// 易错点3：处理最终结果为空的场景（比如num="10"，k=2）
Алевтина Запольская (редактор отдела «Бывший СССР»)
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ОАЭ задумались об атаке на Иран20:55
Now, let's come back to that solar panel. According to the specs, the 280mA panel can harvest 1A of power every 3.57 hours. In theory, it could fully charge the power bank in 57 hours of sunlight. Is this a practical way to charge the power bank for daily use? No. But it does provide a way to collect power in an emergency, which can be used to top up a phone or other device.