TopCoder Statistics - Problem Statement

Member Count: 484,641 - May 24, 2013 [Get Time]

Problem Statement

Problem Statement for TheSwap

Problem Statement

There is nothing more beautiful than just an integer number.

You are given an integer n. Write down n in decimal notation with no leading zeroes, and let M be the number of written digits. Perform the following operation exactly k times:

Choose two different 1-based positions, i and j, such that 1 <= i < j <= M. Swap the digits at positions i and j. This swap must not cause the resulting number to have a leading zero, i.e., if the digit at position j is zero, then i must be strictly greater than 1.

Return the maximal possible number you can get at the end of this procedure. If it's not possible to perform k operations, return -1 instead.

Definition

Class:	TheSwap
Method:	findMax
Parameters:	int, int
Returns:	int
Method signature:	int findMax(int n, int k)
(be sure your method is public)

Constraints

n will be between 1 and 1,000,000, inclusive.

k will be between 1 and 10, inclusive.

Examples

Returns: 76315

The optimal way is to swap 1 and 7.

Returns: 423

In this case the result is less than the given number.

Returns: -1

We can't make even a single operation because it would cause the resulting number to have a leading zero.

Returns: -1

Here we can't choose two different positions for an operation.

Returns: 966354

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This problem was used for:
Single Round Match 437 Round 1 - Division I, Level One
Single Round Match 437 Round 1 - Division II, Level Two