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solves 2656: Maximum Sum With Exactly K Elements in java

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`818`	`818`	`\| 2644 \| [Find the Maximum Divisibility Score](https://leetcode.com/problems/find-the-maximum-divisibility-score) \| [![Java](assets/java.png)](src/FindTheMaximumDivisibilityScore.java) \| \|`
`819`	`819`	`\| 2651 \| [Calculate Delayed Arrival Time](https://leetcode.com/problems/calculate-delayed-arrival-time) \| [![Java](assets/java.png)](src/CalculateDelayedArrivalTime.java) \| \|`
`820`	`820`	`\| 2652 \| [Sum Multiples](https://leetcode.com/problems/sum-multiples) \| [![Java](assets/java.png)](src/SumMultiples.java) \| \|`
`821`		`-\| 2656 \| [Maximum Sum With Exactly K Elements](https://leetcode.com/problems/maximum-sum-with-exactly-k-elements) \| \| \|`
	`821`	`+\| 2656 \| [Maximum Sum With Exactly K Elements](https://leetcode.com/problems/maximum-sum-with-exactly-k-elements) \| [![Java](assets/java.png)](src/MaximumSumWithExactlyKElements.java) \| \|`
`822`	`822`	`\| 2660 \| [Determine the Winner of a Bowling Game](https://leetcode.com/problems/determine-the-winner-of-a-bowling-game) \| \| \|`
`823`	`823`	`\| 2670 \| [Find the Distinct Difference Array](https://leetcode.com/problems/find-the-distinct-difference-array) \| \| \|`
`824`	`824`	`\| 2678 \| [Number of Senior Citizens](https://leetcode.com/problems/number-of-senior-citizens) \| \| \|`

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	`1`	`+// https://leetcode.com/problems/maximum-sum-with-exactly-k-elements`
	`2`	`+// T: O(n)`
	`3`	`+// S: O(1)`
	`4`	`+`
	`5`	`+import java.util.Arrays;`
	`6`	`+`
	`7`	`+public class MaximumSumWithExactlyKElements {`
	`8`	`+ public int maximizeSum(int[] nums, int k) {`
	`9`	`+ final int maxElement = Arrays.stream(nums).max().getAsInt();`
	`10`	`+ return maxElement * k + summation(k - 1);`
	`11`	`+ }`
	`12`	`+`
	`13`	`+ private int summation(int x) {`
	`14`	`+ return (x * (x + 1)) / 2;`
	`15`	`+ }`
	`16`	`+}`

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