Given a vector of numbers, negate all elements contained within.

• Negating a positive value -+n will return -n, because all +'s are removed.
• Negating a negative value --n will return n, because the first - turns the second minus into a +.

Examples

negate({1, 2, 3, 4}) ➞ {-1, -2, -3, -4}

negate({-1, 2, -3, 4}) ➞ {1, -2, 3, -4}

negate({}) ➞ {}

Notes

If you get an empty vector, return an empty vector: {}