最大公约串

public static void GetMax(string s1, string s2) { char[] c1 = s1.ToCharArray(); char[] c2 = s2.ToCharArray(); int b = 0, e = 0; bool flag = false; for (int i = 0; i < s1.Length; i++) {int temp = i;int bt = 0;int et = 0;for (int h = 0; h < s2.Length; h++){if (c1[temp] == c2[h]){if (flag){et = h; //标记结束}else{bt = h; //标记开始flag = true;}if (temp < s1.Length - 1){temp++;}else{flag = false;if (et - bt > e - b){e = et;b = bt;}break;}}else{flag = false;if (et - bt > e - b){e = et;b = bt;}temp = i;}}}Console.WriteLine(s2.Substring(b, e - b + 1));}