View Compilation Error

0_0_35780181_14059\Main.java:3: 错误: 找不到符号
        Scanner in = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 Solution
0_0_35780181_14059\Main.java:3: 错误: 找不到符号
        Scanner in = new Scanner(System.in);
                         ^
  符号:   类 Scanner
  位置: 类 Solution
0_0_35780181_14059\Main.java:6: 错误: 无法从静态上下文中引用非静态 方法 longestCommonSubsequence(String,String)
        int res = longestCommonSubsequence(text1, text2);
                  ^
3 个错误