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Add C++ solution for leetcode 268.

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	`1`	`+#include<vector>`
	`2`	`+#include<algorithm>`
	`3`	`+#include<iostream>`
	`4`	`+using namespace std;`
	`5`	`+`
	`6`	`+class Solution {`
	`7`	`+public:`
	`8`	`+ int missingNumber(vector<int>& nums) {`
	`9`	`+ const int len = nums.size(); // len = n-1`
	`10`	`+ int expectSum = len(len+1)/2; // (n-1)n/2`
	`11`	`+ int sum = 0;`
	`12`	`+ for (int i = 0; i < len; i++)`
	`13`	`+ sum += nums[i];`
	`14`	`+`
	`15`	`+ return (expectSum - sum);`
	`16`	`+ }`
	`17`	`+};`
	`18`	`+`
	`19`	`+// Test`
	`20`	`+int main()`
	`21`	`+{`
	`22`	`+ Solution sol;`
	`23`	`+ vector<int> nums = {9, 6, 4, 2, 3, 5, 7, 0, 1};`
	`24`	`+ auto res = sol.missingNumber(nums);`
	`25`	`+ cout << res << endl;`
	`26`	`+`
	`27`	`+ return 0;`
	`28`	`+}`

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