- Find the Smallest Number
Given an array, find the smallest number in the array. - Find Missing Numbers
In an array, 1-100 numbers are stored. One number is missing. How do you find it? - Find Duplicate Numbers
In an array of 1-100, exactly one number is duplicate. How do you find it? - Compare Arrays
Given two arrays, find which number(s) is not present in the second array. - Longest Consecutive Sequence
Given an unsorted array of integers, find the length of the longest consecutive elements sequence. - Two Sum
Given an array of integers, return indices of the two numbers such that they add up to a specific target. - Remove Duplicates from Sorted Array
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. - Pascal Triangle
Given an integerx
, generate the firstx
number of rows of Pascal’s triangle. - Powerset
Given an array or set of objects, return a set of all possible subsets.
- Remove Character
Remove all instances of a specific character from the given String. - String Palindrome Check
Given a String, check if the String is a valid palindrome. - Multiply String
Given two numbers represented as strings, return multiplication of the numbers as a string. Do not use BigInteger. - Merge and Order String Characters
Given an array of strings, return a single string containing all the characters in alphabetical order.
- Array Implementation
Includes the following methods: push(), pop(), peek(), size(), isEmpty() and isFull(). - Balanced Parentheses
Given a String, determine if the parentheses have pairs and are in order.
- Reverse Linked List
Reverse a singly linked list.
- Binary Tree
Includes methods for inserting, removing, traversing (in order, pre-order, post-order)
and searching (find by value, smallest, nth smallest element).
- Quick Sort - average O(n log n); worst O(n^2)
- Merge Sort - guaranteed O(n log n)
- Insertion Sort - O(n^2)
- Bubble Sort - O(n^2)
- Selection Sort - O(n^2)
- Binary Search - O(log n)
- Linear Search - O(n)
- Is Prime
Given an integer, determine whether the integer is a prime number. - Fibonacci Sequence
Given an integerx
, printx
number of elements in the sequence.
Given an integer, return the value of the element in that position of the sequence. - Integer Palindrome Check
Given an integer, determine whether the integer is a valid palindrome. - Prime Sum
Given an even number (greater than 2), return two prime numbers whose sum will be equal to given number. - Find Factors
Return a list of all factors of a given integer.