Algorithm Examples

This section contains a collection of algorithm implementations in Echo, demonstrating how to solve various coding challenges. All source code is available in the repository's examples folder.

Array & List Manipulation

Learn how to work with arrays and lists through practical algorithm implementations.

• Add Two Numbers - Add two numbers represented as linked lists
• Container With Most Water - Find two lines that form a container with maximum area
• Remove Duplicates from Sorted Array - Remove duplicates in-place from sorted array
• Remove Element - Remove all instances of a value in-place
• Merge Two Sorted Lists - Merge two sorted linked lists
• Merge K Sorted Lists - Merge k sorted lists into one sorted list
• Jump Game II - Find minimum jumps to reach last index
• Remove Nth Node From End of List - Remove the nth node from end of list

Searching & Sorting

Algorithms for efficiently searching and sorting data.

• Search Insert Position - Find the index to insert target in sorted array
• Search in Rotated Sorted Array - Search in rotated sorted array
• First Missing Positive - Find first missing positive integer
• Find First Occurrence - Find first occurrence of substring
• Find First and Last Position - Find first and last position of target in sorted array
• Next Permutation - Generate next lexicographic permutation
• Permutations - Generate all permutations of a list
• Permutations II - Generate all unique permutations

String Manipulation

Work with strings and solve text processing challenges.

• Longest Palindromic Substring - Find longest palindromic substring
• Longest Substring Without Repeating Characters - Find longest substring without repeating chars
• Longest Valid Parentheses - Find length of longest valid parentheses
• Longest Common Prefix - Find longest common prefix of strings
• Letter Combinations of Phone Number - Generate letter combinations of phone number
• Substring with Concatenation of All Words - Find all substring concatenations
• String to Integer (atoi) - Convert string to integer
• Reverse Integer - Reverse digits of integer
• Palindrome Number - Check if number is palindrome
• Regular Expression Matching - Match string with pattern including '.' and '*'
• Wildcard Matching - Match string with wildcard pattern
• Valid Parentheses - Check if parentheses are valid
• Group Anagrams - Group anagrams together
• Multiply Strings - Multiply two numbers as strings
• Zigzag Conversion - Convert string to zigzag pattern

Math & Number Operations

Mathematical algorithms and number manipulations.

• Integer to Roman - Convert integer to Roman numeral
• Roman to Integer - Convert Roman numeral to integer
• Divide Two Integers - Divide two integers without using division operator
• Power of x, n - Calculate x to the power of n
• Two Sum - Find two numbers that add up to target
• Three Sum - Find all triplets that sum to zero
• Three Sum Closest - Find three sum closest to target
• Four Sum - Find all quadruplets that sum to target
• Trapping Rain Water - Calculate water trapped between elevations
• Median of Two Sorted Arrays - Find median of two sorted arrays

Matrix & Grid Problems

Solve problems involving matrices and grids.

• Rotate Image - Rotate image 90 degrees
• Valid Sudoku - Validate Sudoku board
• Solve Sudoku - Solve Sudoku using backtracking

Linked List Operations

Work with linked list data structures.

• Swap Nodes in Pairs - Swap adjacent nodes in linked list
• Reverse Nodes in K-Group - Reverse nodes of list k at a time

Miscellaneous

• Generate Parentheses - Generate all valid parentheses combinations
• Language Feature Smoke Test - Test various Echo language features

Getting Started with Examples

To run any of these examples locally:

python echolang.bat path/to/example.echo

Or clone the repository and run directly:

git clone https://github.com/deekshith-poojary98/echo.git
cd echo
echo examples/two_sum.echo

See Also

• Hello World - Simple getting started example
• Mini Programs - Short practical programs
• Functions in Practice - Working with functions
• Lists in Practice - Working with lists
• Hash Usage - Working with hash maps