Algorithms

This repository contains my solution for common algorithms. I've created this repository to learn about algorithms and improve solutions to common computer science problems. I'll try to add more solutions if I have time. :)

Each solution has a Java program and is tested. Some problems contain multiple solutions with different implementations.

You can check the solution executing tests inside tests directory. Some problems were resolved using TDD.

Problems

Trees

• Binary tree by level
• Binary tree pre order
• Binary tree in order
• Binary tree post order
• Are binary trees equals?
• Is binary search tree
• Binary tree depth
• Lowest common ancestor
• Sorted array to BST
• AVL tree median
• Path calculator
• Path to every leaf
• Is tree balanced
• Generate list with nodes by level

Linked List

• Reverse linked list
• Remove duplicates
• Find kth element
• Delete list node
• Partition list
• Sum lists
• PalindromeList
• Get element in the middle of the list

Strings

• Int to String
• Remove comments from file
• Reverse sentence
• Contains
• Simple regular expression
• Dot regular expression
• Asterisk regular expression
• Unique chars
• Reverse string
• Compress string
• Is rotation using substring

Binary Numbers and bits operators

• Is binary number even?
• Sum binary numbers
• Count the number of bits equals to 1
• Merge binary numbers
• Count the number of different bits
• Reverse binary number order
• Reverse binary number

Math Operations

• Square root
• Divide using subtraction
• Multiplication without multiply
• Find sums
• ScientificNotation
• Vector scalar product
• Subtract adding

Sequences

• Fibonacci numbers
• Factorial

Arrays

• Merge sorted arrays
• Split array in positive and negative numbers
• Remove duplicated elements
• Move zeros in array
• Find longest consecutive sequence
• Multiply array elements
• Move elements to position
• Replace spaces
• Rotate matrix
• Rewrite row and columns with zero
• Find the missing number

Sorting Algorithms

• Bubble Sort
• Selection Sort
• Insertion Sort
• Merge Sort
• [Quick Sort](htt