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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String x = "RGBY";
		String y = "GGRR"
 
 
		System.out.println(calculateScore(x, y));
	}
 
	public Score calculateScore(String board, String guess){
		//if board and guess are different lengths, or length 0, return null
 
		Set<Integer> hitIndices = new Set<Integer>();
		String availablePseds = “”;
		int pseds;
		//calculate hits and available pseudohit letters
		for (int i = 0; i < board.length(); i++){
			if (board.charAt(i) == guess.charAt(i)){
				hitIndices.add(i);
			} else {
				availablePseds += board.charAt(i);
			}
		}
		//calculate pseudoHits
		for (int i = 0; i < guess.length(); i++){
			if (!hitIndices.contains(i)){
				if (availablePseds.contains(guess.charAt(i))){
					pseds++;
					availablePseds.replace(guess.charAt(i), “”);
				}
			}
		}
		return new Score(hitIndices.size(), pseds);
	}
 
 
	public class Score {
		private short hits;
		private short pseudoHits;
 
		public Score(int h, int p){
			hits = h;
			pseudoHits = p;
		}
 
		public String toString(){
			return “hits: “ + hits + “; pseds: “ + pseudoHits;
		}
	}
 
}

Main.java:13: error: ';' expected
		String y = "GGRR"
		                 ^
Main.java:23: error: illegal character: '\u201c'
		String availablePseds = ??;
		                        ^
Main.java:23: error: illegal character: '\u201d'
		String availablePseds = ??;
		                         ^
Main.java:38: error: illegal character: '\u201c'
					availablePseds.replace(guess.charAt(i), ??);
					                                        ^
Main.java:38: error: illegal character: '\u201d'
					availablePseds.replace(guess.charAt(i), ??);
					                                         ^
Main.java:38: error: illegal start of expression
					availablePseds.replace(guess.charAt(i), ??);
					                                          ^
Main.java:56: error: illegal character: '\u201c'
			return ?hits: ? + hits + ?; pseds: ? + pseudoHits;
			       ^
Main.java:56: error: illegal character: '\u201c'
			return ?hits: ? + hits + ?; pseds: ? + pseudoHits;
			              ^
Main.java:56: error: illegal character: '\u201c'
			return ?hits: ? + hits + ?; pseds: ? + pseudoHits;
			                         ^
Main.java:56: error: not a statement
			return ?hits: ? + hits + ?; pseds: ? + pseudoHits;
			                       ^
Main.java:56: error: illegal character: '\u201c'
			return ?hits: ? + hits + ?; pseds: ? + pseudoHits;
			                                   ^
Main.java:56: error: not a statement
			return ?hits: ? + hits + ?; pseds: ? + pseudoHits;
			                                     ^
12 errors

Standard output is empty