Walmart has agreed to pay $100m (£74.1m) to settle claims that it misled gig workers who signed up to deliver packages for the company about the pay and tips they would receive.
记住这个「条件对应法则」，同类题都能快速确定弹出条件，不会写反。
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优化：随机选基准避免最坏情况 O(n²)