罗马数字转换 https://leetcode-cn.com/problems/roman-to-integer

ExportReportEastSunService.java

    public static int romanToInt(String s) {
        int[] numArray = new int[26];
        numArray['I' - 'A'] = 1;
        numArray['V' - 'A'] = 5;
        numArray['X' - 'A'] = 10;
        numArray['L' - 'A'] = 50;
        numArray['C' - 'A'] = 100;
        numArray['D' - 'A'] = 500;
        numArray['M' - 'A'] = 1000;

        int pre = 0;
        int current;
        int result = 0;
        char[] charArray = s.toCharArray();
        for (char str : charArray) {
            current = numArray[str - 'A'];

            if (pre > 0 && pre < current) {
                result = result - pre - pre;
            }

            pre = current;

            result = result + current;
        }

        return result;
    }