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### 50+ Data Structure, Algorithms & Programming Languages Interview Questions for Programmers

**what kind of programming interview questions to expect**when you're applying for a job with these companies.

**from people who have just graduated from college to programmers with one to two years of experience.**

- How do you find the missing number in a given integer array of 1 to 100? (solution)
- How do you find the duplicate number on a given integer array? (solution)
- How do you find the largest and smallest number in an unsorted integer array? (solution)
- How do you find all pairs of an integer array whose sum is equal to a given number? (solution)
- How do you find duplicate numbers in an array if it contains multiple duplicates? (solution)
- How are duplicates removed from a given array in Java? (solution)
- How is an integer array sorted in place using the quicksort algorithm? (solution)
- How do you remove duplicates from an array in place? (solution)
- How do you reverse an array in place in Java? (solution)
- How are duplicates removed from an array without using any library? (solution)

- How do you find the middle element of a singly linked list in one pass? (solution)
- How do you check if a given linked list contains a cycle? How do you find the starting node of the cycle? (solution)
- How do you reverse a linked list? (solution)
- How do you reverse a singly linked list without recursion? (solution)
- How are duplicate nodes removed in an unsorted linked list? (solution)
- How do you find the length of a singly linked list? (solution)
- How do you find the third node from the end in a singly linked list? (solution)
- How do you find the sum of two linked lists using Stack? (solution)

- How do you print duplicate characters from a string? (solution)
- How do you check if two strings are anagrams of each other? (solution)
- How do you print the first non-repeated character from a string? (solution)
- How can a given string be reversed using recursion? (solution)
- How do you check if a string contains only digits? (solution)
- How are duplicate characters found in a string? (solution)
- How do you count a number of vowels and consonants in a given string? (solution)
- How do you count the occurrence of a given character in a string? (solution)
- How do you find all permutations of a string? (solution)
- How do you reverse words in a given sentence without using any library method? (solution)
- How do you check if two strings are a rotation of each other? (solution)
- How do you check if a given string is a palindrome? (solution)

- How is a binary search tree implemented? (solution)
- How do you perform preorder traversal in a given binary tree? (solution)
- How do you traverse a given binary tree in preorder without recursion? (solution)
- How do you perform an inorder traversal in a given binary tree? (solution)
- How do you print all nodes of a given binary tree using inorder traversal without recursion? (solution)
- How do you implement a postorder traversal algorithm? (solution)
- How do you traverse a binary tree in postorder traversal without recursion? (solution)
- How are all leaves of a binary search tree printed? (solution)
- How do you count a number of leaf nodes in a given binary tree? (solution)
- How do you perform a binary search in a given array? (solution)

- How is a bubble sort algorithm implemented? (solution)
- How is an iterative quicksort algorithm implemented? (solution)
- How do you implement an insertion sort algorithm? (solution)
- How is a merge sort algorithm implemented? (solution)
- How do you implement a bucket sort algorithm? (solution)
- How do you implement a counting sort algorithm? (solution)
- How is a radix sort algorithm implemented? (solution)
- How do you swap two numbers without using the third variable? (solution)
- How do you check if two rectangles overlap with each other? (solution)
- How do you design a vending machine? (solution)