Leetcode 13 Roman to Integer

Given a roman numeral, convert it to an integer.

Input is guaranteed to be within the range from 1 to 3999.

和12正好相反，理解转换规则，打一个表就行了

代码语言：javascript复制

class Solution {
public:
    int romanToInt(string s) {
        map<char,int> mp;
        mp['I']=1;
        mp['V']=5;
        mp['X']=10;
        mp['L']=50;
        mp['C']=100;
        mp['D']=500;
        mp['M']=1000;
        int result=0,pre=0;
        for(int i=0;i<s.length();i  )
        {
            if(mp[s[i]]>pre)
                result =mp[s[i]]-2*pre;
            else
                result =mp[s[i]];
            pre=mp[s[i]];
        }
        return result;
    }
};

input integer range

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