摘要： Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. Not 阅读全文

摘要： Given an input string, reverse the string word by word. A word is defined as a sequence of non-space characters. The input string does not contain lea 阅读全文

摘要： An abbreviation of a word follows the form <first letter><number><last letter>. Below are some examples of word abbreviations: a) it --> it (no abbrev 阅读全文