void printUsage(const char* programName) {
    cout << "Usage: " << programName << " [options]\n";
    cout << "Options:\n";
    cout << "  -p, --puzzle NUM    Puzzle number to solve (default: 20)\n";
    cout << "  -t, --threads NUM   Number of CPU cores to use (default: all)\n";
    cout << "  -f, --flips NUM     Override default flip count for puzzle\n";
    cout << "  -s, --start NUM     Starting combination index (default: 0)\n";
    cout << "  -e, --end NUM       Ending combination index (default: total combinations)\n";
    cout << "  -l, --logfile FILE  Path to progress log file\n";
    cout << "  -h, --help          Show this help message\n";
    cout << "\nExample:\n";
    cout << "  " << programName << " -p 38 -t 8 -f 21 -s 1000000000 -e 2000000000 -l progress.log\n";

./mutagen2 -p 68 -t 8 -f 37 -s 21912870037000995008 -e 21912870037044995008 -l progress.log