// ⚠️ 易错点2：循环条件写left <= n-1（会导致left+1越界），或把<=写成<（漏判相等的有序情况）
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Annual energy bills will fall by £117 for millions of households from April after Rachel Reeves’s plan to cut £150 a year from bills was partly foiled by rising costs.
// 5. 返回当日跨度（而非整个结果数组）