g2201_2300.s2202_maximize_the_topmost_element_after_k_moves

Class Solution

java.lang.Object

g2201_2300.s2202_maximize_the_topmost_element_after_k_moves.Solution

public class Solution
extends Object

2202 - Maximize the Topmost Element After K Moves.

Medium

You are given a 0-indexed integer array nums representing the contents of a pile , where nums[0] is the topmost element of the pile.

In one move, you can perform either of the following:

• If the pile is not empty, remove the topmost element of the pile.
• If there are one or more removed elements, add any one of them back onto the pile. This element becomes the new topmost element.

You are also given an integer k, which denotes the total number of moves to be made.

Return the maximum value of the topmost element of the pile possible after exactly k moves. In case it is not possible to obtain a non-empty pile after k moves, return -1.

Example 1:

Input: nums = [5,2,2,4,0,6], k = 4

Output: 5

Explanation:

One of the ways we can end with 5 at the top of the pile after 4 moves is as follows:

• Step 1: Remove the topmost element = 5. The pile becomes [2,2,4,0,6].

• Step 2: Remove the topmost element = 2. The pile becomes [2,4,0,6].

• Step 3: Remove the topmost element = 2. The pile becomes [4,0,6].

• Step 4: Add 5 back onto the pile. The pile becomes [5,4,0,6].

Note that this is not the only way to end with 5 at the top of the pile. It can be shown that 5 is the largest answer possible after 4 moves.

Example 2:

Input: nums = [2], k = 1

Output: -1

Explanation:

In the first move, our only option is to pop the topmost element of the pile.

Since it is not possible to obtain a non-empty pile after one move, we return -1.

Constraints:

• 1 <= nums.length <= 105
• 0 <= nums[i], k <= 109

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	maximumTop(int[] nums, int k)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

maximumTop

public int maximumTop(int[] nums,
                      int k)