Two Sum
EasyGiven an array of integers and a target sum, return indices of two numbers that add up to the target.
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Longest Palindromic Substring
MediumGiven a string, find the longest palindromic substring within it.
Merge K Sorted Lists
HardMerge k sorted linked lists and return it as one sorted list.
Valid Parentheses
EasyDetermine if the input string has valid parentheses.