Hdu1018 大數 java版

每日一看

直接上代碼

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;  
    }  
}