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描述：Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.If the last word does not exist, return 0.Note: A word

public Integer findGreatestSum(int[] arr){                    if(arr.length ==0)              return null;           int greatest = 0x80000000;          int curSum = 0;          for(int i 

Given a positive integer, return its corresponding column title as appear in an Excel sheet.For example: 1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 -> AB 代码：publ