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https://www.acmicpc.net/problem/1748
1748번: 수 이어 쓰기 1
첫째 줄에 N(1 ≤ N ≤ 100,000,000)이 주어진다.
www.acmicpc.net
// 코드
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import java.util.*;import java.io.*;
interface Main{public static void main(String[] a)throws Exception{
// Please Enter Your Code Here
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(System.out));BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String strNum=br.readLine();int parseNum=Integer.parseInt(strNum),len=strNum.length(),lenCpy=len,myNum=(int)Math.pow(10,lenCpy-1),mySum=0;
do{mySum+=(lenCpy==len?(((parseNum-myNum)+1)*len--):((myNum*9)*len--));}while((myNum/=10)>0);
bw.write(String.valueOf( (lenCpy == 1) ? parseNum : mySum ));
bw.flush();bw.close();br.close();
}}
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