have no ideas. am i reading correctly?

    char buf[128];
    while (scanf("%s", buf)!=-1)
    {
        call = string(buf);
        if (call=="-1") break;
                ...
        }


Edited by author 18.03.2009 03:00

Please... because TLE#1 using dp is something unreal

ooh, finally i've solved it!!

thanks everyone for replying)