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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.     }
  32.  
  33.     static int loopAtAddedCount (int divNo, int[][] rooms) {
  34.         int loopCnt = 0;
  35.  
  36.         if(divNo > rooms.length) {
  37.             for(int[] room : rooms) {
  38.                 if(room[1] == 1) {
  39.                     System.out.println("after room[0] is " +room[0]);
  40.                     loopCnt ++;
  41.                 }
  42.             }
  43.             return loopCnt;
  44.         }
  45.  
  46.         for(int [] room : rooms) {
  47.             for(int i = 1 ; divNo * i <= rooms.length ; i++) {
  48.                 if(room[0] % (divNo * i)    == 0) {
  49.                     System.out.println("divNo is " +divNo +  "changed room no " +room[0]);
  50.                     if(room[1] == 0) {
  51.                         room[1] = 1;
  52.                     }else {
  53.                         room[1] = 0;
  54.                     }
  55.                 }
  56.             }
  57.         }
  58.         divNo +=1;
  59.         return loopAtAddedCount(divNo , rooms);
  60.     }
  61. }
Success #stdin #stdout 0.11s 36296KB
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stdin
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Standard input is empty
stdout
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divNo is 2changed room no 2
divNo is 2changed room no 4
divNo is 2changed room no 4
divNo is 3changed room no 3
divNo is 4changed room no 4
divNo is 5changed room no 5
after room[0] is 1
return value is : 1
https://ideone.com/6nhCKV
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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