int pivot = arr[low]; // 基准值
Annabel RackhamCulture reporter
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You probably already know that falling asleep in a funky position can leave you feeling sore the next morning, but your sleeping position can reflect your overall health and even your ability to breathe easily at night. Luckily, you can optimize your sleep posture by making small adjustments to support your spine and neck, open your airways, and help you wake up feeling well-rested.