Level: Medium 题目描述: Given a string, find the length of the longest substring without repeating characters. Example 1: Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. Example 2: Input: "bbbbb&q
#定义一个方法,可进行列表相减 class V(object): def __init__(self,*value): self.value=value def __sub__(self,other): #取出较长的一个对象,并且取出短的对象的长度备用 r=len(self.value) s=len(other.value) if s>r: r,s=s,r l=[] #减法结果临时存放列表 for i in range(r): #当被减数位数长的时候,长出部分的计算方式是... if len(s
1.发现问题 今天在修改innodb表的某个列的长度时,报如下错误: alter table test2 modify column id varchar(500); ERROR 1071 (42000): Specified key was too long; max key length is 767 bytes alter table test2 modify column id varchar(500); ERROR 1071 (42000): Specified key was too
select `字段`, length(`字段`) from 表名 where length(`字段`) = ( select max(length(`字段`)) from 表名 )http://stackoverflow.com/questions/2357620/maxlengthfield-in-mysql