第1回オフラインリアルタイムどう書く(Java)

Main.java

import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Main {
        private static int[] table = new int[(int)Math.pow(3, 9)];
    private static int convertBoardToInt(char[] inp) {
        int sum = 0;
        int[] board = new int[9];
        for (int i = 0; i < 9; i++) {
            if(hasWon(sum) != 0) return sum;
            int p = i % 2 + 1;
            int d = inp[i] - '0' - 1;
            if (board[d] != 0) return -p;
            else               board[d] = p;
            sum += p * (int)Math.pow(3, d);
        }
        return sum;
    }
    private static int[] hashToIntArray(int h) {
        int[] a = new int[9];
        for(int i = 0; i < 9; i++) {
            a[i] = h % 3;
            h /= 3;
        }
        return a;
    }
    private static void setResults() {
            int size = table.length;
        for(int h = 0; h < size; h++) {
            int[] a = hashToIntArray(h);
            if      (a[0] != 0    &&
                                 a[0] == a[1] && 
                                 a[0] == a[2]) table[h] = a[0];
            else if (a[3] != 0 &&
                 a[3] == a[4] &&
                                 a[3] == a[5]) table[h] = a[3];
            else if (a[6] != 0 &&
                 a[6] == a[7] &&
                                 a[6] == a[8]) table[h] = a[6];
            else if (a[0] != 0 &&
                 a[0] == a[3] &&
                                 a[0] == a[6]) table[h] = a[0];
            else if (a[1] != 0 &&
                 a[1] == a[4] &&
                                 a[1] == a[7]) table[h] = a[1];
            else if (a[2] != 0 &&
                 a[2] == a[5] &&
                                 a[2] == a[8]) table[h] = a[2];
            else if (a[0] != 0 &&
                 a[0] == a[4] &&
                                 a[0] == a[8]) table[h] = a[0];
            else if (a[2] != 0 &&
                 a[2] == a[4] &&
                                 a[2] == a[6]) table[h] = a[2];
        }  
        }
    private static int hasWon(int h) {
        return table[h];
        } 
    public static void main(String[] args) throws Exception {
        setResults();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = null;
        while((line = br.readLine()) != null) {
            String[] ss = line.split("\\t");
            int v = convertBoardToInt(ss[1].toCharArray());
            String result = null;
            if(v < 0) {
                result = String.format("Foul : %s won.", (-v == 1)? "x": "o");
            } else {
                switch(hasWon(v)) {
                case 0: result = "Draw game."; break;
                case 1: result = "o won."; break;
                case 2: result = "x won."; break;
                }
            }
            if(!result.equals(ss[2])) {
                System.out.println("input:" + ss[1]);
                System.out.println("expected:" + ss[2]);
                System.out.println("actual:" + result);
            }
        }
    }

}