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namespace {
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namespace {
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/// Version number. If Version is left empty, then compile date in the format
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/// Version number. If Version is left empty, then compile date in the format
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/// DD-MM-YY and show in engine_info.
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/// DD-MM-YY and show in engine_info.
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const string Version = "";
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const string Version = "8";
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/// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
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/// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
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/// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
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/// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
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/// can toggle the logging of std::cout and std:cin at runtime whilst preserving
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/// can toggle the logging of std::cout and std:cin at runtime whilst preserving
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/// usual I/O functionality, all without changing a single line of code!
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/// usual I/O functionality, all without changing a single line of code!
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};
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};
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class Logger {
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class Logger {
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  Logger() : in(cin.rdbuf(), file.rdbuf()), out(cout.rdbuf(), file.rdbuf()) {}
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  Logger() : in(cin.rdbuf(), file.rdbuf()), out(cout.rdbuf(), file.rdbuf()) {}
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 ~Logger() { start(false); }
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 ~Logger() { start(""); }
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  ofstream file;
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  ofstream file;
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  Tie in, out;
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  Tie in, out;
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public:
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public:
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  static void start(bool b) {
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  static void start(const std::string& fname) {
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    static Logger l;
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    static Logger l;
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    if (b && !l.file.is_open())
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    if (!fname.empty() && !l.file.is_open())
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    {
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    {
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        l.file.open("io_log.txt", ifstream::out);
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        l.file.open(fname, ifstream::out);
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        cin.rdbuf(&l.in);
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        cin.rdbuf(&l.in);
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        cout.rdbuf(&l.out);
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        cout.rdbuf(&l.out);
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    }
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    }
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    else if (!b && l.file.is_open())
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    else if (fname.empty() && l.file.is_open())
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    {
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    {
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        cout.rdbuf(l.out.buf);
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        cout.rdbuf(l.out.buf);
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        cin.rdbuf(l.in.buf);
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        cin.rdbuf(l.in.buf);
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        l.file.close();
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        l.file.close();
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    }
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    }
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  return os;
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  return os;
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}
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}
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/// Trampoline helper to avoid moving Logger to misc.h
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/// Trampoline helper to avoid moving Logger to misc.h
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void start_logger(bool b) { Logger::start(b); }
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void start_logger(const std::string& fname) { Logger::start(fname); }
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/// prefetch() preloads the given address in L1/L2 cache. This is a non-blocking
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/// prefetch() preloads the given address in L1/L2 cache. This is a non-blocking
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/// function that doesn't stall the CPU waiting for data to be loaded from memory,
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/// function that doesn't stall the CPU waiting for data to be loaded from memory,
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/// which can be quite slow.
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/// which can be quite slow.