Summation

Rar the cat has a list of $N$ numbers in the range of $-10000$ to $10000$. He wants to know the maximum sum obtainable by either subtracting or adding the numbers. The sum starts with $0$ and you can either subtract or add a particular number in the list only once to the sum. ### Input - The first line will consist of a single integer, $N$. - The second line will consist of $N$ integers, in the r