### Monopoly odds题号：84 难度： 35 中英对照

In the game, Monopoly, the standard board is set up in the following way:

 GO A1 CC1 A2 T1 R1 B1 CH1 B2 B3 JAIL H2 C1 T2 U1 H1 C2 CH3 C3 R4 R2 G3 D1 CC3 CC2 G2 D2 G1 D3 G2J F3 U2 F2 F1 R3 E3 E2 CH2 E1 FP

### Code

import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;

public final class p84 {
public static void main(String[] args) {
long start=System.nanoTime();
String result = run();
long end=System.nanoTime();
System.out.println(result);
System.out.println( (end-start)/1000000 + "ms" );
}
static public class Pair implements Comparable<Pair>{
public int p;
public int pos;
public Pair(int p,int pos){this.p=p;this.pos=pos;}
public int compareTo(Pair o) {
int ans=Integer.compare(p, o.p);
if(ans==0) return Integer.compare(pos, o.pos);
return ans;
}
}
static public String run(){
p84 sol=new p84();
//模拟一百万万步
int itterations = 1000000;
for(int i = 0; i < itterations; i++)
sol.Roll();
//打印百分比在3%以上的情况
ArrayList<Pair> ans=new ArrayList<Pair>();
for(int i = 0; i < sol.board.length; i++)
Collections.sort(ans);
String res="";
for(int i=ans.size()-1,j=0;i>=0&&j<3;i--,j++)
res+=ans.get(i).pos;
return res;
}

int[] board = new int[40];
int currentSquare = 0;
int totalRolls = 0;
int CHcard = 0;
int CCcard = 0;
Random generator = new Random();

//特殊的位置
int cc1 = 2;
int cc2 = 17;
int cc3 = 33;
int jail = 10;
int go2jail = 30;
int ch1 = 7;
int ch2 = 22;
int ch3 = 36;
int go = 0;

//记录当前和前2次的投骰子的情况
int[] prevPrevRoll = new int[2];
int[] prevRoll = new int[2];
int[] currRoll = new int[2];
int numberOfTriples = 0;

public p84(){
//    System.out.println("开始模拟大富翁:");
for(int i = 0; i < board.length; i++){
board[i] = 0;
}
prevRoll[1] = 30;//保证你不能立刻进监狱，G2J:30
}

public int Roll(){
//两个骰子，4个面
int die1 = generator.nextInt(4) + 1;
int die2 = generator.nextInt(4) + 1;

//记录当前和前2次的投骰子的情况
prevPrevRoll[0] = prevRoll[0];
prevPrevRoll[1] = prevRoll[1];
prevRoll[0] = currRoll[0];
prevRoll[1] = currRoll[1];
currRoll[0] = die1;
currRoll[1] = die2;
int total = die1 + die2;
totalRolls++;

int possibleMove = (currentSquare + total)%40;

if(tooManyDoubles(currRoll, prevRoll, prevPrevRoll))
{
//投到相同的就重新设置上一次投的情况
currRoll[1] = -1;
numberOfTriples++;
currentSquare = jail;
board[currentSquare]++;
return currentSquare;
}
//机会卡
else if(possibleMove == 7 || possibleMove == 22 || possibleMove == 36 ){

currentSquare = Chance(possibleMove);
board[currentSquare]++;
return currentSquare;
}
//宝箱卡
else if(possibleMove == cc1 || possibleMove == cc2 || possibleMove == cc3){

currentSquare = ComChest(possibleMove);
board[currentSquare]++;
return currentSquare;
}
//进监狱
else if(possibleMove == go2jail){

currentSquare = jail;
board[currentSquare]++;
return currentSquare;
}
//什么都没有发生，继续移动
else
{
currentSquare = (currentSquare + total)%40;
board[currentSquare]++;
return currentSquare;
}
}

//连续三次投骰子都投到3次
public boolean tooManyDoubles(int[] a, int[] b, int[] c){
if(a[0] == a[1]){
if(b[0] == b[1]){
if(c[0] == c[1]){
return true;
}
}
}
return false;
}
/*
* 宝箱卡 (2/16 张卡):
回到起点“GO”
进入监狱“JAIL”
*/
//抽宝箱里的卡
public int ComChest(int currentCell){
int card = generator.nextInt(16); //一共16张
switch(card)
{
case 1:currentCell = go; break;
case 2:currentCell = jail; break;
default : break;//题目说其他卡片无视效果
}
return currentCell;
}
/*
* 机会卡 (10/16 张卡):
回到起点“GO”
进入监狱“JAIL”
移动到“C1”
移动到“E3”
移动到“H2”
移动到“R1”
移动到下一个“R”（铁路公司）
移动到下一个“R”
移动到下一个“U”（公共服务公司）
后退三步
*/
//抽机会卡
public int Chance(int currentCell){
int card = generator.nextInt(16);
switch(card){
case 1: currentCell = go; break; //go
case 2: currentCell = jail; break; //jail
case 3: currentCell = 11; break; //c1
case 4: currentCell = 24; break; //e3
case 5: currentCell = 39;break; //h2
case 6: currentCell = 5; break; //r1
case 7: currentCell = nextRR(currentCell); break; //next railway
case 8: currentCell = nextRR(currentCell); break; //next railway
case 9: currentCell = nextUtil(currentCell); break; //next utility
case 10: currentCell = back3Squares(currentCell); break; //back 3 squares
default:break; //其他无效果，不变
}
return currentCell;
}
//移动到下一个“U”（公共服务公司）
public int nextUtil(int currentCell)
{
if(currentCell >= 12 && currentCell < 28)
{
return 28;
}
else
{
return 12;
}
}
//移动到下一个“R”
public int nextRR(int currentCell){
if(currentCell >= 35 || currentCell < 5)
{
return 5;
}
else if(currentCell >= 5 && currentCell < 15)
{
return 15;
}
else if(currentCell >= 15 && currentCell < 25)
{
return 25;
}
else
{
return 35;
}

}
//后退三步
//注意:特殊情况
public int back3Squares(int currentCell){
if(currentCell == 2){
return 39;
}
//特殊情况
else if(currentCell == ch3){
return ComChest(currentCell);
}
else
{
return currentCell - 3;
}
}

}
101524
114ms