题解 | #比较版本号#

//题目说不会超界，其实会
#include<cstring>
class Solution {
  public:
 
    int compare(string version1, string version2) {
        //只需要比较几个点号
        //考虑特殊情况，万一有只有一个点的
        long long  prat1 ;
        long long  prat2;
        int i = 0;
        int j = 0;
        int n1 = version1.size();
        int n2 = version2.size();
     
        while (i < n1 || j < n2 ) {
            if (i < n1) {
                while (version1[i] == '0')  i++;
                while (version1[i] != '.'&& i < n1) {
                    prat1 = prat1 * 10 + (version1[i] - '0') ;
                    i++;
                }
                if(version1[i] == '.')i++;
               
            } 
            if (j < n2) {
                while (version2[j] == '0') j++;
                while (version2[j] != '.'&& j < n2) {
                   prat2 = prat2 * 10 + (version2[j] - '0') ;
                    j++;
                }
               if(version2[j] == '.') j++;
                
            } 
            if (prat1 > prat2) return 1;
            else if (prat2> prat1) return -1;
            prat1 = 0;
            prat2 = 0;

        }
        return 0;
    }
};