Tag Archives: Dynamic Programming

[Hackerrank] – Two Characters

A string is said to be valid when it has only distinct characters and none of them repeat simultaneously. For example, if string ‘s two distinct characters are x and y, then valid examples could be xyxyx or yxyxy but not xxyy or xyyx. Question: Given a sample string, we need to determine what is the maximum length… Read More »

Next lexicographic string permutation

Question: Given a string, find the next lexicographic permutation. Input: abc Output: acb First of all let us try to understand what do you mean by next lexicographic string. To get a hold of the concept try to remember an English dictionary and how words are arranged in it. We start with the letter ‘a’, write all the… Read More »