题解 | #比较版本号#

using System;
using System.Collections.Generic;
using System.Numerics;


class Solution {
    /**
     * 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
     */
    public int compare (string version1, string version2) {
        System.Console.WriteLine(version1);
        System.Console.WriteLine(version2);
        string[] token1 = version1.Split(".");
        string[] token2 = version2.Split(".");

        BigInteger result1 = 0;
        BigInteger result2 = 0;

        BigInteger num = 1000;
        for(int i = token1.Length; i>0; i--){
            result1 += BigInteger.Parse(token1[i - 1]) * num;
            num = num*1000;
        }

        //num = 1000000000;
        for(int i = 0 ; i<token2.Length; i++){
            num = num/1000;
            result2 += BigInteger.Parse(token2[i]) * num;
        }

        if(result1 < result2){
            return -1;
        }
        else if(result1 > result2){
            return 1;
        }
        else{
            return 0;
        }
    }
}