unknown Interview Question for Software Developers

Country: India
Interview Type: Written Test

Comment hidden because of low score. Click to expand.
of 1 vote

#include <stdio.h>

int find_s(int * a, int l)

        int down = 0;
        int up = (l-1);
        int mid;
        while(down < up)
                mid = (down+up)/2;
                printf("\n mid = %d",mid);
                if(a[mid] < a[mid - 1])
                        return (mid - 1);
                        if(a[mid] > a[down])
                                down = mid + 1;
                                up = mid ;

        return -1;


int main()
int b[5] = {3,4,5,1,2};
int k;
k = find_s(b,5);
printf("\nk = %d\n",k);
return 0;

Does it in O(logn) times. If k is provided , then you don't need the algorithm.

- Engineer1111 October 11, 2018 | Flag Reply
Comment hidden because of low score. Click to expand.
of 0 vote

Any body got confused with "rotated by k positions". Does it mean k is known ?

I interpreted as k is known. So that answer should be O(1) in my opinion.

The expected answer is O(logn).

I think the interpretation should be rotated randomly by k position, k being, unknown.

What do others think ?

- __Joker October 10, 2018 | Flag Reply
Comment hidden because of low score. Click to expand.
of 0 vote

log(n), using modified binary search

- Anonymous October 11, 2018 | Flag Reply

Add a Comment

Writing Code? Surround your code with {{{ and }}} to preserve whitespace.


is a comprehensive book on getting a job at a top tech company, while focuses on dev interviews and does this for PMs.

Learn More


CareerCup's interview videos give you a real-life look at technical interviews. In these unscripted videos, watch how other candidates handle tough questions and how the interviewer thinks about their performance.

Learn More

Resume Review

Most engineers make critical mistakes on their resumes -- we can fix your resume with our custom resume review service. And, we use fellow engineers as our resume reviewers, so you can be sure that we "get" what you're saying.

Learn More

Mock Interviews

Our Mock Interviews will be conducted "in character" just like a real interview, and can focus on whatever topics you want. All our interviewers have worked for Microsoft, Google or Amazon, you know you'll get a true-to-life experience.

Learn More