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2.6 Exercises

Basic Difficulty​

633. Sum of Square Numbers​

A variation of the Two Sum problem.

680. Valid Palindrome II​

Another variation of the Two Sum problem.

524. Longest Word in Dictionary through Deleting​

A variation of the Merge Sorted Array problem.

Advanced Difficulty​

340. Longest Substring with At Most K Distinct Characters​

Requires the use of additional data structures to facilitate tracking the current character states.