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Add C++ solution of problem #3392

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	`1`	`+class Solution {`
	`2`	`+public:`
	`3`	`+ int countSubarrays(vector<int>& A) {`
	`4`	`+ int ans = 0;`
	`5`	`+ for(int i = 0; i < A.size() - 2; i++) {`
	`6`	`+ int a = A[i];`
	`7`	`+ int b = A[i + 1];`
	`8`	`+ int c = A[i + 2];`
	`9`	`+ if(2 * (a + c) == b)`
	`10`	`+ ans++;`
	`11`	`+ }`
	`12`	`+ return ans;`
	`13`	`+ }`
	`14`	`+};`

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