Off the top of my head: 1. sum all the numbers 2. if the sum is odd, then return false 3. else determine if any set of numbers adds to half the sum

Off the top of my head: 1. sum all the numbers 2. if the sum is odd, then return false 3. else determine if any set of numbers adds to half the sum To determine if any set of numbers adds to half the sum: 1. choose a number and add it to the set 2. if the sum of the set is less than the number, add another number to the set 3. else remove a number from the set which numbers to add and remove can be done via brute force, but there is probably a better way.