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Google SWE Internship 2021 Interview Experience

Last Updated : 25 Aug, 2020
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Hi Geeks, I have applied for Google SWE Internship 2021 (India) and I have been selected and invited for Google’s Online Challenge Round  

Application: I have applied through LinkedIn, it is really a great platform for opportunities and I received mail from Google on 12 Aug 2020 and it was a great experience for me. 

I am here to share questions that have been asked in coding challenges. I hope I will help you. 

Round 1:

Question 1: Array queries: You are given an array of integers whose length is N, you must perform the following five types of query on the given array : 

  1. Left: Perform one cyclic left rotation.
  2. Right: Perform one cyclic right rotation.
  3. Update Pos Value: Update the value at index Pos of the array by Val.
  4. Increment Pos: Increment value at index Pos of the array by 1.
  5. Pos: Print the current value at index Pos.

All the queries are performed considering 1-based indexing. 


  • One cyclic left rotation changes (arr1, arr2, arr3, . . . , arrN-1, arrN) to (arr2, arr3, . . .arrN-1, arrN, arr1).
  • One cyclic right rotation changes (arr1, arr2, arr3, . . . , arrN-1, arrN) to (arrN, arr1, arr2, arr3, . . .arrN-1).

Input format 

  • The first line contains an integer N denoting the length of the array.
  • The second line contains N space-separated integers denoting the elements of the array.
  • The third line contains an integer Q denoting the number of queries.
  • Next, Q lines contain the described type of query.

Output format: For each query of type 5, print the output in a new line.


2 ≤ N ≤ 5 x 105
2 ≤ Q ≤ 5 x 105
1 ≤ Pos ≤ N
0 ≤ arri , Val ≤ 105

It is guaranteed that at least one query is of type 5.

Sample Input 1

0 3 3 8 0 6 9 3 2 8
Increment 3
Increment 1
Increment 5
? 9

Sample Output 1


Question 2:There are N-words in a dictionary such that each word is of fixed length M and consists of only lowercase English letters that are (‘a’, ‘b’, ……. ‘z’).

A query word denoted by Q. The length of query word in M. These words contain lowercase English letters but at some places instead of a letter between ‘a’, ‘b’, ……. ‘z’ there is ‘?’ .Refer to the Sample input section to understand this case.

A match count of Q, denoted by match_count(Q), is the count of words that are is the dictionary and contain the same English letters (excluding a letter that can be in the position of ?) in the same position as the letters are there are in the query word Q.

In other words, a word in the dictionary can contain any letters at the position ‘?’ but the remaining alphabets must match with the query word.

You are given a query word Q and you are required to compute match_count(Q).

Input format

  • First-line contains two space-separated integers M and  N denoting the number of words in the dictionary and length of each word respectively.
  • The next N lines contain one word each from the dictionary.
  • The next line contains an integer Q denoting the number of query words for which u have to compute match_count()
  • The next Q lines contain one query word each.

Output format

For each query word, print match_count for specific words in a new line.


1 ≤ N ≤ 5 x 104
1 ≤ M ≤ 7
1 ≤ Q ≤ 105

Sample Input 

5 3

Sample Output


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