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solution.js
1// Two Sum – O(n) with HashMap
2function twoSum(nums, target) {
3  const map = new Map();
4  for (let i = 0; i < nums.length; i++) {
5    const comp = target - nums[i];
6    if (map.has(comp)) return [map.get(comp), i];
7    map.set(nums[i], i);
8  }
9}
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DSA

Mastering Binary Trees: Patterns You Must Know

Discover the 8 most important tree traversal and manipulation patterns that appear repeatedly in FAANG interviews.

May 22, 2026 8 min read
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How to Design a URL Shortener from Scratch

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May 19, 2026 12 min read
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Dynamic Programming

The Ultimate DP Patterns Guide for 2026

Break down every major DP pattern — knapsack, LIS, matrix chain, interval DP — with visual explanations.

May 14, 2026 15 min read

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