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  1. import java.util.*;
  2.  
  3. public class Main {
  4.     public static void main(String[] strg) {
  5.         int[][] arr = {{1, 1, 1, 1}, {4, 4, 4, 4}, {3, 3, 1, 1}};
  6.         numOfColors(arr);
  7.     }
  8.     static int numOfColors(int[][] map) {
  9.         ArrayList<Integer> intlist = new ArrayList<Integer>();
  10.         for (int o = 0; o < map.length; o++) {
  11.             for (int n = 0; n < map[o].length; n++) {
  12.                 intlist.add(map[o][n]);
  13.             }
  14.         }
  15.         intlist = removeDuplicates(intlist, 0);
  16.         System.out.println(intlist.size()+" " +intlist);
  17.         return intlist.size();
  18.     }
  19.     static ArrayList<Integer> removeDuplicates(ArrayList<Integer> list, int counter) {
  20.         if (list == null) {
  21.             throw new NullPointerException();
  22.         }
  23.         if (counter < list.size()) {
  24.             if (list.contains(list.get(counter))) {
  25.                 if (list.lastIndexOf(list.get(counter)) != counter) {
  26.                     list.remove(list.lastIndexOf(list.get(counter)));
  27.                     counter--;
  28.                 }
  29.             }
  30.             removeDuplicates(list, ++counter);
  31.         }
  32.         return list;
  33.     }
  34. }
  35.  
  36.  
Success #stdin #stdout 0.05s 711168KB
comments (?)
stdin 
Standard input is empty
stdout 
3 [1, 4, 3]
https://ideone.com/eUZDV0
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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