Dream11 Assistant Business Analytics Manager Interview Questions and Answers for Experienced

Remove consecutive characters in a string until no three consecutive characters remain.

• Use a stack to keep track of characters and their counts.

• Iterate through the string, pushing characters onto the stack.

• If the top of the stack has the same character, increment its count.

• If the count reaches 3, pop that character from the stack.

• Finally, reconstruct the string from the stack.

Rank assigns unique ranks to each distinct value, while dense rank does not leave gaps between ranks.

• Rank assigns unique ranks to each distinct value in a dataset

• Dense rank does not leave gaps between ranks, assigning consecutive ranks to values with the same rank

• For example, if values are 10, 20, 20, 30, then rank would be 1, 2, 2, 4 and dense rank would be 1, 2, 2, 3

Merge multiple files in Python using pandas.concat() or pd.merge() functions.

• Use pandas.concat() function to merge multiple files vertically (row-wise).

• Use pd.merge() function to merge multiple files horizontally (column-wise) based on a common column.

• Ensure that the files have compatible column names and data types before merging.

• Handle any missing or duplicate values appropriately during the merging process.

• Consider ...read more

A data frame is a two-dimensional data structure in which data is stored in rows and columns.

• Data frames are commonly used in programming languages like R and Python for data analysis.

• Each column in a data frame represents a variable, while each row represents an observation.

• Data frames can contain different types of data, such as numeric, character, and factor.

• Data frames can be created from various sources like CSV f...read more