求解旋转词问题

#include
#include
#include
#include
#include
using namespace std;

string isCircle(string, string);

void main() {
	int n; //line
	int m = 2; //column
	cout << "请输入行数：";
	cin >> n;
	
	//初始化vector空间
	vector res(n); //判断结果
	vector> arr(n); //2维数组
	for (int i = 0; i < n; i++) {
		arr[i].resize(m);
	}

	cout << "请依次输入字符串：" << endl;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cin>>arr[i][j];
		}
		res[i] = isCircle(arr[i][0], arr[i][1]); //判断旋转词
	}

	for (int i = 0; i < n; i++) {
		cout << res[i] << endl;
	}
}

string isCircle(string str1,string str2) {
	string str = str1 + str1;
	bool tag;
	if (str1.size() != str2.size()) {
		tag = false;
	}
	else if (str.find(str2) != str.npos) {
		tag = true;
	}
	else {
		tag = false;
	}

	if (tag == true)
		return "yes";
	else
		return "no";
}