Жители Санкт-Петербурга устроили «крысогон»17:52
输出：[4,2,4,-1,4]（最后一个 3 绕一圈找到 4）
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This technique is more deeply rooted. Choosing wrong datatypes, or casting without care leaves you open to attacks. Whenever you cast some data structure to another one by “removing” information, such attacks can happen:
HH x C++ Fast RoutingTraditional Routing A*2-phaseCalculation time: 13 secCalculation time: 36 sec