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Write an O(1) function that takes a single integer, n, as its argument and returns the sum of all integers from 0 through n. (Note:
Write an O(1) function that takes a single integer, n, as its argument and returns the sum of all integers from 0 through n. (Note: n could be negative. So, for example, sum(-3) should return 0 + -1 + -2 + -3, which is -6.) Credit will only be awarded if your function is O(1).
int fastSum(int n)
{
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