disappears when extract returns.
// 易错点2：判断条件必须是<=，而非<（相等元素也无法作为「更大值」，需弹出）
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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.
// 易错点4：仅处理栈非空的情况，忽略栈空的情况 → 栈空时res[i]会是undefined