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← Roadmapsall hashing problems
#️⃣

Hashing

Lookups, dedup, grouping, frequency, subarray sums.

5 stops · 58 problems0/35 on the path done
next ▸ Contains DuplicateSilver · 1000
1

Lookups & dedup

0/9you are here

Two sum, contains duplicate, nearby duplicate.

○Contains Duplicate○Two Sum○First Unique Character○Intersection of Two Arrays○Contains Nearby Duplicate○Intersection With Counts○First Unique Index○Multiset Intersection○Find All Duplicates
2

Grouping

0/1

Group anagrams, isomorphic, word pattern, sudoku.

○Isomorphic Strings
3

Frequency & top-K

0/7

Top-k frequent, frequency sort.

○Count Even Frequency Values○Count Odd Frequency Values○Value With Frequency K○Smallest Top Frequency○Frequency Of Frequencies○Top K Frequent Elements○Word Frequency Count
4

Subarray sums & sets

0/2

Subarray sum k, longest consecutive, 4-sum count.

○Subarray Sum Equals K○4Sum Count
5

More Hashing

0/16 of 39

Everything else in this category — keep climbing.

○Distribute Candies○Uncommon Words from Sentences○Majority Element○Single Number○Max Number of K-Sum Pairs○First Repeating Index○Count Duplicated Values○Max Single Value Run○Longest Harmonious Subsequence○Is One To N Permutation○Set Difference Sorted○Can Pair Up Equal○Most Frequent Char○Same Multiset○Ransom Buildable○Equal Value Pairs+23 in the arena
🏁Finish line