欧拉工程第54题：Poker hands

package projecteuler51to60;

import java.awt.peer.SystemTrayPeer;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.TreeSet;

class Card{
    //一张一张的读取,一张牌，以及对于的颜色
    public final int rank;
    public final int suit;
    public Card(int rank,int suit){
        if(rank<0 || rank>= 13 ||suit< 0||suit>= 4)
            throw new IllegalAccessError();
        this.rank= rank;
        this.suit= suit;
    }
    public Card(String str){
        this("23456789TJQKA".indexOf(str.charAt(0)), "SHCD".indexOf(str.charAt(1)));
    }

    public boolean equals(Object obj) {
        if (!(obj instanceof Card))
            return false;
        Card other = (Card)obj;
        return rank == other.rank && suit == other.suit;
    }

    public int hashCode() {
        return rank * 4 + suit;
    }

}

class p54{
    void solve0(){
        String filenameString="src//projecteuler51to60//p054_poker.txt";
        readTxtFile(filenameString);
    }
    int Judge(String[] twoManCard){
        Card[] player1 = new Card[5];
        Card[] player2 = new Card[5];

        for(int i=0;i<5;i++){
            player1[i] = new Card(twoManCard[i+0]);
            player2[i] = new Card(twoManCard[i+5]);
        }
        if (getScore(player1) > getScore(player2))
            return 1;
        return 0;
    }
    int getScore(Card[] hand){
        if(hand.length !=5)
            throw new IllegalArgumentException();
        int[] rankCounts = new int[13];
        int flushSuit = hand[0].suit;
        //长度是13的数组，数组值是：各位置数出现的次数
        //flushSuit 判断颜色是否一样
        for(Card card:hand){
            rankCounts[card.rank]++;
            if(card.suit!=flushSuit)
                flushSuit = -1;
        }
        //rankCountHist 统计rankCounts中出现了多少次 0 1 2 3 4 5，rankCounts中所有数之和是5，应该就五张牌
        int[] rankCountHist = new int[6];
        for(int i=0;i<rankCounts.length;i++)
            rankCountHist[rankCounts[i]]++;
        int bestCards = get5FrequnetHighestCards(rankCounts, rankCountHist);
        int straightHishRank = getStraighHighRank(rankCounts);
        if(flushSuit!=-1)System.out.println("ok");
        // Straight flush
        if(straightHishRank!=-1 && flushSuit!=-1)          return 8<<20|straightHishRank;
        // Four of a kind
        else if(rankCountHist[4]==1)                     return 7<<20|bestCards;
        // Full house
        else if(rankCountHist[3]==1&&rankCountHist[2]==1)return 6<<20|bestCards;
        // Flush
        else if(flushSuit!=-1)                             return 5<<20|bestCards;
         // Straight
        else if(straightHishRank!=-1)                     return 4<<20|straightHishRank;
         // Three of a kind
        else if(rankCountHist[3]==1)                     return 3<<20|bestCards;
         // Two pairs
        else if(rankCountHist[2]==2)                     return 2<<20|bestCards;
        // One pair
        else if(rankCountHist[2]==1)                     return 1<<20|bestCards;
        // High card
        else                                              return 0<<20|bestCards;
    }
    int get5FrequnetHighestCards(int[] ranks,int[] ranksHist)  {
        int result = 0;
        int count =0;
        for(int i=ranksHist.length-1;i>=0;i--){
            for(int j=ranks.length-1;j>=0;j--){
                if(ranks[j]==i){
                    for(int k=0;k<i&&count<5;k++,count++)
                        result=result<<4|j;
                }
            }
        }

        return result;
    }
    int getStraighHighRank(int[] ranks){
        outer:
        for(int i=ranks.length -1;i>=3;i--){
            for(int j=0;j<5;j++){
                if(ranks[(i-j+13)%13] ==0)
                    continue outer;
            }
            return i;
        }
    return -1;
    }

    void readTxtFile(String filename){
        File fl =new File(filename);
        int res=0;
        FileReader reader=null;
        try {
            reader = new FileReader(fl);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        BufferedReader br = new BufferedReader(reader);
        String line="";
        try {
            while((line=br.readLine())!=null){
                String[] twoManCard = line.split(" ");
                res+=Judge(twoManCard);

            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            System.out.println("no file");
        }
    System.out.println(res);
    }

}
public class Problem54 {

    public static void main(String[] args){
        long begin= System.currentTimeMillis();
        new p54().solve0();
        long end = System.currentTimeMillis();
        long Time = end - begin;
        System.out.println("Time:"+Time/1000+"s"+Time%1000+"ms");
    }

}