Check if one can reach the last index in a list of hops starting with index 0

Check if doubly linked list is palindrome

Shortest substring containing all characters in a set

Return two prime numbers that sum to a given even number

Find Minimum Diameter After Merging Two Trees

Minimum Number of Operations to Sort a Binary Tree by Level

Maximum Number of K-Divisible Components

Reverse Odd Levels of Binary Tree Problem

Final Prices With a Special Discount in a Shop

Construct String With Repeat Limit

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