/gist:476dd5883edfc589455a Secret
Created
February 5, 2015 16:03
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package challenge200; | |
import java.io.BufferedReader; | |
import java.io.FileReader; | |
import java.io.IOException; | |
import java.util.ArrayList; | |
import java.util.Arrays; | |
import java.util.List; | |
import java.util.Scanner; | |
/** | |
* Created by jon on 2/3/15. | |
*/ | |
public class Solution { | |
public static List<String> borderCharacters = new ArrayList<>(); | |
public static String targetCharacter = ""; | |
public static void main(String[] args) { | |
Scanner scanner = new Scanner(System.in); | |
System.out.print("Please enter border characters separated by spaces:"); | |
borderCharacters = Arrays.asList(scanner.nextLine().split(" ")); | |
System.out.print("Please enter a target character:"); | |
targetCharacter = scanner.nextLine(); | |
System.out.print("Please enter the filename: "); | |
String inputFileName = scanner.nextLine(); | |
try { | |
BufferedReader bufferedReader = new BufferedReader(new FileReader("input-files/challenge200/" + inputFileName)); | |
List<String[]> grid = buildGrid(bufferedReader); | |
List<String> floodFillStartingInfo = Arrays.asList(bufferedReader.readLine().split(" ")); | |
floodFillGrid(grid, Integer.parseInt(floodFillStartingInfo.get(1)), Integer.parseInt(floodFillStartingInfo.get(0)), floodFillStartingInfo.get(2)); | |
grid.forEach((String[] row) -> System.out.println(Arrays.deepToString(row))); | |
} catch (Exception exception) { | |
System.out.println(exception.getCause().toString()); | |
} | |
} | |
private static void floodFillGrid(List<String[]> grid, Integer yCoordinate, Integer xCoordinate, String newCharacter) { | |
if (xCoordinate < 0 || yCoordinate < 0 || yCoordinate >= grid.size() || xCoordinate >= grid.get(yCoordinate).length) { | |
return; | |
} else { | |
String currentCharacter = grid.get(yCoordinate)[xCoordinate]; | |
if (borderCharacters.contains(currentCharacter) || currentCharacter.equals(newCharacter)) { | |
return; | |
} else { | |
if (currentCharacter.equals(targetCharacter)) { | |
grid.get(yCoordinate)[xCoordinate] = newCharacter; | |
} | |
floodFillGrid(grid, yCoordinate + 1, xCoordinate, newCharacter); | |
floodFillGrid(grid, yCoordinate - 1, xCoordinate, newCharacter); | |
floodFillGrid(grid, yCoordinate, xCoordinate + 1, newCharacter); | |
floodFillGrid(grid, yCoordinate, xCoordinate - 1, newCharacter); | |
} | |
} | |
} | |
private static List<String[]> buildGrid(BufferedReader bufferedReader) throws IOException { | |
String[] dimensions = bufferedReader.readLine().split(" "); | |
String[][] grid = new String[Integer.parseInt(dimensions[1])][Integer.parseInt(dimensions[0])]; | |
for (int current = 0; current < grid.length; current++) { | |
grid[current] = bufferedReader.readLine().split(""); | |
} | |
return Arrays.asList(grid); | |
} | |
} |
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