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Interviews

Your personal guide to Software Development technical interviews.

Maintainer - Kevin Naughton Jr.

Table of Contents

Online Judges

Live Coding Practice

Data Structures

Linked List

  • A Linked List is a linear collection of data elements, called nodes, each pointing to the next node by means of a pointer. It is a data structure consisting of a group of nodes which together represent a sequence.
  • Singly-linked list: linked list in which nodes have pointers to the next node
  • Doubly-linked list: linked list in which nodes have pointers to both the previous node and the next node
  • Time Complexity:
    • Access: O(n)
    • Search: O(n)
    • Insert: O(1)
    • Remove: O(1)

Stack

  • A Stack is a collection of elements, with two principle operations: push, which adds to the collection, and pop, which removes the most recently added element
  • Last in, first out data structure (LIFO)

Queue

  • A Queue is a collection of elements, supporting two principle operations: enqueue, which inserts an element into the queue, and dequeue, which removes an element from the queue
  • First in, first out data structure (FIFO)

Tree

  • A Tree is an undirected, connected, acyclic graph

Binary Tree

  • A Binary Tree is a tree data structure in which each node has at most two children, which are referred to as the left child and right child
  • Full Tree: a tree in which every node has either 0 or 2 children
  • Perfect Binary Tree: a binary tree in which all interior nodes have two children and all leave have the same depth
  • Complete Tree: a binary tree in which every level except possibly the last is full and all nodes in the last level are as far left as possible
  • Binary Search Tree
  • A binary search tree, sometimes called BST, is a type of binary tree which maintains the property that the value in each node must be greater than or equal to any value stored in the left sub-tree, and less than or equal to any value stored in the right sub-tree
  • Time Complexity:
  • Access: O(log(n))
  • Search: O(log(n))
  • Insert: O(log(n))
  • Remove: O(log(n))

Heap

Hashing

Graph

Algorithms

Sorting

Quicksort

  • Quicksort is a divide and conquer algorithm. It picks an element as a pivot and partitions the given array around the selected pivot. This process is repeated recursively for the left subarray and right subarray
  • Stable: No
  • Time Complexity:
  • Best Case: O(nlog(n))
  • Worst Case: O(n^2)
  • Average Case: O(nlog(n))

Mergesort

  • Mergesort is also a divide and conquer algorithm. It continuously divides an array into two halves, recurses on both the left subarray and right subarray and then merges the two sorted halves
  • Stable: Yes
  • Time Complexity:
  • Best Case: O(nlog(n))
  • Worst Case: O(nlog(n))
  • Average Case: O(nlog(n))

Computer Science News

Directory Tree

.
├── Array
│   ├── bestTimeToBuyAndSellStock.java
│   ├── findTheCelebrity.java
│   ├── gameOfLife.java
│   ├── increasingTripletSubsequence.java
│   ├── insertInterval.java
│   ├── longestConsecutiveSequence.java
│   ├── maximumProductSubarray.java
│   ├── maximumSubarray.java
│   ├── mergeIntervals.java
│   ├── missingRanges.java
│   ├── productOfArrayExceptSelf.java
│   ├── rotateImage.java
│   ├── searchInRotatedSortedArray.java
│   ├── spiralMatrixII.java
│   ├── subsetsII.java
│   ├── subsets.java
│   ├── summaryRanges.java
│   ├── wiggleSort.java
│   └── wordSearch.java
├── Backtracking
│   ├── androidUnlockPatterns.java
│   ├── generalizedAbbreviation.java
│   └── letterCombinationsOfAPhoneNumber.java
├── BinarySearch
│   ├── closestBinarySearchTreeValue.java
│   ├── firstBadVersion.java
│   ├── guessNumberHigherOrLower.java
│   ├── pow(x,n).java
│   └── sqrt(x).java
├── BitManipulation
│   ├── binaryWatch.java
│   ├── countingBits.java
│   ├── hammingDistance.java
│   ├── maximumProductOfWordLengths.java
│   ├── numberOf1Bits.java
│   ├── sumOfTwoIntegers.java
│   └── utf-8Validation.java
├── BreadthFirstSearch
│   ├── binaryTreeLevelOrderTraversal.java
│   ├── cloneGraph.java
│   ├── pacificAtlanticWaterFlow.java
│   ├── removeInvalidParentheses.java
│   ├── shortestDistanceFromAllBuildings.java
│   ├── symmetricTree.java
│   └── wallsAndGates.java
├── DepthFirstSearch
│   ├── balancedBinaryTree.java
│   ├── battleshipsInABoard.java
│   ├── convertSortedArrayToBinarySearchTree.java
│   ├── maximumDepthOfABinaryTree.java
│   ├── numberOfIslands.java
│   ├── populatingNextRightPointersInEachNode.java
│   └── sameTree.java
├── Design
│   └── zigzagIterator.java
├── DivideAndConquer
│   ├── expressionAddOperators.java
│   └── kthLargestElementInAnArray.java
├── DynamicProgramming
│   ├── bombEnemy.java
│   ├── climbingStairs.java
│   ├── combinationSumIV.java
│   ├── countingBits.java
│   ├── editDistance.java
│   ├── houseRobber.java
│   ├── paintFence.java
│   ├── paintHouseII.java
│   ├── regularExpressionMatching.java
│   ├── sentenceScreenFitting.java
│   ├── uniqueBinarySearchTrees.java
│   └── wordBreak.java
├── HashTable
│   ├── binaryTreeVerticalOrderTraversal.java
│   ├── findTheDifference.java
│   ├── groupAnagrams.java
│   ├── groupShiftedStrings.java
│   ├── islandPerimeter.java
│   ├── loggerRateLimiter.java
│   ├── maximumSizeSubarraySumEqualsK.java
│   ├── minimumWindowSubstring.java
│   ├── sparseMatrixMultiplication.java
│   ├── strobogrammaticNumber.java
│   ├── twoSum.java
│   └── uniqueWordAbbreviation.java
├── LinkedList
│   ├── addTwoNumbers.java
│   ├── deleteNodeInALinkedList.java
│   ├── mergeKSortedLists.java
│   ├── palindromeLinkedList.java
│   ├── plusOneLinkedList.java
│   ├── README.md
│   └── reverseLinkedList.java
├── Queue
│   └── movingAverageFromDataStream.java
├── README.md
├── Sort
│   ├── meetingRoomsII.java
│   └── meetingRooms.java
├── Stack
│   ├── binarySearchTreeIterator.java
│   ├── decodeString.java
│   ├── flattenNestedListIterator.java
│   └── trappingRainWater.java
├── String
│   ├── addBinary.java
│   ├── countAndSay.java
│   ├── decodeWays.java
│   ├── editDistance.java
│   ├── integerToEnglishWords.java
│   ├── longestPalindrome.java
│   ├── longestSubstringWithAtMostKDistinctCharacters.java
│   ├── minimumWindowSubstring.java
│   ├── multiplyString.java
│   ├── oneEditDistance.java
│   ├── palindromePermutation.java
│   ├── README.md
│   ├── reverseVowelsOfAString.java
│   ├── romanToInteger.java
│   ├── validPalindrome.java
│   └── validParentheses.java
├── Tree
│   ├── binaryTreeMaximumPathSum.java
│   ├── binaryTreePaths.java
│   ├── inorderSuccessorInBST.java
│   ├── invertBinaryTree.java
│   ├── lowestCommonAncestorOfABinaryTree.java
│   ├── sumOfLeftLeaves.java
│   └── validateBinarySearchTree.java
├── Trie
│   ├── addAndSearchWordDataStructureDesign.java
│   ├── implementTrie.java
│   └── wordSquares.java
└── TwoPointers
    ├── 3Sum.java
    ├── 3SumSmaller.java
    ├── mergeSortedArray.java
    ├── minimumSizeSubarraySum.java
    ├── moveZeros.java
    ├── removeDuplicatesFromSortedArray.java
    ├── reverseString.java
    └── sortColors.java

18 directories, 124 files