Leigh Greer, head of market regulation at the Utility Regulator said it would continue to monitor the regulated tariffs to make sure any further falls in costs are passed through to customers.
// 易错点3：忘记stack.length判断 → 访问stack[-1]会报错
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"message": "Amount must be non-zero."，详情可参考91视频
if (n <= 1) return n;