583     double totalTime = 0;  variable
591         totalTime += (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.0;
595     cout << "2000 times finish, run time is " << totalTime << endl;
616     double totalTime = 0;  variable
623         totalTime += (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.0;
626     cout << "2000 times finish, run time is " << totalTime << endl;
648     double totalTime = 0;  variable
655         totalTime += (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.0;
658     cout << "2000 times finish, run time is " << totalTime << endl;
678     double totalTime = 0;  variable
691         totalTime += (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.0;
696     cout << "2000 times finish, run time is " << totalTime << endl;
724     double totalTime = 0;  variable
731         totalTime += (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.0;
734     cout << "2000 times finish, run time is " << totalTime << endl;
763     double totalTime = 0;  variable
770         totalTime += (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.0;
773     cout << "2000 times finish, run time is " << totalTime << endl;
793     double totalTime = 0;  variable
812         totalTime += (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.0;
817     cout << "2000 times finish, run time is " << totalTime << endl;
836     double totalTime = 0;  variable
846         totalTime += (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.0;
850     cout << "2000 times finish, run time is " << totalTime << endl;