Group 2015 Summer Internship research engineer Pen Test

1 Linux Packaging folder
2 Simple data structures
3 Write an SQL statement to find the user who has logged more than 1 times in the table user_id
4 Cashe mechanism
5 Hash exception
6 Processes, Threads
7 have 10G size files, each line records a waybill information, machine size is 500M, find out the most frequently
The first 1000 waybill number, give the idea.
81 CString string, inside is the lowercase letter "Abddlldk ..." (repeatable), write the program, find out
The largest substring with no repeating characters.
9 Talk about the situation of campus Express, give advice and suggestions.

Group 2015 Summer Internship research engineer Pen Test