Exceller (Software developer)

You have been given an array/list of integers 'ARR' of size 'N'. Your task is to find two things-

1. The number of elements that are occurring an Odd number of times.

2. The number of elements that are occurring Even a number of times.

For Example:

ARR = [2, 1, 2, 1, 5, 5, 2]    
Output: 1 2 

2 occurs three(odd) times.
1 occurs two(even) times.
5 occurs two(even) times.

So, the total 1 element is occurring an odd number of times and 2 elements are occurring an even number of times.

What is the output of the following code snippet?

#include <stdio.h> 

int main() { 

int y = 1; 

if (y & (y = 2)) 

  printf("true %d\n", y); 

else printf("false %d\n", y);

}

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(A) do-while
(B) while
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(B) Linked List
(C) Deque
(D) Queue

What is the time complexity of the Bubble Sort algorithm? 

(A) O(n²) 

(B) O(n) 

(C) O(n log n)

You are given a string 'S' of length 'N', you need to find the frequency of each of the characters from ‘a’ to ‘z’ in the given string.

Example :

Given 'S' : abcdg
Then output will be : 1 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

You are given a string 'str' of length 'N'.

Your task is to reverse the original string word by word.

There can be multiple spaces between two words and there can be leading or trailing spaces but in the output reversed string you need to put a single space between two words, and your reversed string should not contain leading or trailing spaces.

Example :

If the given input string is "Welcome to Coding Ninjas", then you should return "Ninjas Coding to Welcome" as the reversed string has only a single space between two words and there is no leading or trailing space.

• Introduce yourself.
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What are your strengths and weaknesses?