Functionsยง
- find_
target_ sum_ ways - find_
target_ sum_ ways2 - analysis and dp sum(P) - sum(N) = target sum(P) + sum(N) + sum(P) - sum(N) = target + sum(P) + sum(N) 2 * sum(P) = target + sum(nums) so, if target + sum(nums) is not even, return 0, else get sum(P) == (target + sum(nums))/2