It is a two-screen process at Yahoo. The interviewers are great and help in case you get stuck. They basically check your programming knowledge and logical concepts. Even if you write the code a bit incorrectly, it won't affect your result unless you tell them the correct algorithm.

Things that should be prepared before the interview include:

• Linked Lists
• Stacks
• Queues
• Arrays and Strings
• Searching and Sorting
• Trees and Graphs

Check if the string is balanced. For example, {{}} should return true.

Given an input sentence, tokenize it and print the word count. For example, the boy went to the school -> the 2, boy 1, went 1, to 1, school 1.