TopCoder problem "ProductsMatrix" used in TCHS SRM 9 (Division I Level Three)



Problem Statement

    Consider a square n x n matrix A. The cell Ai,j is equal to the product i * j (i, j are 1-based). Let's create a one-dimensional array which contains all the elements of the matrix A. The length of this array will be equal to n2. Sort this array and return the element which will be in the k-th position (k is a 1-based index).
 

Definition

    
Class:ProductsMatrix
Method:nthElement
Parameters:int, int
Returns:long
Method signature:long nthElement(int n, int k)
(be sure your method is public)
    
 

Constraints

-n will be between 1 and 10^5, inclusive.
-k will be between 1 and min(10^9, n^2), inclusive.
 

Examples

0)
    
3
7
Returns: 6
The matrix will be:
1 2 3
2 4 6
3 6 9
The array after sorting will be: {1, 2, 2, 3, 3, 4, 6, 6, 9}.
1)
    
2
4
Returns: 4
k is 1-based.
2)
    
3
8
Returns: 6
3)
    
1
1
Returns: 1
4)
    
4
4
Returns: 3

Problem url:

http://www.topcoder.com/stat?c=problem_statement&pm=6197

Problem stats url:

http://www.topcoder.com/tc?module=ProblemDetail&rd=10061&pm=6197

Writer:

Mike Mirzayanov

Testers:

PabloGilberto , brett1479 , Olexiy

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