As the spacecraft re-emerged from the darkness, Lovell was first to announce the good news. "Please be advised," he said as the radio crackled back into life, "there is a Santa Claus."
* 时间复杂度: O(n²) 最好: O(n) 空间复杂度: O(1) 稳定: ✓
，这一点在爱思助手下载最新版本中也有详细论述
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