An easy and clear c++ solution with 10 lines and 0ms

  • 0
    int compareVersion(string version1, string version2) {
        int i=0,j=0;
            int v1=0,v2=0;
            while(i<version1.size()&&version1[i]!='.') v1=v1*10+version1[i++]-'0';
            while(j<version2.size()&&version2[j]!='.') v2=v2*10+version2[j++]-'0';
            if(v1>v2) return 1;
            if(v1<v2) return -1;
        return 0;

  • 1

    I think there is an exception case.
    string p("9999999999999999999999999999999999");
    string q("9999999999999999999999999999");
    cout << compareVersion(p, q) << endl;

    result is -1. But the expect result should be 1.

    I think if we use multiply method, we should consider overflow issue.

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