Suppose A and B are two friends. They have candy bars of different sizes. Here A[i] is the size of the i-th bar of candy owned by A, and B[j] is the size of the j-th bar of candy owned by B.
Since they are friends, they want to exchange one candy bar each so that after the exchange, both A and B have the same total amount of candy. (The total amount of candy a person has is the sum of the sizes of candy bars they have.) We have to return an integer array suppose ans, where ans is the size of the candy bar that A must exchange, and ans is the size of the candy bar that B must exchange. If there are multiple answers, we will return only one of them.
For example, if A = [1, 2] and B = [2, 3], then output will be [1, 2]
To solve this, we will follow these steps −
Let us see the following implementation to get better understanding −
class Solution(object): def fairCandySwap(self, A, B): """ :type A: List[int] :type B: List[int] :rtype: List[int] """ diff = (sum(A) - sum(B))//2 B=set(B) for i in A: if i- diff in B: return [i,i-diff]