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View Compilation Error

0_0_26291453_12613\Main.java:1: 错误: 类allright是公共的, 应在名为 allright.java 的文件中声明
public class allright {
       ^
0_0_26291453_12613\Main.java:4: 错误: 找不到符号
        Scanner cin=new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 allright
0_0_26291453_12613\Main.java:4: 错误: 找不到符号
        Scanner cin=new Scanner(System.in);
                        ^
  符号:   类 Scanner
  位置: 类 allright
0_0_26291453_12613\Main.java:5: 错误: 找不到符号
        BigInteger[] a=new BigInteger[1004];
        ^
  符号:   类 BigInteger
  位置: 类 allright
0_0_26291453_12613\Main.java:5: 错误: 找不到符号
        BigInteger[] a=new BigInteger[1004];
                           ^
  符号:   类 BigInteger
  位置: 类 allright
0_0_26291453_12613\Main.java:6: 错误: 找不到符号
        a[0]=new BigInteger("1");
                 ^
  符号:   类 BigInteger
  位置: 类 allright
0_0_26291453_12613\Main.java:11: 错误: 找不到符号
        	a[i]=a[i-1].multiply(new BigInteger ("2"));
        	                         ^
  符号:   类 BigInteger
  位置: 类 allright
7 个错误


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