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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.  
  11.     public static void main (String[] args) throws java.lang.Exception
  12.     {
  13.         int rtn = openedRoomNo(5);
  14.         System.out.println("return value is : " + rtn);
  15.     }
  16.  
  17.  
  18.     static int openedRoomNo(int rooms) {
  19.         int rtnVal = 0;
  20.         //set default arr
  21.         int[][] roomsArr = new int[rooms][2];
  22.         int cnt = 0;
  23.         for(int[] room : roomsArr) {
  24.             room[0] = ++cnt;
  25.             room[1] = 1;
  26.         }
  27.         rtnVal = loopAtAddedCount(2, roomsArr);
  28.         return rtnVal;
  29.     }
  30.  
  31.     static int loopAtAddedCount (int divNo, int[][] rooms) {
  32.         int loopCnt = 0;
  33.  
  34.         if(divNo == rooms.length) {
  35.             for(int[] room : rooms) {
  36.                 if(room[1] == 1) {
  37.                     System.out.println("room[1] is " +room[1]);
  38.                     loopCnt ++;
  39.                 }
  40.             }
  41.             return loopCnt;
  42.         }
  43.  
  44.  
  45.         for(int [] room : rooms) {
  46.            if(divNo % room[0]  == 0) {
  47.                if(room[1] == 0) {
  48.                    room[1] = 1;
  49.                }else {
  50.                    room[1] = 0;
  51.                }
  52.            }
  53.         }
  54.         divNo +=1;
  55.         return loopAtAddedCount(divNo , rooms);
  56.     }
  57. }
Success #stdin #stdout 0.1s 33940KB
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stdin
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Standard input is empty
stdout
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room[1] is 1
room[1] is 1
return value is : 2
https://ideone.com/jyBTgp
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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