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Dude questions

• When to use "$and" operator in mongodb?
• How to compute "shortest distance" between two words?
• How is broadcasting applying in this example of numpy?
• Time complexity of the java code
• Piping of grep is not working with tail? [duplicate]
• Caching of the data of a big file in memory in java
• Indentation of an IF-ELSE block in Python
• Map-reduce job giving ClassNotFound exception even though mapper is present when running with yarn?
• tr command not able to direct the Output?
• telnet a localhost [closed]

Dude answers