leetcode 13 Roman to Integer

代码语言：javascript复制

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

integer leetcode

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