Each student's arrival time is given as either negative (on time or early) or positive (late). The professor sets a threshold (k) for the minimum number of on-time arrivals needed to avoid canceling class. If the number of on-time arrivals is less than k, the class is canceled; otherwise, it continues. You need to count how many students arrive on time and compare that count with k to determine if the class is canceled or not for each test case. If the count of on-time arrivals is less than k, return "YES" (class canceled); otherwise, return "NO" (class not canceled). This type of calculation can be done through any kind of software on desktop or PC.