Hash-map [mp]

Micro pattern¶

Problems¶

Frequency¶

• 242. Valid Anagram (Top Easy)
• 387. First Unique Character in a String (Top Easy)
• 350. Intersection of Two Arrays II (Top Easy)

Grouping¶

• 49. Group Anagrams (Top Medium)

Value to index¶

• 1. Two Sum (Top Easy)
• 3. Longest Substring Without Repeating Characters (Top Medium)
• 105. Construct Binary Tree from Preorder and Inorder Traversal (Top Medium)
• 166. Fraction to Recurring Decimal (Top Medium)
• 380. Insert Delete GetRandom O(1) (Top Medium)

Miscelaneous¶

• Tries (DSA)
• Hash Table Implementation (DSA)
• 290. Word Pattern (Google Prep)