（二）主动消除或者减轻违法后果的；
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。关于这个话题，Line官方版本下载提供了深入分析
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The twelve-factor app told us to put config in the environment. Good advice. But .env files are a leaky implementation of that principle. They’re plaintext files pretending to be environment variables.
swap(&arr[0], &arr[i]); // 堆顶(最大)换到末尾