Roman to Integer

Given a roman numeral, convert it to an integer.

Input is guaranteed to be within the range from 1 to 3999.
这个和之前的相比就是倒序一下

  public int romanToInt(String s) {
        int result = 0;
        if(s != null && s.length()>0){
/*        String[] ge = {"I", "II","III", "IV","V","VI","VII", "VIII","IX"};
        String[] hen = {"X","XX","XXX","XL","L","LX","LXX","LXXX","XC"};
        String[] he = {"C","CC","CCC","CD", "D","DC","DCC","DCCC","CM"};
        String[] thr = {"M","MM","MMM"};*/
        HashMap<Character,Integer> hm = new  HashMap<Character,Integer>();
       
        hm.put('I', 1);
        hm.put('V', 5);
        hm.put('X', 10);
        hm.put('L', 50);
        hm.put('C', 100);
        hm.put('D', 500);
        hm.put('M', 1000);
        int len = s.length();
        for(int i = 0 ;i<len;i++){
        	int temp = hm.get(s.charAt(0));
        	if(s.charAt(0)== 'I'){
        		temp = (s.contains("V")||s.contains("X"))?-temp:temp;
        	}else if(s.charAt(0) == 'X'){
        		temp = (s.contains("L")||s.contains("C"))?-temp:temp;
        	}else if(s.charAt(0) == 'C'){
        		temp = (s.contains("D")||s.contains("M"))?-temp:temp;
        	}
        	s = s.substring(1);
        	result += temp;
        	
        	
        }
        }
        return result;
      
        }