409.Longest Palindrome
EasyGreedyHash TableString55.9% acceptance8 companiesVideo
Easy · With video · 51 results
455.Assign Cookies
EasyArrayGreedySorting55.4% acceptance9 companiesVideo
561.Array Partition
EasyArrayCounting SortGreedy82.2% acceptance5 companiesVideo
605.Can Place Flowers
EasyArrayGreedy28.8% acceptance16 companiesVideo
680.Valid Palindrome II
EasyGreedyStringTwo Pointers44.7% acceptance16 companiesVideo
860.Lemonade Change
EasyArrayGreedy59.6% acceptance8 companiesVideo
942.DI String Match
EasyArrayGreedyString81.0% acceptance3 companiesVideo
976.Largest Perimeter Triangle
EasyArrayGreedyMath62.1% acceptance5 companiesVideo
1005.Maximize Sum Of Array After K Negations
EasyArrayGreedySorting54.3% acceptance4 companiesVideo
1013.Partition Array Into Three Parts With Equal Sum
EasyArrayGreedy43.2% acceptance5 companiesVideo
1196.How Many Apples Can You Put into the Basket
EasyArrayGreedySorting67.0% acceptance1 companyPremium elsewhere, free hereVideo
1217.Minimum Cost to Move Chips to The Same Position
EasyArrayGreedyMath72.8% acceptance5 companiesVideo
1221.Split a String in Balanced Strings
EasyCountingGreedyString87.3% acceptance4 companiesVideo
1323.Maximum 69 Number
EasyGreedyMath84.5% acceptance7 companiesVideo
1403.Minimum Subsequence in Non-Increasing Order
EasyArrayGreedySorting73.7% acceptance2 companiesVideo
1708.Largest Subarray Length K
EasyArrayGreedy65.7% acceptance1 companyPremium elsewhere, free hereVideo
1710.Maximum Units on a Truck
EasyArrayGreedySorting75.3% acceptance9 companiesVideo
1736.Latest Time by Replacing Hidden Digits
EasyGreedyString43.7% acceptance1 companyVideo
1827.Minimum Operations to Make the Array Increasing
EasyArrayGreedy82.5% acceptance4 companiesVideo
1903.Largest Odd Number in String
EasyGreedyMathString67.7% acceptance6 companiesVideo
1974.Minimum Time to Type Word Using Special Typewriter
EasyGreedyString79.1% acceptance3 companiesVideo
2027.Minimum Moves to Convert String
EasyGreedyString58.4% acceptance3 companiesVideo
2037.Minimum Number of Moves to Seat Everyone
EasyArrayCounting SortGreedy87.4% acceptance3 companiesVideo
2078.Two Furthest Houses With Different Colors
EasyArrayGreedy71.8% acceptance5 companiesVideo
2144.Minimum Cost of Buying Candies With Discount
EasyArrayGreedySorting71.5% acceptance5 companiesVideo
2160.Minimum Sum of Four Digit Number After Splitting Digits
EasyGreedyMathSorting86.2% acceptance2 companiesVideo
2224.Minimum Number of Operations to Convert Time
EasyGreedyString66.3% acceptance1 companyVideo
2259.Remove Digit From Number to Maximize Result
EasyEnumerationGreedyString48.4% acceptance6 companiesVideo
2335.Minimum Amount of Time to Fill Cups
EasyArrayGreedyHeap (Priority Queue)60.7% acceptance1 companyVideo
2357.Make Array Zero by Subtracting Equal Amounts
EasyArrayGreedyHash Table73.8% acceptance1 companyVideo
2383.Minimum Hours of Training to Win a Competition
EasyArrayGreedy42.5% acceptance1 companyVideo
2389.Longest Subsequence With Limited Sum
EasyArrayBinary SearchGreedy73.5% acceptance4 companiesVideo
2566.Maximum Difference by Remapping a Digit
EasyGreedyMath75.5% acceptance3 companiesVideo
2578.Split With Minimum Sum
EasyGreedyMathSorting74.0% acceptance2 companiesVideo
2591.Distribute Money to Maximum Children
EasyGreedyMath20.5% acceptance4 companiesVideo
2600.K Items With the Maximum Sum
EasyGreedyMath60.2% acceptance2 companiesVideo
2656.Maximum Sum With Exactly K Elements
EasyArrayGreedy79.9% acceptance1 companyVideo
2697.Lexicographically Smallest Palindrome
EasyGreedyStringTwo Pointers81.1% acceptance3 companiesVideo
2706.Buy Two Chocolates
EasyArrayGreedySorting68.3% acceptance2 companiesVideo
2864.Maximum Odd Binary Number
EasyGreedyMathString83.0% acceptance3 companiesVideo
2900.Longest Unequal Adjacent Groups Subsequence I
EasyArrayDynamic ProgrammingGreedy67.0% acceptance1 companyVideo
3014.Minimum Number of Pushes to Type Word I
EasyGreedyMathString77.1% acceptance4 companiesVideo
3074.Apple Redistribution into Boxes
EasyArrayGreedySorting78.5% acceptance3 companiesVideo
3216.Lexicographically Smallest String After a Swap
EasyGreedyString54.6% acceptance1 companyVideo
3402.Minimum Operations to Make Columns Strictly Increasing
EasyArrayGreedyMatrix71.9% acceptance1 companyVideo
3487.Maximum Unique Subarray Sum After Deletion
EasyArrayGreedyHash Table40.5% acceptance5 companiesVideo
3545.Minimum Deletions for At Most K Distinct Characters
EasyCountingGreedyHash Table72.2% acceptance2 companiesVideo
3633.Earliest Finish Time for Land and Water Rides I
EasyArrayBinary SearchGreedy73.0% acceptance4 companiesVideo
3684.Maximize Sum of At Most K Distinct Elements
EasyArrayGreedyHash Table76.8% acceptanceVideo
3745.Maximize Expression of Three Elements
EasyArrayEnumerationGreedy72.3% acceptanceVideo
Showing 1–50 of 51
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.