上机笔试题3及程序源码_font-family: initial !important;

扑克牌游戏大家应该都比较熟悉了，一副牌由54张组成，含3~A，2各4张，小王1张，大王1张。牌面从小到大用如下字符和字符串表示（其中，小写joker表示小王，大写JOKER表示大王）:) 
3 4 5 6 7 8 9 10 J Q K A 2 joker JOKER 
输入两手牌，两手牌之间用“-”连接，每手牌的每张牌以空格分隔，“-”两边没有空格，如：4 4 4 4-joker JOKER
请比较两手牌大小，输出较大的牌，如果不存在比较关系则输出ERROR

基本规则：
（1）输入每手牌可能是个子，对子，顺子（连续5张），三个，炸弹（四个）和对王中的一种，不存在其他情况，由输入保证两手牌都是合法的，顺子已经从小到大排列；
（2）除了炸弹和对王可以和所有牌比较之外，其他类型的牌只能跟相同类型的存在比较关系（如，对子跟对子比较，三个跟三个比较），不考虑拆牌情况（如：将对子拆分成个子）
（3）大小规则跟大家平时了解的常见规则相同，个子，对子，三个比较牌面大小；顺子比较最小牌大小；炸弹大于前面所有的牌，炸弹之间比较牌面大小；对王是最大的牌；
（4）输入的两手牌不会出现相等的情况。

答案提示：
（1）除了炸弹和对王之外，其他必须同类型比较。
（2）输入已经保证合法性，不用检查输入是否是合法的牌。

（3）输入的顺子已经经过从小到大排序，因此不用再排序了.

本题需要解决同类型手牌的大小比较和不同类型手牌判断4张相同牌组成的炸弹和2张joker组成的王炸。对比优秀代码可以发现，本文在string类中find、substr、npos等运用上欠缺，此外，在判断手牌牌面大小是采用switch语句相比字符串find方法略显繁琐，这是需要改进和学习的地方，具体的程序源码如下所示：

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
using namespace std;
int encode(char a)
{
	int c=-1;
	switch(a)
	{
	case '1': 
		c=10;
		break;
	case 'J':
		c=11;
		break;
	case 'Q':
		c=12;
		break;
	case 'K':
		c=13;
		break;
	case 'A':
		c=14;
		break;
	case '2':
		c=15;
		break;
	case 'j':
		c=16;
		break;
	default:
		c=a-'0';
		break;
	}
	return c;
}
bool compare(char a,char b)
{
	int c=encode(a);
	int d=encode(b);
	return c>d;
	
}
int cardsize(string str)
{
	int pos=0;
	int i=0;
	int count=1;
	while((pos=str.find(' ',i))!=string::npos)
	{
		i=pos+1;
		count++;
	}
	return count;
}
int main()
{
	string input,first,second,result;
	getline(cin,input);
		int position=input.find('-');
		first=input.substr(0,position);
		second=input.substr(position+1);
		int firstsize=cardsize(first);
		int secondsize=cardsize(second);
		if(firstsize==secondsize)//若两者属于相同的长度
		{
			if(first=="JOKER"||second=="JOKER")
			{
				cout<<"JOKER"<<endl;
				return 0;
			}
			else if(first=="JOKER joker"||second=="JOKER joker")
			{
				cout<<"JOKER joker"<<endl;
				return 0;
			}
			else
				NULL;
			char a=first.at(0);
			char b=second.at(0);
			if(compare(a,b))//若a大于b
			{
				result=first;
			}
			else
			{
				result=second;
			}
		}
		else//若两者长度不同,取炸弹和王炸作为最大值
		{
			if(first=="JOKER joker"||first=="joker JOKER")
			{
				result=first;
			}
			else if(second=="JOKER joker"||second=="joker JOKER")
			{
				result=second;
			}
			else if(cardsize(first)==4)
			{
				result=first;
			}
			else if(cardsize(second)==4)
			{
				result=second;
			}
			else
				result="ERROR";
		}
	cout<<result<<endl;
	return 0;
}

附加优秀程序源码：

<div class="line number1 index0 alt2" style="line-height: 18px; font-family: Monaco, Menlo, Consolas, 'Courier New', monospace; font-size: 13px; color: rgb(102, 102, 102); white-space: pre !important; border-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; margin: 0px !important; outline: 0px !important; overflow: visible !important; padding: 0px 1em !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; min-height: auto !important; background-image: none !important; background-attachment: initial !important; background-size: initial !important; background-origin: initial !important; background-clip: initial !important; background-position: initial !important; background-repeat: initial !important;"><code class="cpp preprocessor" style="white-space: nowrap; word-wrap: break-word; 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