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为什么用JAVA高精都过不了???不是说至少精确十二位就行了么~~~import java.math.*; import java.io.*; import java.util.*; public class Main { public static void main(String[] args) throws IOException { Scanner cin=new Scanner(System.in); int i,j,n; BigInteger num[][]=new BigInteger[105][105],ans; for(i=0;i<=100;i++) for(j=0;j<=100;j++) num[i][j]=BigInteger.ZERO; num[1][1]=BigInteger.ONE; for(i=2;i<=100;i++) for(j=1;j<=i;j++) { num[i][j]=BigInteger.valueOf(j).multiply(num[i-1][j]); num[i][j]=num[i][j].add(num[i-1][j-1]); } while(cin.hasNext()) { ans=BigInteger.ZERO; n=cin.nextInt(); if(n==0) break; for(i=1;i<=n;i++) ans=ans.add(num[n][i]); System.out.println(ans); } } } Followed by:
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