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  • leetcode 13 Roman to Integer

    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;
        }
    };
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  • 原文地址:https://www.cnblogs.com/wangkun1993/p/6366635.html
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