有一个南北向的桥，只能容纳一个人，现桥的两边分别有10人和12人，编制一个多线程程序让这些人到达对岸，每个人用一个线程表示，桥为共享资源-A north-south bridge can only accommodate one person, on both sides of the bridge is now 10 and 12 respectively, the preparation of a multi-threaded program to allow these people to reach the other side, each with a thread that the bridge is a shared resource