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Empty an Array by removing maximum of K value from it
• Last Updated : 20 May, 2021

Given an array arr of size N and a value K, the task is to empty this array by removing a maximum of K from it. Print the value removed if the array was emptied, else -1.
Examples:

Input: arr[] = {2, 2}, K = 5
Output:
Explanation:
After removing arr[1] (=2) from K (=5), K = 5 – 2 = 3
After removing arr[2] (=2) from K (=3), K = 3 – 2 = 1
Since the array has been emptied and K is still > 0
Therefore the value removed = 2 + 2 = 4
Input: arr[] = {5, 3, 2, 2}, K = 10
Output: -1
Explanation:
After removing arr[1] (=5) from K (=10), K = 10 – 5 = 5
After removing arr[2] (=3) from K (=5), K = 5 – 3 = 2
After removing arr[3] (=2) from K (=2), K = 2 – 2 = 0
After removing arr[4] (=2) from K (=0), K = 0 – 2 = -2
Since the array has been emptied and K is < 0
Therefore the array cannot be emptied for this K
hence the output is -1

Approach:

• The given problem can be observed as finding the total sum of the array arr and removing this sum from K.

• If this sum is less than or equal to K, then the array can be emptied and the output will be the sum of the array.

• Else the output will be -1.

Below is the implementation of the above approach:

## C++

 `// C++ program to empty an Array``// by removing a maximum of K value from it` `#include ``using` `namespace` `std;` `// Function to Empty an Array by removing``// maximum of K value from it``void` `emptyArray(``long` `long` `int` `n,``                ``long` `long` `int` `k,``                ``long` `long` `int` `arr[])``{``    ``long` `long` `int` `sum = 0, i;` `    ``// Find the total sum of the array``    ``for` `(i = 0; i < n; i++)``        ``sum += arr[i];` `    ``// Find if sum is less than or equal to K``    ``if` `(sum <= k)``        ``cout << sum << ``"\n"``;``    ``else``        ``cout << -1 << ``"\n"``;``}` `// Driver code``int` `main()``{` `    ``long` `long` `int` `n = 2, k = 5;``    ``long` `long` `int` `arr[] = { 2, 2 };` `    ``emptyArray(n, k, arr);` `    ``n = 4, k = 10;``    ``long` `long` `int` `arr1[] = { 5, 3, 2, 2 };` `    ``emptyArray(n, k, arr1);` `    ``return` `0;``}`

## Java

 `// Java program to empty an Array``// by removing a maximum of K value from it``class` `GFG``{``    ` `    ``// Function to Empty an Array by removing``    ``// maximum of K value from it``    ``static` `void` `emptyArray(``int` `n, ``int` `k, ``int` `arr[])``    ``{``        ``int` `sum = ``0``, i;``    ` `        ``// Find the total sum of the array``        ``for` `(i = ``0``; i < n; i++)``            ``sum += arr[i];``    ` `        ``// Find if sum is less than or equal to K``        ``if` `(sum <= k)``            ``System.out.println(sum);``        ``else``            ``System.out.println(-``1``);``    ``}``    ` `    ``// Driver code``    ``public` `static` `void` `main (String[] args)``    ``{``        ``int` `n = ``2``;``        ``int` `k = ``5``;``        ``int` `arr[] = { ``2``, ``2` `};``    ` `        ``emptyArray(n, k, arr);``    ` `        ``n = ``4``; k = ``10``;``        ``int` `arr1[] = { ``5``, ``3``, ``2``, ``2` `};``    ` `        ``emptyArray(n, k, arr1);``    ``}``}` `// This code is contributed by AnkitRai01`

## Python3

 `# Python program to empty an Array``# by removing a maximum of K value from it` `# Function to Empty an Array by removing``# maximum of K value from it``def` `emptyArray(n, k, arr) :` `    ``sum` `=` `0``;` `    ``# Find the total sum of the array``    ``for` `i ``in` `range``(n) :``        ``sum` `+``=` `arr[i];` `    ``# Find if sum is less than or equal to K``    ``if` `(``sum` `<``=` `k) :``        ``print``(``sum``);``    ``else` `:``        ``print``(``-``1``);` `# Driver code``if` `__name__ ``=``=` `"__main__"` `:` `    ``n ``=` `2``; k ``=` `5``;``    ``arr ``=` `[ ``2``, ``2` `];` `    ``emptyArray(n, k, arr);` `    ``n ``=` `4``; k ``=` `10``;``    ``arr1 ``=` `[ ``5``, ``3``, ``2``, ``2` `];` `    ``emptyArray(n, k, arr1);` `# This code is contributed by AnkitRai01`

## C#

 `// C# program to empty an Array``// by removing a maximum of K value from it``using` `System;` `class` `GFG``{``    ` `    ``// Function to Empty an Array by removing``    ``// maximum of K value from it``    ``static` `void` `emptyArray(``int` `n, ``int` `k, ``int` `[]arr)``    ``{``        ``int` `sum = 0, i;``    ` `        ``// Find the total sum of the array``        ``for` `(i = 0; i < n; i++)``            ``sum += arr[i];``    ` `        ``// Find if sum is less than or equal to K``        ``if` `(sum <= k)``            ``Console.WriteLine(sum);``        ``else``            ``Console.WriteLine(-1);``    ``}``    ` `    ``// Driver code``    ``public` `static` `void` `Main(String[] args)``    ``{``        ``int` `n = 2;``        ``int` `k = 5;``        ``int` `[]arr = { 2, 2 };``    ` `        ``emptyArray(n, k, arr);``    ` `        ``n = 4; k = 10;``        ``int` `[]arr1 = { 5, 3, 2, 2 };``    ` `        ``emptyArray(n, k, arr1);``    ``}``}` `// This code is contributed by PrinciRaj1992`

## Javascript

 ``
Output:
```4
-1```

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