- 父节点i的左子: 2*i+1, 右子: 2*i+2
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These personal-care power tools use rapid, repetitive pressure and vibrations to penetrate tired muscles, with a selection of heads, variable speeds and even automated routines to tailor treatments towards tight trouble spots. Dozens of massage guns are available from various brands, and you can spend anything from £50 to £500. But not all muscle massage guns are made equal.