题解 | #比较版本号#

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) {
        // write code here
        int p1=0;
        int p2=0;
        int len1=version1.size();
        int len2=version2.size();
        while(p1<len1||p2<len2){
            long long num1=0;
            long long num2=0;
            while(p1<len1&&version1[p1]!='.'){
                num1=num1*10+(version1[p1]-'0');
                ++p1;
            }
            ++p1;
            while(p2<len2&&version2[p2]!='.'){
                num2=num2*10+(version2[p2]-'0');
                ++p2;
            }
            ++p2;
            if(num1>num2){
                return 1;
            }
            else if (num1<num2)return -1;
        }
        return 0;
    }
};