1468.Calculate Salaries
MediumDatabase77.2% acceptancePremium elsewhere, free hereVideo
Medium · With video · 2,042 results
1471.The k Strongest Values in an Array
MediumArraySortingTwo Pointers62.6% acceptance1 companyVideo
1472.Design Browser History
MediumArrayData StreamDesign78.3% acceptance13 companiesVideo
1476.Subrectangle Queries
MediumArrayDesignMatrix86.3% acceptance3 companiesVideo
1477.Find Two Non-overlapping Sub-arrays Each With Target Sum
MediumArrayBinary SearchDynamic Programming49.5% acceptance1 companyVideo
1481.Least Number of Unique Integers after K Removals
MediumArrayCountingGreedy63.8% acceptance7 companiesVideo
1482.Minimum Number of Days to Make m Bouquets
MediumArrayBinary Search56.9% acceptance9 companiesVideo
1485.Clone Binary Tree With Random Pointer
MediumBinary TreeBreadth-First SearchDepth-First Search81.2% acceptance2 companiesPremium elsewhere, free hereVideo
1487.Making File Names Unique
MediumArrayHash TableString38.5% acceptance1 companyVideo
1488.Avoid Flood in The City
MediumArrayBinary SearchGreedy39.0% acceptance6 companiesVideo
1490.Clone N-ary Tree
MediumBreadth-First SearchDepth-First SearchHash Table83.2% acceptance1 companyPremium elsewhere, free hereVideo
1492.The kth Factor of n
MediumMathNumber Theory70.8% acceptance7 companiesVideo
1493.Longest Subarray of 1's After Deleting One Element
MediumArrayDynamic ProgrammingSliding Window71.7% acceptance8 companiesVideo
1497.Check If Array Pairs Are Divisible by k
MediumArrayCountingHash Table46.2% acceptance8 companiesVideo
1498.Number of Subsequences That Satisfy the Given Sum Condition
MediumArrayBinary SearchSorting49.2% acceptance6 companiesVideo
1500.Design a File Sharing System
MediumData StreamDesignHash Table41.7% acceptance1 companyPremium elsewhere, free hereVideo
1501.Countries You Can Safely Invest In
MediumDatabase50.9% acceptancePremium elsewhere, free hereVideo
1503.Last Moment Before All Ants Fall Out of a Plank
MediumArrayBrainteaserSimulation68.3% acceptance1 companyVideo
1504.Count Submatrices With All Ones
MediumArrayDynamic ProgrammingMatrix71.0% acceptance4 companiesVideo
1506.Find Root of N-Ary Tree
MediumBit ManipulationDepth-First SearchHash Table78.4% acceptance3 companiesPremium elsewhere, free hereVideo
1508.Range Sum of Sorted Subarray Sums
MediumArrayBinary SearchSorting63.2% acceptance3 companiesVideo
1509.Minimum Difference Between Largest and Smallest Value in Three Moves
MediumArrayGreedySorting59.2% acceptance2 companiesVideo
1513.Number of Substrings With Only 1s
MediumMathString57.4% acceptance3 companiesVideo
1514.Path with Maximum Probability
MediumArrayGraphHeap (Priority Queue)65.9% acceptance5 companiesVideo
1519.Number of Nodes in the Sub-Tree With the Same Label
MediumBreadth-First SearchCountingDepth-First Search55.5% acceptance2 companiesVideo
1522.Diameter of N-Ary Tree
MediumDepth-First SearchTree75.4% acceptance3 companiesPremium elsewhere, free hereVideo
1524.Number of Sub-arrays With Odd Sum
MediumArrayDynamic ProgrammingMath55.7% acceptance6 companiesVideo
1525.Number of Good Ways to Split a String
MediumBit ManipulationDynamic ProgrammingHash Table68.2% acceptance2 companiesVideo
1529.Minimum Suffix Flips
MediumGreedyString73.9% acceptance5 companiesVideo
1530.Number of Good Leaf Nodes Pairs
MediumBinary TreeDepth-First SearchTree71.9% acceptance3 companiesVideo
1532.The Most Recent Three Orders
MediumDatabase69.3% acceptancePremium elsewhere, free hereVideo
1533.Find the Index of the Large Integer
MediumArrayBinary SearchInteractive56.7% acceptance1 companyPremium elsewhere, free hereVideo
1535.Find the Winner of an Array Game
MediumArraySimulation56.8% acceptance4 companiesVideo
1536.Minimum Swaps to Arrange a Binary Grid
MediumArrayGreedyMatrix70.1% acceptance2 companiesVideo
1538.Guess the Majority in a Hidden Array
MediumArrayInteractiveMath68.8% acceptance1 companyPremium elsewhere, free hereVideo
1540.Can Convert String in K Moves
MediumHash TableString38.2% acceptance1 companyVideo
1541.Minimum Insertions to Balance a Parentheses String
MediumGreedyStackString61.8% acceptance3 companiesVideo
1545.Find Kth Bit in Nth Binary String
MediumRecursionSimulationString73.7% acceptance5 companiesVideo
1546.Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
MediumArrayGreedyHash Table49.4% acceptance1 companyVideo
1549.The Most Recent Orders for Each Product
MediumDatabase64.9% acceptance1 companyPremium elsewhere, free hereVideo
1551.Minimum Operations to Make Array Equal
MediumMath82.8% acceptance2 companiesVideo
1552.Magnetic Force Between Two Balls
MediumArrayBinary SearchSorting72.6% acceptance9 companiesVideo
1554.Strings Differ by One Character
MediumHash FunctionHash TableRolling Hash39.4% acceptance1 companyPremium elsewhere, free hereVideo
1555.Bank Account Summary
MediumDatabase52.4% acceptance1 companyPremium elsewhere, free hereVideo
1557.Minimum Number of Vertices to Reach All Nodes
MediumGraph81.6% acceptance4 companiesVideo
1558.Minimum Numbers of Function Calls to Make Target Array
MediumArrayBit ManipulationGreedy62.9% acceptance1 companyVideo
1559.Detect Cycles in 2D Grid
MediumArrayBreadth-First SearchDepth-First Search63.2% acceptance6 companiesVideo
1561.Maximum Number of Coins You Can Get
MediumArrayGame TheoryGreedy84.9% acceptance1 companyVideo
1562.Find Latest Group of Size M
MediumArrayBinary SearchHash Table43.8% acceptance1 companyVideo
1564.Put Boxes Into the Warehouse I
MediumArrayGreedySorting67.9% acceptance3 companiesPremium elsewhere, free hereVideo
Showing 801–850 of 2,042
How to use these solutions
Each solution breaks the problem into approaches, usually from brute force to the best one, and explains why each works. Code comes in Python, Java, C++ and other languages. Knowing why an approach works matters more in an interview than remembering the code.
- Try the problem first. Give it at least 20 minutes before you open the solution.
- Read every approach. The brute force shows you the problem; the faster ones show the pattern.
- Check the complexity. Note the time and space of each approach and what makes the difference.
- Write it yourself. Close the solution and code it from memory in the editor.
- Come back in a week. Solving it again later is what makes the pattern stick.