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View Compilation Error

0_0_26407806_13730\Main.java:2: 错误: 找不到符号
	public static BigInteger getTac(BigInteger a) {
	                                ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_26407806_13730\Main.java:2: 错误: 找不到符号
	public static BigInteger getTac(BigInteger a) {
	              ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_26407806_13730\Main.java:3: 错误: 找不到符号
		if(a.compareTo(new BigInteger("1"))<=0) return new BigInteger("1");
		                   ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_26407806_13730\Main.java:3: 错误: 找不到符号
		if(a.compareTo(new BigInteger("1"))<=0) return new BigInteger("1");
		                                                   ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_26407806_13730\Main.java:4: 错误: 找不到符号
		else return a.multiply(getTac(a.subtract(new BigInteger("1"))));
		                                             ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_26407806_13730\Main.java:7: 错误: 找不到符号
		Scanner cin=new Scanner(System.in);
		^
  符号:   类 Scanner
  位置: 类 Main
0_0_26407806_13730\Main.java:7: 错误: 找不到符号
		Scanner cin=new Scanner(System.in);
		                ^
  符号:   类 Scanner
  位置: 类 Main
0_0_26407806_13730\Main.java:9: 错误: 找不到符号
			BigInteger n=cin.nextBigInteger();
			^
  符号:   类 BigInteger
  位置: 类 Main
8 个错误


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