Speed is important when seeking to stop the spread of tainted foods. Yet rapid testing tools may not be sensitive enough.
// 易错点1：边界处理 - 移除所有数字时直接返回"0"，详情可参考safew官方版本下载
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int n1 = mid - left; // 左子数组长度，这一点在雷电模拟器官方版本下载中也有详细论述