🧩 Hash Table Mastery List

✅ Easy

# Title Link Done
1 Two Sum 🔗 LeetCode ☐
217 Contains Duplicate 🔗 LeetCode ☐
242 Valid Anagram 🔗 LeetCode ☐
349 Intersection of Two Arrays 🔗 LeetCode ☐
202 Happy Number 🔗 LeetCode ☐

🟡 Medium

# Title Link Done
3 Longest Substring Without Repeating Characters 🔗 LeetCode ☐
49 Group Anagrams 🔗 LeetCode ☐
347 Top K Frequent Elements 🔗 LeetCode ☐
36 Valid Sudoku 🔗 LeetCode ☐
128 Longest Consecutive Sequence 🔗 LeetCode ☐
219 Contains Duplicate II 🔗 LeetCode ☐
560 Subarray Sum Equals K 🔗 LeetCode ☐
451 Sort Characters By Frequency 🔗 LeetCode ☐
981 Time Based Key-Value Store 🔗 LeetCode ☐
49 Group Anagrams 🔗 LeetCode ☐

🟥 Hard

# Title Link Done
76 Minimum Window Substring 🔗 LeetCode ☐
895 Maximum Frequency Stack 🔗 LeetCode ☐
30 Substring with Concatenation of All Words 🔗 LeetCode ☐
432 All O`one Data Structure 🔗 LeetCode ☐