记录编号	166184	评测结果	AAAAA
题目名称	[NOIP 2000PJ]计算器的改良	最终得分	100
用户昵称	<蒟蒻>我要喝豆奶	是否通过	通过
代码语言	C++	运行时间	0.001 s
提交时间	2015-06-14 15:04:57	内存使用	0.32 MiB

#include<iostream>
#include<queue>
#include<cstring>
#include<cmath>
#include<cstdlib>
#include<cstdio>
using namespace std;
queue<int> unpos;//未知数位置
queue<int> coe;//未知数系数
queue<int> con;//常数项
queue<int> copos;//常数位置
int pos;
string s;
char x;
int main()
{
	freopen("computer.in","r",stdin);
	freopen("computer.out","w",stdout);
	cin>>s;
	s=' '+s+' ';
	for(int i=1;i<=s.size()-1;i++)
	{
		if(s[i]=='=')
			pos=i;
		if(s[i]>=97)
		{
			x=s[i];
			unpos.push(i);
			int temp=i;
			int ch=0;
			while(1)
			{
				if(s[temp-1]==' '||s[temp-1]=='-'||s[temp-1]=='+'||s[temp-1]=='=')
					break;
				ch++;
				temp--;
			}
			if(ch==0)
			 coe.push(1);
			else
			{
				string s2=s.substr(temp,ch);
				int data=0;
				for(int j=0;j<=s2.size()-1;j++)
						data+=pow(10,s2.size()-j-1)*(s2[j]-48);
				if(s[temp-1]=='-')
					coe.push(-1*data);
				else
					coe.push(data);
			}
		}
		if(s[i]>=48&&s[i]<=57&&(s[i+1]=='-'||s[i+1]=='+'||s[i+1]=='='||s[i+1]==' '))
		{
			copos.push(i);
			int temp=i;
			int ch=1;
			while(1)
			{
				if(s[temp-1]==' '||s[temp-1]=='-'||s[temp-1]=='+'||s[temp-1]=='=')
					break;
				ch++;
				temp--;
			}
			string s2=s.substr(temp,ch);
			int data=0;
			for(int j=0;j<=s2.size()-1;j++)
				data+=pow(10,s2.size()-j-1)*(s2[j]-48);
			if(s[temp-1]=='-')
				con.push(-1*data);
			else
				con.push(data);
		}
	}
	int left=0;
	int right=0;
	while(!unpos.empty())
	{
		int unposs=unpos.front();
		int coee=coe.front();
	//	cout<<"unposs "<<unposs<<"coee "<<coee<<endl;
		if(unposs>pos)
			right+=-1*coee;
		else
		    right+=coee;
		unpos.pop();
		coe.pop();
	}
	while(!copos.empty())
	{
		int coposs=copos.front();
		int conn=con.front();
		//cout<<"coposs "<<coposs<<"conn "<<conn<<endl;
		if(coposs>pos)
		    left+=conn;
		else
		    left+=-1*conn;
		copos.pop();
		con.pop();
	}
	//cout<<right<<" "<<left<<endl;
	double zuo=right;
	double  you=left;
	cout<<x<<"=";
	printf("%.3f",you/zuo);
//	system("pause");
	return 0;
}