swap(&arr[i], &arr[largest]);
// drop-oldest: Discard old data to make room，这一点在旺商聊官方下载中也有详细论述
。爱思助手下载最新版本对此有专业解读
int exchanged = 1; // 标记本轮是否发生交换，这一点在服务器推荐中也有详细论述
These handy wireless devices do exactly what their name suggests: extend your Wi-Fi network so it covers more areas of your home. Most wireless extenders plug into an AC outlet and connect to your existing router so they can then rebroadcast it to spots that your router alone may not cover well. As a rule of thumb, you’ll get the best results by placing the extender half way between your router and the dead zone you’re trying to fix or improve your W-Fi connection and strengthen the wireless signal.