2022.3.14 Ali written test

1. Single topic selection ：Linux, operating system 、 database

2、 Multiple choice ： operating system 、UDP flow 、 Database view

3、 Algorithm problem ：

3.1 16 Binary to binary statistics 1 Number of occurrences

3.2 One n*m Matrix , There are two numbers ,0 and 1,0 Represents the location of the flashlight ,1 Represents the target , Standing on the 0 The position of can irradiate up, down, left and right , And the range is infinite , After finding the given matrix , A target object that can be illuminated （ It means something like this ）

3.3 The last question is Xiaole , Can not do , I didn't remember the title .