HashMap
- 🟩 1. Two Sum [Solution]
- 🟩 OddOccurrencesInArray [Solution]
- 🟥 41. First Missing Positive [Solution]
- 🟨 49. Group Anagrams [Solution]
- 🟨 128. Longest Consecutive Sequence [Solution]
- 🟥 149. Max Points on a Line [Solution]
- 🟩 202. Happy Number [Solution]
- 🟩 205. Isomorphic Strings [Solution]
- 🟩 217. Contains Duplicate [Solution]
- 🟩 219. Contains Duplicate II [Solution]
- 🟩 242. Valid Anagram [Solution]
- 🟨 274. H-Index [Solution]
- 🟩 290. Word Pattern [Solution]
- 🟩 383. Ransom Note [Solution]
- 🟩 409. Longest Palindrome [Solution]
- 🟨 525. Contiguous Array [Solution]
- 🟨 846. Hand of Straights [Solution]
- 🟩 1122. Relative Sort Array [Solution]
- 🟩 1460. Make Two Arrays Equal by Reversing Subarrays [Solution]
- 🟩 2053. Kth Distinct String in an Array [Solution]
- 🟨 3223. Minimum Length of String After Operations [Solution]