LeetCode/LeetCode-13.cpp at master · hello-sources/LeetCode · GitHub

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/*************************************************************************
    > File Name: LeetCode-13.cpp
    > Author: ltw
    > Mail: 3245849061@qq.com
    > Created Time: Tue 19 May 2020 08:13:22 PM CST
 ************************************************************************/

#include <iostream>
using namespace std;


class Solution {
public:
    int getVal(char c) {
        switch (c) {
            case 'I' : return 1;
            case 'V' : return 5;
            case 'X' : return 10;
            case 'L' : return 50;
            case 'C' : return 100;
            case 'D' : return 500;
            case 'M' : return 1000;
        }
        return 0;
    }
    int romanToInt(string s) {
        int num = 0;
        for (int i = 0; s[i]; i++) {
            if (s[i + 1] == 0 || getVal(s[i]) >= getVal(s[i + 1])) {
                num += getVal(s[i]);
            } else {
                num -= getVal(s[i]);
            }
        }
        return num;
    }
};