int n2 = right - mid; // 右子数组长度
Author(s): Zhiyuan Huang, Lidong Ma, Jianbao Zhang, Dongpeng Hua, Qing Zhou, Lei Yang, Ji-Jung Kai, Haifeng Wang
，这一点在爱思助手下载最新版本中也有详细论述
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for (int i = 0; i <= max; i++) {