Марина Совина (ночной редактор)
siftDown(arr, i, 0); // 对剩余i个元素重新建堆，详情可参考夫子
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NASA leaders argued that it makes more sense to uncover problems and practice operations close to home, in Earth orbit, rather than discovering them for the first time while attempting a landing on the moon. If the faster launch tempo holds, Artemis IV and Artemis V together could give NASA two opportunities in 2028. Officials stressed that the timeline still depends on hardware readiness and safety reviews.