggestions System	Medium	65.1%	Array Binary Search+4	Read
1270. All People Report to the Given Manager	Medium	84.5%	Database	Read
1272. Remove Interval	Medium	67.2%	Array	Read
1273. Delete Tree Nodes	Medium	61.2%	Array Breadth-First Search+2	Read
1276. Number of Burgers with No Waste of Ingredients	Medium	52.7%	Math	Read
1277. Count Square Submatrices with All Ones	Medium	80.7%	Array Dynamic Programming+1	Read
1282. Group the People Given the Group Size They Belong To	Medium	87.4%	Array Greedy+1	Read
1283. Find the Smallest Divisor Given a Threshold	Medium	66.8%	Array Binary Search	Read
1285. Find the Start and End Number of Continuous Ranges	Medium	82.1%	Database	Read
1286. Iterator for Combination	Medium	72.7%	Backtracking Design+2	Read
1288. Remove Covered Intervals	Medium	60.1%	Array Sorting	Read
1291. Sequential Digits	Medium	68.6%	Enumeration	Read
1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Medium	65.4%	Array Binary Search+2	Read
1296. Divide Array in Sets of K Consecutive Numbers	Medium	59.2%	Array Greedy+2	Read
1297. Maximum Number of Occurrences of a Substring	Medium	54.9%	Hash Table Sliding Window+1	Read
1300. Sum of Mutated Array Closest to Target	Medium	46.2%	Array Binary Search+1	Read
1302. Deepest Leaves Sum	Medium	86.3%	Binary Tree Breadth-First Search+2	Read
1305. All Elements in Two Binary Search Trees	Medium	79.9%	Binary Search Tree Binary Tree+3	Read
1306. Jump Game III	Medium	70.1%	Array Breadth-First Search+1	Read
1308. Running Total for Different Genders	Medium	86.3%	Database	Read
1310. XOR Queries of a Subarray	Medium	78.1%	Array Bit Manipulation+1	Read
1311. Get Watched Videos by Your Friends	Medium	54.2%	Array Breadth-First Search+3	Read
1314. Matrix Block Sum	Medium	77.0%	Array Matrix+1	Read
1315. Sum of Nodes with Even-Valued Grandparent	Medium	85.6%	Binary Tree Breadth-First Search+2	Read
1318. Minimum Flips to Make a OR b Equal to c	Medium	71.9%	Bit Manipulation	Read
1319. Number of Operations to Make Network Connected	Medium	67.0%	Breadth-First Search Depth-First Search+2	Read
1321. Restaurant Growth	Medium	54.4%	Database	Read
1324. Print Words Vertically	Medium	68.1%	Array Simulation+1	Read
1325. Delete Leaves With a Given Value	Medium	77.4%	Binary Tree Depth-First Search+1	Read
1328. Break a Palindrome	Medium	51.6%	Greedy String	Read
1329. Sort the Matrix Diagonally	Medium	82.9%	Array Matrix+1	Read
1333. Filter Restaurants by Vegan-Friendly, Price and Distance	Medium	64.2%	Array Sorting	Read
1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium	73.5%	Dynamic Programming Graph+1	Read
1338. Reduce Array Size to The Half	Medium	69.5%	Array Greedy+3	Read
1339. Maximum Product of Splitted Binary Tree	Medium	55.7%	Binary Tree Depth-First Search+1	Read
1341. Movie Rating	Medium	40.8%	Database	Read
1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Medium	74.3%	Array Sliding Window	Read
1344. Angle Between Hands of a Clock	Medium	69.6%	Math	Read
1347. Minimum Number of Steps to Make Two Strings Anagram	Medium	82.6%	Counting Hash Table+1	Read
1348. Tweet Counts Per Frequency	Medium	46.6%	Binary Search Design+3	Read
1352. Product of the Last K Numbers	Medium	62.9%	Array Data Stream+3	Read
1353. Maximum Number of Events That Can Be Attended	Medium	38.9%	Array Greedy+2	Read
1355. Activity Participants	Medium	72.3%	Database	Read
1357. Apply Discount Every n Orders	Medium	66.1%	Array Design+1	Read
1358. Number of Substrings Containing All Three Characters	Medium	74.4%	Hash Table Sliding Window+1	Read
1361. Validate Binary Tree Nodes	Medium	43.8%	Binary Tree Breadth-First Search+4	Read

#1262Medium

Greatest Sum Divisible by Three

ArrayDynamic ProgrammingGreedy+1

Acceptance: 57.1%

#1264Medium

Page Recommendations

Database

Acceptance: 65.3%

#1265Medium

Print Immutable Linked List in Reverse

Linked ListRecursionStack+1

Acceptance: 94.0%

#1267Medium

Count Servers that Communicate

ArrayBreadth-First SearchCounting+3

Acceptance: 73.5%

#1268Medium

Search Suggestions System

ArrayBinary SearchHeap (Priority Queue)+3

Acceptance: 65.1%

#1270Medium

All People Report to the Given Manager

Database

Acceptance: 84.5%

#1272Medium

Remove Interval

Array

Acceptance: 67.2%

#1273Medium

Delete Tree Nodes

ArrayBreadth-First SearchDepth-First Search+1

Acceptance: 61.2%

#1276Medium

Number of Burgers with No Waste of Ingredients

Math

Acceptance: 52.7%

#1277Medium

Count Square Submatrices with All Ones

ArrayDynamic ProgrammingMatrix

Acceptance: 80.7%

#1282Medium

Group the People Given the Group Size They Belong To

ArrayGreedyHash Table

Acceptance: 87.4%

#1283Medium

Find the Smallest Divisor Given a Threshold

ArrayBinary Search

Acceptance: 66.8%

#1285Medium

Find the Start and End Number of Continuous Ranges

Database

Acceptance: 82.1%

#1286Medium

Iterator for Combination

BacktrackingDesignIterator+1

Acceptance: 72.7%

#1288Medium

Remove Covered Intervals

ArraySorting

Acceptance: 60.1%

#1291Medium

Sequential Digits

Enumeration

Acceptance: 68.6%

#1292Medium

Maximum Side Length of a Square with Sum Less than or Equal to Threshold

ArrayBinary SearchMatrix+1

Acceptance: 65.4%

#1296Medium

Divide Array in Sets of K Consecutive Numbers

ArrayGreedyHash Table+1

Acceptance: 59.2%

#1297Medium

Maximum Number of Occurrences of a Substring

Hash TableSliding WindowString

Acceptance: 54.9%

#1300Medium

Sum of Mutated Array Closest to Target

ArrayBinary SearchSorting

Acceptance: 46.2%

#1302Medium

Deepest Leaves Sum

Binary TreeBreadth-First SearchDepth-First Search+1

Acceptance: 86.3%

#1305Medium

All Elements in Two Binary Search Trees

Binary Search TreeBinary TreeDepth-First Search+2

Acceptance: 79.9%

#1306Medium

Jump Game III

ArrayBreadth-First SearchDepth-First Search

Acceptance: 70.1%

#1308Medium

Running Total for Different Genders

Database

Acceptance: 86.3%

#1310Medium

XOR Queries of a Subarray

ArrayBit ManipulationPrefix Sum

Acceptance: 78.1%

#1311Medium

Get Watched Videos by Your Friends

ArrayBreadth-First SearchGraph+2

Acceptance: 54.2%

#1314Medium

Matrix Block Sum

ArrayMatrixPrefix Sum

Acceptance: 77.0%

#1315Medium

Sum of Nodes with Even-Valued Grandparent

Binary TreeBreadth-First SearchDepth-First Search+1

Acceptance: 85.6%

#1318Medium

Minimum Flips to Make a OR b Equal to c

Bit Manipulation

Acceptance: 71.9%

#1319Medium

Number of Operations to Make Network Connected

Breadth-First SearchDepth-First SearchGraph+1

Acceptance: 67.0%

#1321Medium

Restaurant Growth

Database

Acceptance: 54.4%

#1324Medium

Print Words Vertically

ArraySimulationString

Acceptance: 68.1%

#1325Medium

Delete Leaves With a Given Value

Binary TreeDepth-First SearchTree

Acceptance: 77.4%

#1328Medium

Break a Palindrome

GreedyString

Acceptance: 51.6%

#1329Medium

Sort the Matrix Diagonally

ArrayMatrixSorting

Acceptance: 82.9%

#1333Medium

Filter Restaurants by Vegan-Friendly, Price and Distance

ArraySorting

Acceptance: 64.2%

#1334Medium

Find the City With the Smallest Number of Neighbors at a Threshold Distance

Dynamic ProgrammingGraphShortest Path

Acceptance: 73.5%

#1338Medium

Reduce Array Size to The Half

ArrayGreedyHash Table+2

Acceptance: 69.5%

#1339Medium

Maximum Product of Splitted Binary Tree

Binary TreeDepth-First SearchTree

Acceptance: 55.7%

#1341Medium

Movie Rating

Database

Acceptance: 40.8%

#1343Medium

Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold

ArraySliding Window

Acceptance: 74.3%

#1344Medium

Angle Between Hands of a Clock

Math

Acceptance: 69.6%

#1347Medium

Minimum Number of Steps to Make Two Strings Anagram

CountingHash TableString

Acceptance: 82.6%

#1348Medium

Tweet Counts Per Frequency

Binary SearchDesignHash Table+2

Acceptance: 46.6%

#1352Medium

Product of the Last K Numbers

ArrayData StreamDesign+2

Acceptance: 62.9%

#1353Medium

Maximum Number of Events That Can Be Attended

ArrayGreedyHeap (Priority Queue)+1

Acceptance: 38.9%

#1355Medium

Activity Participants

Database

Acceptance: 72.3%

#1357Medium

Apply Discount Every n Orders

ArrayDesignHash Table

Acceptance: 66.1%

#1358Medium

Number of Substrings Containing All Three Characters

Hash TableSliding WindowString

Acceptance: 74.4%

#1361Medium

Validate Binary Tree Nodes

Binary TreeBreadth-First SearchDepth-First Search+3

Acceptance: 43.8%

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Master DSA with Step-by-Step Solutions

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How to Use These Solutions

Try the problem first: Spend at least 20 minutes before reading the solution
Read all approaches: Start from brute force to understand the problem fully, then study the optimized solution
Understand the complexity: Pay attention to time and space analysis for each approach
Code it yourself: After understanding the approach, close the solution and implement from memory
Revisit after a week: Spaced repetition helps retain problem-solving patterns