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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. class M{
  5.   static String c(int i){
  6.     if(i <= 0){
  7.       return "";
  8.     }
  9.     ArrayList<Long> r = f(1),
  10.                     s = f(3),
  11.                     t = f(9),
  12.                     x = f(i);
  13.     String z = "first meets river ",
  14.            y = " at ";
  15.     for(int j = 0; j < r.size(); j++){
  16.       long u = r.get(j),
  17.            v = s.get(j),
  18.            w = t.get(j);
  19.       if(x.contains(u)){
  20.         return z+1+y+u;
  21.       }
  22.       if(x.contains(v)){
  23.         return z+3+y+v;
  24.       }
  25.       if(x.contains(w)){
  26.         return z+9+y+w;
  27.       }
  28.     }
  29.     return "";
  30.   }
  31.  
  32.   static ArrayList f(long i){
  33.     ArrayList<Long> l = new ArrayList();
  34.     l.add(i);
  35.     for(long j = 0, x; j < 9e4; j++){
  36.       x = l.get(l.size() - 1);
  37.       for(char c : (x + "").toCharArray()){
  38.         x += Character.getNumericValue(c);
  39.       }
  40.       l.add(x);
  41.       if(x > 16383){
  42.         return l;
  43.       }
  44.     }
  45.     return l;
  46.   }
  47.  
  48.   public static void main(String[] a){
  49.     System.out.println(c(86));
  50.     System.out.println(c(12345));
  51.     System.out.println(c(0));
  52.   }
  53. }
Success #stdin #stdout 0.15s 320576KB
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first meets river 1 at 101
first meets river 3 at 12423
https://ideone.com/8Mpfsw
language:
Java (12.0.1)
created:
7 years ago
visibility:
public

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