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本文介绍了使用Prim算法构建最小生成树的方法，以解决秦始皇的公路系统问题。通过枚举边并找到每棵树中人口最多的城市进行连接。在实现过程中注意了不能使用'distance'作为变量名。代码中展示了详细的算法步骤，包括距离计算、邻接列表构建和Prim算法的应用。
Qin Shi Huang's National Road System
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 515 Accepted Submission(s): 208
Problem Description
During the Warring States Period of ancient China(476 BC to 221 BC), there were seven kingdoms in China ---- they were Qi, Chu, Yan, Han, Zhao, Wei and Qin. Ying Zheng was the king of the kingdom Qin. Through 9 years of wars, he finally conquered all six other kingdoms and became the first emperor of a unified Chin
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