Interview Prep/Companies/Oracle

Oracle

100 questions tracked100 with solutions

🔍

Frequency scoreSorted highest → lowest frequency✓ Our Solution = we have a detailed walkthrough

Showing 100 of 100 questions

MediumLRU Cache✓ Our Solution

100

Hash TableLinked ListDesignDoubly-Linked List

LeetCode ↗45% acc.

MediumNumber of Islands✓ Our Solution

ArrayDepth-First SearchBreadth-First SearchUnion Find+1

LeetCode ↗62% acc.

EasyTwo Sum✓ Our Solution

ArrayHash Table

LeetCode ↗56% acc.

MediumLongest Substring Without Repeating Characters✓ Our Solution

Hash TableStringSliding Window

LeetCode ↗37% acc.

MediumMerge Intervals✓ Our Solution

ArraySorting

LeetCode ↗49% acc.

MediumGroup Anagrams✓ Our Solution

ArrayHash TableStringSorting

LeetCode ↗71% acc.

MediumLongest Palindromic Substring✓ Our Solution

Two PointersStringDynamic Programming

LeetCode ↗36% acc.

HardMerge k Sorted Lists✓ Our Solution

Linked ListDivide and ConquerHeap (Priority Queue)Merge Sort

LeetCode ↗57% acc.

HardSliding Window Maximum✓ Our Solution

ArrayQueueSliding WindowHeap (Priority Queue)+1

LeetCode ↗48% acc.

MediumContainer With Most Water✓ Our Solution

ArrayTwo PointersGreedy

LeetCode ↗58% acc.

MediumSearch in Rotated Sorted Array✓ Our Solution

ArrayBinary Search

LeetCode ↗43% acc.

MediumBinary Tree Right Side View✓ Our Solution

TreeDepth-First SearchBreadth-First SearchBinary Tree

LeetCode ↗67% acc.

MediumLongest Consecutive Sequence✓ Our Solution

ArrayHash TableUnion Find

LeetCode ↗47% acc.

HardTrapping Rain Water✓ Our Solution

ArrayTwo PointersDynamic ProgrammingStack+1

LeetCode ↗65% acc.

MediumAdd Two Numbers✓ Our Solution

Linked ListMathRecursion

LeetCode ↗46% acc.

MediumSpiral Matrix✓ Our Solution

ArrayMatrixSimulation

LeetCode ↗54% acc.

EasyReverse Linked List✓ Our Solution

Linked ListRecursion

LeetCode ↗79% acc.

EasyMerge Two Sorted Lists✓ Our Solution

Linked ListRecursion

LeetCode ↗67% acc.

MediumJump Game✓ Our Solution

ArrayDynamic ProgrammingGreedy

LeetCode ↗39% acc.

EasyBest Time to Buy and Sell Stock✓ Our Solution

ArrayDynamic Programming

LeetCode ↗55% acc.

MediumPow(x, n)✓ Our Solution

MathRecursion

LeetCode ↗37% acc.

Medium3Sum✓ Our Solution

ArrayTwo PointersSorting

LeetCode ↗37% acc.

MediumCourse Schedule✓ Our Solution

Depth-First SearchBreadth-First SearchGraphTopological Sort

LeetCode ↗49% acc.

EasyRoman to Integer✓ Our Solution

Hash TableMathString

LeetCode ↗65% acc.

MediumBinary Tree Zigzag Level Order Traversal✓ Our Solution

TreeBreadth-First SearchBinary Tree

LeetCode ↗62% acc.

HardBinary Tree Maximum Path Sum✓ Our Solution

Dynamic ProgrammingTreeDepth-First SearchBinary Tree

LeetCode ↗41% acc.

MediumSearch a 2D Matrix II✓ Our Solution

ArrayBinary SearchDivide and ConquerMatrix

LeetCode ↗55% acc.

MediumCourse Schedule II✓ Our Solution

Depth-First SearchBreadth-First SearchGraphTopological Sort

LeetCode ↗53% acc.

MediumGas Station✓ Our Solution

ArrayGreedy

LeetCode ↗46% acc.

EasyLongest Common Prefix✓ Our Solution

StringTrie

LeetCode ↗45% acc.

MediumMaximum Subarray✓ Our Solution

ArrayDivide and ConquerDynamic Programming

LeetCode ↗52% acc.

MediumWord Search✓ Our Solution

ArrayStringBacktrackingDepth-First Search+1

LeetCode ↗45% acc.

HardFirst Missing Positive✓ Our Solution

ArrayHash Table

LeetCode ↗41% acc.

MediumKth Largest Element in an Array✓ Our Solution

ArrayDivide and ConquerSortingHeap (Priority Queue)+1

LeetCode ↗68% acc.

MediumSet Matrix Zeroes✓ Our Solution

ArrayHash TableMatrix

LeetCode ↗61% acc.

MediumLowest Common Ancestor of a Binary Tree✓ Our Solution

TreeDepth-First SearchBinary Tree

LeetCode ↗67% acc.

MediumMin Stack✓ Our Solution

StackDesign

LeetCode ↗56% acc.

MediumValidate Binary Search Tree✓ Our Solution

TreeDepth-First SearchBinary Search TreeBinary Tree

LeetCode ↗34% acc.

EasyLinked List Cycle✓ Our Solution

Hash TableLinked ListTwo Pointers

LeetCode ↗53% acc.

MediumRestore IP Addresses✓ Our Solution

StringBacktracking

LeetCode ↗53% acc.

MediumProduct of Array Except Self✓ Our Solution

ArrayPrefix Sum

LeetCode ↗68% acc.

MediumCombination Sum✓ Our Solution

ArrayBacktracking

LeetCode ↗75% acc.

EasyValid Anagram✓ Our Solution

Hash TableStringSorting

LeetCode ↗67% acc.

MediumSort Colors✓ Our Solution

ArrayTwo PointersSorting

LeetCode ↗68% acc.

HardMedian of Two Sorted Arrays✓ Our Solution

ArrayBinary SearchDivide and Conquer

LeetCode ↗44% acc.

MediumZigzag Conversion✓ Our Solution

String

LeetCode ↗52% acc.

MediumDelete Node in a Linked List✓ Our Solution

Linked List

LeetCode ↗82% acc.

MediumFind First and Last Position of Element in Sorted Array✓ Our Solution

ArrayBinary Search

LeetCode ↗47% acc.

MediumGenerate Parentheses✓ Our Solution

StringDynamic ProgrammingBacktracking

LeetCode ↗77% acc.

MediumMaximal Square✓ Our Solution

ArrayDynamic ProgrammingMatrix

LeetCode ↗49% acc.

MediumJump Game II✓ Our Solution

ArrayDynamic ProgrammingGreedy

LeetCode ↗42% acc.

MediumRotate Image✓ Our Solution

ArrayMathMatrix

LeetCode ↗78% acc.

EasyIsomorphic Strings✓ Our Solution

Hash TableString

LeetCode ↗47% acc.

EasyRemove Duplicates from Sorted Array✓ Our Solution

ArrayTwo Pointers

LeetCode ↗60% acc.

MediumCombination Sum II✓ Our Solution

ArrayBacktracking

LeetCode ↗58% acc.

MediumMinimum Size Subarray Sum✓ Our Solution

ArrayBinary SearchSliding WindowPrefix Sum

LeetCode ↗49% acc.

EasyMajority Element✓ Our Solution

ArrayHash TableDivide and ConquerSorting+1

LeetCode ↗66% acc.

MediumLetter Combinations of a Phone Number✓ Our Solution

Hash TableStringBacktracking

LeetCode ↗64% acc.

MediumKth Smallest Element in a BST✓ Our Solution

TreeDepth-First SearchBinary Search TreeBinary Tree

LeetCode ↗75% acc.

MediumInteger to Roman✓ Our Solution

Hash TableMathString

LeetCode ↗69% acc.

MediumPermutations✓ Our Solution

ArrayBacktracking

LeetCode ↗81% acc.

MediumCopy List with Random Pointer✓ Our Solution

Hash TableLinked List

LeetCode ↗61% acc.

HardWord Break II✓ Our Solution

ArrayHash TableStringDynamic Programming+3

LeetCode ↗54% acc.

MediumDecode Ways✓ Our Solution

StringDynamic Programming

LeetCode ↗37% acc.

HardLongest Valid Parentheses✓ Our Solution

StringDynamic ProgrammingStack

LeetCode ↗36% acc.

MediumRotate Array✓ Our Solution

ArrayMathTwo Pointers

LeetCode ↗43% acc.

MediumLargest Number✓ Our Solution

ArrayStringGreedySorting

LeetCode ↗41% acc.

HardRegular Expression Matching✓ Our Solution

StringDynamic ProgrammingRecursion

LeetCode ↗29% acc.

EasyInvert Binary Tree✓ Our Solution

TreeDepth-First SearchBreadth-First SearchBinary Tree

LeetCode ↗79% acc.

EasyPalindrome Number✓ Our Solution

Math

LeetCode ↗59% acc.

MediumFind Peak Element✓ Our Solution

ArrayBinary Search

LeetCode ↗47% acc.

MediumInsert Interval✓ Our Solution

Array

LeetCode ↗43% acc.

HardMax Points on a Line✓ Our Solution

ArrayHash TableMathGeometry

LeetCode ↗29% acc.

EasyMerge Sorted Array✓ Our Solution

ArrayTwo PointersSorting

LeetCode ↗53% acc.

HardSudoku Solver✓ Our Solution

ArrayHash TableBacktrackingMatrix

LeetCode ↗64% acc.

MediumUnique Paths✓ Our Solution

MathDynamic ProgrammingCombinatorics

LeetCode ↗66% acc.

MediumPopulating Next Right Pointers in Each Node✓ Our Solution

Linked ListTreeDepth-First SearchBreadth-First Search+1

LeetCode ↗65% acc.

MediumRotate List✓ Our Solution

Linked ListTwo Pointers

LeetCode ↗40% acc.

HardBasic Calculator✓ Our Solution

MathStringStackRecursion

LeetCode ↗46% acc.

HardText Justification✓ Our Solution

ArrayStringSimulation

LeetCode ↗48% acc.

HardMinimum Window Substring✓ Our Solution

Hash TableStringSliding Window

LeetCode ↗45% acc.

HardNumber of Unique Good Subsequences✓ Our Solution

StringDynamic Programming

LeetCode ↗52% acc.

EasyRemove Duplicates from Sorted List✓ Our Solution

Linked List

LeetCode ↗55% acc.

EasyPalindrome Linked List✓ Our Solution

Linked ListTwo PointersStackRecursion

LeetCode ↗56% acc.

EasyImplement Queue using Stacks✓ Our Solution

StackDesignQueue

LeetCode ↗68% acc.

EasyImplement Stack using Queues✓ Our Solution

StackDesignQueue

LeetCode ↗67% acc.

MediumTwo Sum II - Input Array Is Sorted✓ Our Solution

ArrayTwo PointersBinary Search

LeetCode ↗63% acc.

EasyExcel Sheet Column Title✓ Our Solution

MathString

LeetCode ↗44% acc.

MediumPath Sum II✓ Our Solution

BacktrackingTreeDepth-First SearchBinary Tree

LeetCode ↗60% acc.

MediumSort List✓ Our Solution

Linked ListTwo PointersDivide and ConquerSorting+1

LeetCode ↗62% acc.

EasyFind Subsequence of Length K With the Largest Sum✓ Our Solution

ArrayHash TableSortingHeap (Priority Queue)

LeetCode ↗46% acc.

EasyCount Number of Pairs With Absolute Difference K✓ Our Solution

ArrayHash TableCounting

LeetCode ↗85% acc.

EasyPascal's Triangle✓ Our Solution

ArrayDynamic Programming

LeetCode ↗77% acc.

MediumMaximum Product Subarray✓ Our Solution

ArrayDynamic Programming

LeetCode ↗35% acc.

MediumValid Sudoku✓ Our Solution

ArrayHash TableMatrix

LeetCode ↗62% acc.

MediumLowest Common Ancestor of a Binary Search Tree✓ Our Solution

TreeDepth-First SearchBinary Search TreeBinary Tree

LeetCode ↗68% acc.

HardMaximal Rectangle✓ Our Solution

ArrayDynamic ProgrammingStackMatrix+1

LeetCode ↗54% acc.

EasyDelete Duplicate Emails✓ Our Solution

Database

LeetCode ↗64% acc.

EasyIntersection of Two Linked Lists✓ Our Solution

Hash TableLinked ListTwo Pointers

LeetCode ↗61% acc.

100

EasyClimbing Stairs✓ Our Solution

MathDynamic ProgrammingMemoization

LeetCode ↗54% acc.