Что думаешь? Оцени!
Witkus offered to show him to where other laborers were working, and the man thanked him. Witkus led him to a passageway whose windowed doors, on either end, could be locked remotely. He instructed the man to proceed to the far door. Once the man was inside, Witkus slipped back out and radioed officers in the master control room, telling them to keep the doors locked, then radioed Dial and Conrad. The police were called as Conrad raced to the passageway, arriving as the man was trying to open the far door.。关于这个话题，PDF资料提供了深入分析
* @param arr 待排序数组，这一点在PDF资料中也有详细论述
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