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The sun is a giant nuclear fusion reactor, converting hydrogen into helium and releasing massive amounts of energy in the form of heat – and sound. Sound is essentially vibration and needs a medium to travel through.
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* 时间O(n) 空间O(n)（理论最优，无冗余计算/存储）
There may still be snow on the ground outside, but spring is only a few short weeks away. That means camping season is just around the corner. You can prepare yourself for those off-grid adventures to come by snagging a portable power station. Better yet, you can save some money by thinking ahead.
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