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Add C++ solution of problem #3191

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	`1`	`+class Solution {`
	`2`	`+public:`
	`3`	`+ int minOperations(vector<int>& A) {`
	`4`	`+ int n = A.size();`
	`5`	`+ int i = 0;`
	`6`	`+ int ans = 0;`
	`7`	`+ for(; i + 3 <= n; i++) {`
	`8`	`+ if(A[i])`
	`9`	`+ continue;`
	`10`	`+`
	`11`	`+ for(int j = i; j < i + 3; j++)`
	`12`	`+ A[j] ^= 1;`
	`13`	`+ ans++;`
	`14`	`+ }`
	`15`	`+`
	`16`	`+ for(; i < n; i++) {`
	`17`	`+ if(!A[i])`
	`18`	`+ return -1;`
	`19`	`+ }`
	`20`	`+ return ans;`
	`21`	`+ }`
	`22`	`+};`

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