一、字段判断 (1)是否为空 select * from department where leader is NULL select * from department where leader is not NULL (2)是否为空字符‘’ select * from department where leader='' select * from department where
A+B Problem II 时间限制: 3000 ms | 内存限制: 65535 KB 难度: 3 描述 I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B. A,B must be posit
一、问题描述: Given a collection of intervals, merge all overlapping intervals. For example, Given [1,3],[2,6],[8,10],[15,18], return [1,6],[8,10],[15,18]. 二、解决思路: 针对间隔,按照start从小到大排序。(重写了sort方法)