POJ 2121 Inglish-Number Translator

1. Negative numbers will be preceded by the word negative. 
   
2. The word "hundred" is not used when "thousand" could be. For example, 1500 is written "one thousand five hundred", not "fifteen hundred".

#include<iostream>
#include<string> 
#include<map>
using namespace std;
int main()
{
//建立英文数字对应关系 
map<string ,long long > map1;
map1["one"]=1; 
map1["negative"]=-1;
map1["two"]=2;
map1["three"]=3;
map1["four"]=4;
map1["five"]=5; 
map1["six"]=6;
map1["seven"]=7;
map1["eight"]=8;
map1["nine"]=9;
map1["ten"]=10;
map1["eleven"]=11;
map1["twelve"]=12;
map1["thirteen"]=13;
map1["fourteen"]=14;
map1["fifteen"]=15;
map1["sixteen"]=16;
map1["seventeen"]=17;
map1["eighteen"]=18;
map1["nineteen"]=19;
map1["twenty"]=20;
map1["thirty"]=30;
map1["forty"]=40;
map1["fifty"]=50;
map1["sixty"]=60;
map1["seventy"]=70;
map1["eighty"]=80;
map1["ninety"]=90;
map1["hundred"]=100;
map1["thousand"]=1000;
map1["million"]=1000000;
long long temp,now,r;
string str,num;
while(getline(cin,str))
{
  	if(str=="")     //输入为空则终止 
  	break;  
	//sign 表示符号,r存放结果,now为当前值   
  	long long sign=1,temp=0,r=0,now=0;
	//start和substr配合用于截取数字 
    long long pos=0,start=0;
  	long long L=str.size();
  	for(long long i=start;i<=L;i++)
  	{
  		if(str[i]==‘ ‘||i==L)
  		{
  			num=str.substr(start,i-start);
  			now=map1[num];
  			if(now==-1)
  			sign=now;
  			else 
			{
  			if(now>0&&now<100)
  			 temp+=now;
  			else
  			{
			   if(now==100)
			   temp*=100;
			   else 
			   {
			   	r+=temp*now;
			   	temp=0;
			   } 
  			}	
  			}
			start=i+1;
  		}
  	}
  	r+=temp;
  	cout<<sign*r<<endl;
}
  return 0;
}