HackerRank BattleShip Code Solution

Hackerrank Artificial Intelligence Hackerrank Online Judge Solution

HackerRank BattleShip Code Solution

HackerRank BattleShip Code Solution

Problem Name – BattleShip
Problem Link –  BattleShip
Level – Artificial Intelligence

Java Code

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

public class Battleship {
public static void main(String[] args) {
Scanner scn = new Scanner(System.in);
String out = scn.nextLine();

if (out.equals("INIT")) {
System.out.println("3 0");
System.out.println("9 9");
System.out.println("6 4:6 5");
System.out.println("3 7:4 7");
System.out.println("7 7:7 9");
System.out.println("1 5:1 8");
System.out.println("3 2:7 2");
} else {
String[] board = new String[10];
@SuppressWarnings("unused")
boolean printed = false;

for (int i = 0; i < 10; i++) {
board[i] = scn.nextLine();
}

File fileName = new File("myfile.txt");

if (!fileName.exists()) {
try {
fileName.createNewFile();
FileWriter fileWrite = new FileWriter(fileName);
BufferedWriter bufferedWriter = new BufferedWriter(
fileWrite);
ArrayList<Integer> moves = getRandom(board);
int x = moves.get(0);
int y = moves.get(1);
bufferedWriter.write(x + " " + y);
bufferedWriter.close();
System.out.println(x + " " + y);
} catch (IOException e) {
}
} else {
try {
byte[] buffer = new byte[100];
FileInputStream inputStream = new FileInputStream(fileName);
@SuppressWarnings("unused")
int readLines = -1;
String last_move = "";

while ((readLines = inputStream.read(buffer)) != -1) {
last_move = new String(buffer);
}

inputStream.close();
int x = Character.getNumericValue(last_move.charAt(0));
int y = Character.getNumericValue(last_move.charAt(2));

if (board[x].charAt(y) == 'h') {
if (x + 1 < 10 && board[x + 1].charAt(y) == 'h') {
for (int i = 1; i < 9 - x; i++) {
if (x - i >= 0 && board[x - i].charAt(y) == '-') {
x -= i;
break;
} else if (x - i >= 0
&& board[x - i].charAt(y) == 'm') {
break;
}
}

for (int i = 1; i < 9 - x; i++) {
if (x + i < 10 && board[x + i].charAt(y) == '-') {
x += i;
break;
} else if (x + i < 10
&& board[x + i].charAt(y) == 'm') {
break;
}
}
} else if (x - 1 >= 0 && board[x - 1].charAt(y) == 'h') {
for (int i = 1; i < 9 - x; i++) {
if (x - i >= 0 && board[x - i].charAt(y) == '-') {
x -= i;
break;
} else if (x - i >= 0
&& board[x - i].charAt(y) == 'm') {
break;
}
}

for (int i = 1; i < 9 - x; i++) {
if (x + i < 10 && board[x + i].charAt(y) == '-') {
x += i;
break;
} else if (x + i < 10
&& board[x + i].charAt(y) == 'm') {
break;
}
}
} else if (y + 1 < 10 && board[x].charAt(y + 1) == 'h') {
for (int i = 1; i < 9 - y; i++) {
if (y - i >= 0 && board[x].charAt(y - i) == '-') {
y -= i;
break;
} else if (y - i >= 0
&& board[x].charAt(y - i) == 'm') {
break;
}
}

for (int i = 1; i < 9 - y; i++) {
if (y + i < 10 && board[x].charAt(y + i) == '-') {
y += i;
break;
} else if (y + i < 10
&& board[x].charAt(y + i) == 'm') {
break;
}
}
} else if (y - 1 >= 0 && board[x].charAt(y - 1) == 'h') {
for (int i = 1; i < 9 - y; i++) {
if (y - i >= 0 && board[x].charAt(y - i) == '-') {
y -= i;
break;
} else if (y - i >= 0
&& board[x].charAt(y - i) == 'm') {
break;
}
}

for (int i = 1; i < 9 - y; i++) {
if (y + i < 10 && board[x].charAt(y + i) == '-') {
y += i;
break;
} else if (y + i < 10
&& board[x].charAt(y + i) == 'm') {
break;
}
}
} else {
ArrayList<Integer> moves = getRemainingHit(board);
x = moves.get(0);
y = moves.get(1);
}
} else {
ArrayList<Integer> moves = getRemainingHit(board);
x = moves.get(0);
y = moves.get(1);
}

while (board[x].charAt(y) != '-') {
ArrayList<Integer> moves = getRandom(board);
x = moves.get(0);
y = moves.get(1);
}

fileName.createNewFile();
FileWriter fileWrite = new FileWriter(fileName);
BufferedWriter bufferedWriter = new BufferedWriter(
fileWrite);
bufferedWriter.write(x + " " + y);
bufferedWriter.close();
System.out.println(x + " " + y);
} catch (IOException e) {
}
}
}
}

private static ArrayList<Integer> getRemainingHit(String[] board) {
ArrayList<Integer> to_return = new ArrayList<Integer>();
boolean added = false;

for (int x = 0; x < 10; x++) {
for (int y = 0; y < 10; y++) {
if (board[x].charAt(y) == 'h') {
if (x - 1 >= 0 && board[x - 1].charAt(y) == '-') {
to_return.add(x - 1);
to_return.add(y);
added = true;
} else if (x + 1 < 10 && board[x + 1].charAt(y) == '-') {
to_return.add(x + 1);
to_return.add(y);
added = true;
} else if (y - 1 >= 0 && board[x].charAt(y - 1) == '-') {
to_return.add(x);
to_return.add(y - 1);
added = true;
} else if (y + 1 < 10 && board[x].charAt(y + 1) == '-') {
to_return.add(x);
to_return.add(y + 1);
added = true;
}
}

if (added) {
return to_return;
}
}
}

return getRandom(board);
}

private static ArrayList<Integer> getRandom(String[] board) {
ArrayList<Integer> to_return = new ArrayList<Integer>();
Random ran = new Random();
int x = 0;
int y = 0;

do {
x = ran.nextInt(10);
y = ran.nextInt(10);
} while (board[x].charAt(y) != '-');

to_return.add(x);
to_return.add(y);

return to_return;
}
}

Output: 

Tags: HackerRank Online Judge Solution, HackerRank OJ Solution list, HackerRank Problems Solution, HackerRank solver, HackerRank all problem solution list, HackerRank solution in java, Hackerrank Java Solution, Hackerrank Online Judge Solution, Hackerrank Artificial Intelligence

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