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31 questions tracked31 with solutions
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Frequency scoreSorted highest β†’ lowest frequencyβœ“ Our Solution = we have a detailed walkthrough

Showing 31 of 31 questions

1
MediumNumber of Subarrays That Match a Pattern Iβœ“ Our Solution
100
ArrayRolling HashString MatchingHash Function
2
EasyNumber of Changing Keysβœ“ Our Solution
98
String
3
EasyDistribute Elements Into Two Arrays Iβœ“ Our Solution
96
ArraySimulation
4
HardDistribute Elements Into Two Arrays IIβœ“ Our Solution
96
ArrayBinary Indexed TreeSegment TreeSimulation
5
HardNumber of Subarrays That Match a Pattern IIβœ“ Our Solution
96
ArrayRolling HashString MatchingHash Function
6
HardCount Prefix and Suffix Pairs IIβœ“ Our Solution
96
ArrayStringTrieRolling Hash+2
7
EasyCount Prefix and Suffix Pairs Iβœ“ Our Solution
96
ArrayStringTrieRolling Hash+2
8
MediumGroup Anagramsβœ“ Our Solution
73
ArrayHash TableStringSorting
9
HardSliding Window Maximumβœ“ Our Solution
73
ArrayQueueSliding WindowHeap (Priority Queue)+1
10
MediumSearch in Rotated Sorted Arrayβœ“ Our Solution
66
ArrayBinary Search
11
MediumMaximum Subarrayβœ“ Our Solution
66
ArrayDivide and ConquerDynamic Programming
12
EasyValid Parenthesesβœ“ Our Solution
66
StringStack
13
MediumCombination Sumβœ“ Our Solution
66
ArrayBacktracking
14
HardReverse Nodes in k-Groupβœ“ Our Solution
56
Linked ListRecursion
15
HardMedian of Two Sorted Arraysβœ“ Our Solution
56
ArrayBinary SearchDivide and Conquer
16
MediumLongest Increasing Subsequenceβœ“ Our Solution
56
ArrayBinary SearchDynamic Programming
17
EasyLinked List Cycleβœ“ Our Solution
56
Hash TableLinked ListTwo Pointers
18
MediumSort Colorsβœ“ Our Solution
56
ArrayTwo PointersSorting
19
MediumLetter Combinations of a Phone Numberβœ“ Our Solution
56
Hash TableStringBacktracking
20
MediumLongest Palindromic Substringβœ“ Our Solution
56
Two PointersStringDynamic Programming
21
56
ArrayTwo PointersSorting
22
MediumElimination Gameβœ“ Our Solution
56
MathRecursion
23
MediumSet Matrix Zeroesβœ“ Our Solution
56
ArrayHash TableMatrix
24
MediumValid Sudokuβœ“ Our Solution
56
ArrayHash TableMatrix
25
MediumMinimum Size Subarray Sumβœ“ Our Solution
56
ArrayBinary SearchSliding WindowPrefix Sum
26
MediumKoko Eating Bananasβœ“ Our Solution
56
ArrayBinary Search
27
EasyMajority Elementβœ“ Our Solution
56
ArrayHash TableDivide and ConquerSorting+1
28
MediumRestore IP Addressesβœ“ Our Solution
56
StringBacktracking
29
HardBlock Placement Queriesβœ“ Our Solution
56
ArrayBinary SearchBinary Indexed TreeSegment Tree
30
MediumProduct of Array Except Selfβœ“ Our Solution
56
ArrayPrefix Sum
31
MediumLRU Cacheβœ“ Our Solution
56
Hash TableLinked ListDesignDoubly-Linked List