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Given a strings, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can find by performing this transformation.Example 1:...

A character is unique in stringSif it occurs exactly once in it.For example, in stringS = "LETTER", the only unique characters are"L"and"R".Let's defineUNIQ(S)as the number of unique chara...

You haveklists of sorted integers in ascending order. Find thesmallestrange that includes at least one number from each of theklists.We define the range [a,b] is smaller than range [c,d] ifb-...

Given an arrayAof positive integers, call a (contiguous, not necessarily distinct) subarray ofAgoodif the number of different integers in that subarray is exactlyK.(For example,[1,2,3,1,2]ha...

Given a string, find the length of the longest substring T that contains at most k distinct characters.Example 1:Input: s = "eceba", k = 2Output: 3Explanation: T is "ece" which its length is 3....