When I was trying 5B, I get runtime error at the first time. I was frustrated since it works well in my computer. After observing the output from the judge, I suspected that there may be problem somewhere around the input handling part. So I re-wrote that part.

Original:

    int max = 0, i = 0, n;
    string in[1000];
    while(getline(cin, in[i])){
        if(in[i].size()>max)max = in[i].size();
        i++;
    }

Second version:

    int max = 0, i = 0, n;
    string in[1000];
    string tmp;
    while(getline(cin, tmp)){
        if(tmp.size()>max)max = tmp.size();
        in[i] = tmp;
        i++;
    }

It is accepted and I have no idea why....