Commit ab93d30

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add cpp version(do not use set)

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	`1`	`+class Solution {`
	`2`	`+public:`
	`3`	`+ int repeatedNTimes(vector<int>& A) {`
	`4`	`+ unordered_set<int> us(A[0]) ;`
	`5`	`+ for(int i = (A.size() >> 1) - 1; i < A.size(); ++i)`
	`6`	`+ if(us.find(A[i]) != us.end())`
	`7`	`+ return A[i] ;`
	`8`	`+ else`
	`9`	`+ us.insert(A[i]) ;`
	`10`	`+ return A[0] ;`
	`11`	`+ }`
	`12`	`+};`

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