方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
Let's start by being realistic. If, on average, about 15-22 watts of energy falls on every square foot of Earth (which works out to 0.104-0.153 watts per square inch), the amount of energy a panel that can fit onto a power bank can collect is proportionally smaller. A panel like this isn't going to collect buckets of energy, it's more like thimblefuls.
，这一点在谷歌浏览器【最新下载地址】中也有详细论述
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Rhea Seehorn, Pluribus