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  1. import java.util.*;
  2.  
  3. class Main{
  4.  
  5.     public static void main(String[] args){
  6.  
  7. 	Scanner sc = new Scanner(System.in);
  8.  
  9. 	int N = sc.nextInt();
  10.  
  11. 	int power = 0;
  12.  
  13. 	while(N>=10){
  14.  
  15. 	power++;
  16.  
  17. 	N /= 10;
  18.  
  19.  }	
  20.  
  21. 	int ans = 0;
  22.  
  23. 	for(int i=1; i<=power; i++){
  24.  
  25. 	if(i%2 == 1){
  26.  
  27. 	ans += 9*Math.pow(10,i-1);
  28.  
  29.    }
  30.   }
  31.  
  32. 	if(power%2 == 1){
  33.  
  34. 	System.out.println(ans);
  35.  
  36. }
  37.  
  38. 	else{
  39.  
  40. 	System.out.println(ans+(N+1-1*Math.pow(N,power)));
  41.  
  42. }	
  43.  
  44.  
  45.  }
  46. }
Success #stdin #stdout 0.1s 35616KB
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https://ideone.com/qlImX9
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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