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Two Sum - Easy

Given an array of integers and a target, return indices of two numbers that add up to target.

Python O(n)
def twoSum(nums, target): hash_map = {} for i, num in enumerate(nums): complement = target - num if complement in hash_map: return [hash_map[complement], i] hash_map[num] = i
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Practice Problems

Array Problems

Master fundamental array operations and algorithms

  • Two Sum
  • Maximum Subarray
  • Merge Sorted Arrays

String Problems

Practice string manipulation and pattern matching

  • Valid Palindrome
  • Longest Common Prefix
  • String to Integer (atoi)

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30-Day Array Challenge

Complete fundamental array problems in 30 days

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Binary Tree Mastery

Master tree traversal and manipulation algorithms

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Algorithm Insights

Learn from expert tutorials, tips, and programming insights

Data Structures

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Arrays

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Master array operations, two-pointer technique, sliding window, and prefix sums. Essential skills for coding interviews.

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Linked Lists

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Build linked lists from scratch. Learn singly, doubly, and circular linked lists with insertion, deletion, and traversal operations.

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