题解 | #比较版本号# 这题有点意思

class Solution {
public:
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 比较版本号
     * @param version1 string字符串 
     * @param version2 string字符串 
     * @return int整型
     */
    int compare(string version1, string version2) {
        int len1 = version1.size(), len2 = version2.size();
        int len1Index = 0, len2Index = 0, v1Num = 0, v2Num = 0;
        while (len1Index < len1 || len2Index < len2) {
            v1Num = 0, v2Num = 0;
            while(version1[len1Index] != '.' && len1Index < len1) {
                v1Num *= 10;
                v1Num += version1[len1Index] - '0';
                len1Index++;
            }
            while(version2[len2Index] != '.' && len2Index < len2) {
                v2Num *= 10;
                v2Num += version2[len2Index] - '0';
                len2Index++;
            }
            if (v1Num > v2Num) {
                return 1;
            } else if (v1Num < v2Num) {
                return -1;
            }
            len1Index++, len2Index++;
        }
        return 0;
        // write code here
    }
};