Leetcode 13 Roman to Integer
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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
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; }}; 0 0
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