摘要：
An abbreviation of a word follows the form . Below are some examples of word abbreviations:a) it --> it (no abbreviation) ... 阅读全文
摘要：
Given an unsorted arraynums, reorder itin-placesuch thatnums[0] = nums[2] = nums[i - 1];Ifiis even, thennums[i] nums[i-1])){ swap(nums... 阅读全文
摘要：
Given an array withnobjects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, wh... 阅读全文
摘要：
Given a string, we can "shift" each of its letter to its successive letter, for example:"abc" -> "bcd". We can keep "shifting" which forms the sequenc... 阅读全文
摘要：
Given a sorted integer array without duplicates, return the summary of its ranges.For example, given[0,1,2,4,5,7], return["0->2","4->5","7"].解题思路：直观思路... 阅读全文
摘要：
Description:Count the number of prime numbers less than a non-negative number,n.解题思路：神一样的提示一步步给出了最佳解法。The Sieve of Eratosthenes uses an extra O(n) mem... 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 lead... 阅读全文
摘要：
Given an input string, reverse the string word by word.For example,Given s = "the sky is blue",return "blue is sky the".解题思路：用trim() 和splite("\\s+")把S... 阅读全文
摘要：
Rotate an array ofnelements to the right byksteps.For example, withn= 7 andk= 3, the array[1,2,3,4,5,6,7]is rotated to[5,6,7,1,2,3,4].Note:Try to come... 阅读全文