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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.     private char[][] pixels;
  12.  
  13.     public Ideone(char[][] pixels) {
  14.         this.pixels = pixels;
  15.     }
  16.  
  17.     public void fill(int x, int y, char newColor, char oldColor) {
  18.         if (x < 0) return;
  19.         if (y < 0) return;
  20.         if (x >= pixels.length) return;
  21.         if (y >= pixels[x].length) return;
  22.  
  23.         if (oldColor != pixels[x][y]) return;
  24.  
  25.         pixels[x][y] = newColor;
  26.  
  27.         fill(x - 1, y, newColor, oldColor);
  28.         fill(x + 1, y, newColor, oldColor);
  29.         fill(x, y - 1, newColor, oldColor);
  30.         fill(x, y + 1, newColor, oldColor);
  31.     }
  32.  
  33.     public void inspect() {
  34.         for (int y = 0; y < pixels.length; y++) {
  35.             for (int x = 0; x < pixels[y].length; x++) {
  36.                 System.out.print(pixels[y][x]);
  37.             }
  38.             System.out.print("\n");
  39.         }
  40.     }
  41.  
  42.     public static void main(String argv[]) {
  43.         char pixels[][] =
  44.         {
  45.             { 'O', 'X', 'X', 'X', 'X' },
  46.             { 'X', 'O', 'O', 'O', 'X' },
  47.             { 'X', 'O', '#', 'O', 'X' },
  48.             { 'X', 'O', 'O', 'O', 'X' },
  49.             { 'X', 'X', 'X', 'X', 'X' },
  50.             { 'X', 'X', 'X', '#', '#' },
  51.             { 'X', 'X', 'X', 'X', 'X' }
  52.         };
  53.         Ideone bucketFill = new Ideone(pixels);
  54.         bucketFill.fill(0, 0, '*', 'O');
  55.         bucketFill.fill(3, 0, 'O', 'O');
  56.         bucketFill.fill(2, 1, '@', 'O');
  57.         bucketFill.inspect();
  58.     }
  59. }
Success #stdin #stdout 0.07s 381248KB
comments (?)
stdin 
Standard input is empty
stdout 
*XXXX
X@@@X
X@#@X
X@@@X
XXXXX
XXX##
XXXXX
https://ideone.com/3S0LEp
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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