Difficulty:Medium
Prerequisites: Divide and conquer
Problem link:
Contest problem link
Practice problem link
Problem: To find the stack image when merge sort is called.
Explanation:
This problem can be solved in two ways:
 By simulating merge sort and printng
the calls made.

Using binary search:
In this approach the given size is divided into 2 parts using
mid=(L+R)/2;
if(mid>=N) //N is the index to be found
R=mid; //Shift the right pointer to middle i.e. index lies between middle and left
else
L=mid+1; //Shift the left pointer to middle+1 i.e. index lies between middle and right
Using the second one is more preferable.
Problem setter's solution: SOLUTION
asked
31 May '15, 01:01
2★preetam
6●2
accept rate:
0%