PubMatic Interview Questions and Answers for Freshers

Q1. Write a code in c c++ or any other language to validate all use cases for an ip address given as input string. Output will be yes or no.
Ans. 
Code to validate all use cases for an IP address input string and output yes or no.
• Use regular expressions to match the input string against the valid IP address pattern.

• Check for valid ranges of each octet (0-255) and proper formatting (4 octets separated by periods).

• Handle edge cases like leading zeros, extra spaces, and invalid characters.

• Return 'yes' if the input string is a valid IP address, otherwise return 'no'.
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Q2. Given 2 sorted integer array print the common value between them. 2 to 3 optimized ways.
Ans. 
Find common values in two sorted integer arrays efficiently.
• Use two pointers approach to iterate through both arrays simultaneously.

• If the current values are equal, add it to the result and move both pointers forward.

• If the current values are not equal, move the pointer of the array with the smaller value forward.
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Q1. Basic DSA question on array, linked list, graph
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Q2. Loop in kinked list
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Q1. Similar question on DSA and little bit details on previous work experince.
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Q1. Standard managerial round with focus on previous work
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Q1. Join, window function excel vlookup, sumif,count etc.
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First round has few technical MCQ and 1 sql query question and 2 coding questions 1 is easy and 2 is medium

Q1. What if person mistakenly put F for male and M for female in sql how do you solve this
Ans. 
To solve the issue of mistakenly assigned gender values in SQL, you can update the incorrect values using SQL queries.
• Identify the incorrect gender values in the SQL table

• Use UPDATE statement with appropriate conditions to correct the values

• For example, if 'F' is mistakenly assigned for male, update it to 'M' using UPDATE statement
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Q2. Asked few linux command and mysql queries
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Q3. Basic oop and java questions
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Q1. Count the occurances a purticualar word from a file.
Ans. 
Count the occurrences of a particular word from a file.
• Read the file and store its contents in a string variable.

• Split the string into an array of words using a delimiter.

• Loop through the array and count the occurrences of the particular word.

• Return the count.
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Q2. Asked about personal projects
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