Citicorp Manager Interview Questions, Process, and Tips

Implementing a thread-safe linked list in C++

• Use mutex locks to ensure only one thread can access the list at a time

• Implement functions for thread-safe insertion, deletion, and traversal

• Consider using condition variables to notify waiting threads of changes in the list

Inserting an element in a map using C++ code

• Use the insert() function to add a key-value pair to the map

• If the key already exists, the value will not be updated

• If you want to update the value for an existing key, you can use the subscript operator []

SQL performance techniques

• Use indexes to speed up queries

• Avoid using SELECT * and only select necessary columns

• Use stored procedures to reduce network traffic

• Avoid using subqueries and instead use JOINs

• Use EXPLAIN to analyze query performance

• Normalize database tables to reduce redundancy

• Use connection pooling to reduce overhead

• Avoid using cursors and use set-based operations instead

A Linux shell script can be used to read and parse a flat file.

• Use the 'read' command to read the file line by line

• Use 'cut' command to parse the data based on delimiter

• Use 'awk' command to filter and manipulate data

• Use 'sed' command to search and replace data

• Use 'grep' command to search for specific patterns in the file