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View Compilation Error

0_0_4050722_20023\Main.java:3: 找不到符号
符号: 类 Scanner
位置: 类 Main
		Scanner cin=new Scanner(System.in);
		^
0_0_4050722_20023\Main.java:3: 找不到符号
符号: 类 Scanner
位置: 类 Main
		Scanner cin=new Scanner(System.in);
		                ^
0_0_4050722_20023\Main.java:5: 找不到符号
符号: 类 BigInteger
位置: 类 Main
		BigInteger tmp,sum;
		^
0_0_4050722_20023\Main.java:8: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
			sum=BigInteger.ZERO;
			    ^
4 错误


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