change the signs of the even index entries of the reversed vector
example 1 vec = [4 -1 -2 9] ans = [9 2 -1 -4]
example2 vec = [-4 -1 -2 -9] ans = [-9 2 -1 4]
The test suite has been expanded.
Clever
Arrange Vector in descending order
1437 Solvers
116 Solvers
353 Solvers
254 Solvers
264 Solvers