Hdu1018 大数 java版

直接上代码

import java.math.BigInteger;  import java.util.Scanner;  public class Main {      public static void main(String []args)throws Exception{          Scanner cin = new Scanner(System.in);          int t = cin.nextInt();          while(t--!=0){          String a=cin.next();          int n = Integer.parseInt(a);          System.out.println(digit(n));          }          cin.close();      }      public static int digit(int n){          double sum=0;          for(int i=1;i<=n;i++)          {              double t = Math.log10(i);              sum+=t;          }          return (int)sum+1;      }  }