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Add C++ solution for leetcode 367.

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	`1`	`+#include<vector>`
	`2`	`+#include<algorithm>`
	`3`	`+#include<iostream>`
	`4`	`+using namespace std;`
	`5`	`+`
	`6`	`+class Solution {`
	`7`	`+public:`
	`8`	`+ bool isPerfectSquare(int num) {`
	`9`	`+ int i = 1; // i: 表示奇数, 1是用于下面循环的奇数初始值`
	`10`	`+ while (num > 0)`
	`11`	`+ {`
	`12`	`+ num -= i;`
	`13`	`+ i += 2;`
	`14`	`+ }`
	`15`	`+ if (num == 0) return true;`
	`16`	`+ return false;`
	`17`	`+ }`
	`18`	`+};`
	`19`	`+`
	`20`	`+// Test`
	`21`	`+int main()`
	`22`	`+{`
	`23`	`+ Solution sol;`
	`24`	`+ int num = 14;`
	`25`	`+ auto res = sol.isPerfectSquare(num);`
	`26`	`+ cout << (res ? "True" : "False") << endl;`
	`27`	`+`
	`28`	`+ return 0;`
	`29`	`+}`

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