Frontend Developer

You have been given a string ‘S’.

You must return the string ‘S’ sorted in decreasing order based on the frequency of characters.

If there are multiple answers, return any of them.

Example :

Let 'S'= “abAb”. 

Here the characters ‘a’ and ‘A’ have frequency 1 and character ‘b’ has frequency ‘2’.  

Therefore the sorted string is “bbAa”. 

1. OS Question
In priority scheduling algorithm ____________
a) CPU is allocated to the process with the highest priority
b) CPU is allocated to the process with the lowest priority
c) Equal priority processes can not be scheduled
d) None of the mentioned

2. OS Question
To avoid deadlock ____________
a) there must be a fixed number of resources to allocate
b) resource allocation must be done only once
c) all deadlocked processes must be aborted
d) inversion technique can be used

3. DBMS Question
Which of the following is a command of DDL?
1) Alter
2) Delete
3) Create
4) All of the Above

You are given 4 arrays 'ARR1’, 'ARR2’, 'ARR3’, 'ARR4’, each consists of ‘N’ numbers. Your task is to return the number of tuples (i, j, k, l) satisfying the following conditions:

0 <= i,j,k,l < ‘N’
ARR1[i] + ARR2[j] + ARR3[k] + ARR4[l] = 0.

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