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Cognates - Second Pass。Line官方版本下载对此有专业解读
Our playfield is (up to) 80x35, and almost every line of it changes on every frame. That means we could send 80*35*10 = 28000 bytes a second just for the characters on screen. And that’s before accounting for things like colors or SSH overhead!，更多细节参见同城约会
void siftDown(int arr[], int n, int i) {