961. N-Repeated Element in Size 2N Array 集合+求和減法
In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times.
Return the element repeated N times.
Example 1:
Input: [1,2,3,3] Output: 3
Example 2:
Input: [2,1,2,5,3,2] Output: 2
Example 3:
Input:[5,1,5,2,5,3,5,4] Output: 5
Note:
4 <= A.length <= 100000 <= A[i] < 10000A.lengthis even
return int((sum(A)-sum(set(A))) // (len(A)//2-1))
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