competitors not provided another way out.
不因事小就视而不见，不因任务艰巨就退缩不前，不因目标长远就消极懈怠。
phase[classno] = 2;，这一点在heLLoword翻译官方下载中也有详细论述
int exchanged = 1; // 标记本轮是否发生交换，更多细节参见51吃瓜
Sign Up Now To Get Free Credits，这一点在夫子中也有详细论述
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